Journal articles on the topic 'Surveying Triangulation'

The key technologies in the real scene 3D modeling of oblique photography mainly include the data acquisition of oblique photography, layout and surveying of photo control points, oblique camera calibration, aerial triangulation, dense matching of multi-angle image, building of triangulation irregular network (TIN) and TIN simplification and automatic texture mapping, among which aerial triangulation is the core and the results of aerial triangulation directly affect the later model effect and the corresponding data accuracy. Starting from this point of view, this paper aims to study the practical technologies of aerial triangulation for real scene 3D modeling with oblique photography and finally proposes a technical method of aerial triangulation with oblique photography which can be put into practice.

Industrial surveying is special field of work within engineering surveying. In this article we have documented some procedures and principles which are very special in industrial surveying. A micro-network consists of net points which are set as a base for all surveying in the industry. These points create coordinate system for all measured parts of the machine. For realization of micro-network are used well known geodetic methods such as triangulation, trilateration, levelling or trigonometric high. As horizontal and vertical controls do not exist in a factory hall, a surveyor has to find some different method to start working.

It is so valuable that models merging of Delaunay triangulation are used widely in many applications. This paper researches the algorithm of models merging for Delaunay triangulation. A method for obtaining merged intersection lines and a algorithm for searching fast triangles in the extent of merging intersection lines are proposed, and whole process of models merging are expatiated detailedly. The algorithm is tested in experiments, and the result of experiment shows that this algorithm is very efficient.

The authors present the results of certification testing software-and-hardware complex on the basis of an unmanned aircraft (UAV) “Geoskan 401”, designed for aerial mapping. The substantiation of the need to assess the accuracy characteristics of the photogrammetric processing aerial photos results from the UAV is given. The composition of the complex, the parameters of the test site and the performed aerial photography are given, the order and method of testing are described. Assessment of the aerial triangulation accuracy, creation of a digital elevation model, digital orthophotos and coordinates of marked and unmarked characteristic points (natural contours) of land boundaries and building contours were carried out to confirm the compliance with the requirements of regulatory documents for the implementation of photogrammetric processing, maintenance of the state real estate cadastre and surveying. The values of the spatial data accuracy obtained with the help of a hardware-and-software complex confirm the possibility of using the “Geoskan 401” in real estate cadastre and surveying. Recommendations on the use of hardware and software complex for cadastral and mine surveying works are given.

Topographic maps in digital and electronic forms are created on the basis of available paper topographic maps or on the basis of primary materials of geodetic surveys. Geodetic surveys are performed both by ground methods, without the use of photogrammetric materials, and on the basis of materials obtained as a result of ground phototheodolite or aerial photography. The construction of a digital terrain model is a multi-stage process, which consists of a significant number of interconnected operations performed at the stage of in-house processing of the results of geodetic measurements carried out during engineering and geodetic surveys. The quality of the final result of modeling depends on the quality of each stage of construction of a digital terrain model, so it is extremely important to pay attention to all technological processes of model construction. The digital relief model is considered as an ordered set of triangular faces constructed by the Delaunay algorithm. The main condition of this type of triangulation is that in the middle of the circle described around any triangle can not be the vertex of another triangle. Construction of a digital terrain model based on the results of geodetic surveying of the area in the general case can be divided into several stages. At the beginning, an automated construction of triangulation is performed on the basis of the results of geodetic measurements, which carry information about three-dimensional coordinates of survey points. Allotments adjust the display of horizontals. Regardless of the selected surface display style, the surface model is a grid of triangles. At the next stage of construction of the digital model of a relief carry out visual control of the created model and if necessary carry out editing of elements of a surface and change of position of edges of triangulation for change of position of horizontals. The last stage of building a digital terrain model based on the results of geodetic surveying of the area is the design of modeling results, the application of individual styles of reflection for individual areas of the surface and the creation of mountain strokes and signatures of horizontals.

Over the past five years or so three-dimensional coordinate measuring techniques traditionally associated with surveyors and photogrammetrists have gained a significant place in industrial metrology. Nowhere has this been more apparent than in the automobile, shipbuilding and aerospace manufacturing sectors in the U.S. From the outset, optical triangulation techniques such as digital theodolite systems and automated photogrammetry have been widely employed, but more recently laser trilateration and total station systems have found limited application. In this paper the present role of the surveying engineer in the burgeoning field of industrial measurement is discussed, and prospects for the future are considered. One question that arises regarding the use of surveying technologies in this new area is whether the services and expertise of the surveyor are being called upon at a rate commensurate with that at which the traditional “tools of his trade” are being applied. Although the paper centers on the scene in the U.S. there is reason to believe that trends there will also be witnessed in other countries of the industrialized world.

Abstract. Currently, digital elevation models (DEM) created by photogrammetric method based on unmanned aerial survey data are becoming an increasingly popular product. They are used in various areas of human activity related to modelling and analysis of terrain, namely: topography, engineering and geodetic surveys, surveying, archaeology, geomorphology, etc. The accuracy of digital surface and terrain models obtained by the photogrammetric method depends on the accuracy of aerial triangulation and dense point cloud from a number of overlapping images. In turn, the accuracy of the aerial triangulation is determined by the accuracy of the measurements of the tie points, GCP's / check points and the intersection geometry. When constructing a dense cloud using the SGM algorithm, the quality of the surface/terrain model depends not only on the accuracy of point identification, but also on filtering outliers and rejecting unreliable measurements. This article presents the results of evaluating the accuracy of creating a digital elevation model obtained by various unmanned aerial survey systems on a single test area.

The paper presents triangulation-based accuracy test procedures for PhotoScan 3D modelling software with automatic features including camera station identification, point cloud construction and the generation of polygon networks and polygon net textures. The process starts with establishing the camera resolutions. Then, internal orientation elements of the cameras are established by means of different calibration techniques and comparisons between them are made. 3D models are then tested using diverse model generation parameters and different configurations of sets of images including how each type of calibration affects the resulting 3D model accuracy. To conclude, 3D model accuracy is compared with geodesic surveying results.

ABSTRACT Background Residency programs and the Accreditation Council for Graduate Medical Education (ACGME) use survey data for the purpose of program evaluation. A priority for many programs is to improve resident wellness, often relying on self-reported surveys to drive interventions. Objective We tested for result differences on wellness surveys collected through varying survey methodology and identified potential causes for differences. Methods Aggregated results on the resident wellness scale for a single institution were compared when collected electronically through the ACGME Resident Survey immediately following the program evaluation survey for accreditation purposes and anonymously through an internal survey aimed at program improvement. Results Across 18 residency programs, 293 of 404 (73%) residents responded to the internal survey, and 383 of 398 residents (96%) responded to the 2018 ACGME survey. There was a significant difference (P < .001, Cohen's d = 1.22) between the composite wellness score from our internal survey (3.69 ± 0.34) compared to its measurement through the ACGME (4.08 ± 0.30), indicating reports of more positive wellness on the national accreditation survey. ACGME results were also statistically more favorable for all 10 individual scale items compared to the internal results. Conclusions Potential causes for differences in wellness scores between internal and ACGME collected surveys include poor test-retest reliability, nonresponse bias, coaching responses, social desirability bias, different modes for data collection, and differences in survey response options. Triangulation of data through multiple methodologies and tools may be one approach to accurately gauge resident wellness.

In the modern context of digital technology in the field of surveying and mapping, the technique of digital photogrammetry plays crucial role in all steps of mapping. There are some very expensive as well as low cost and free softwares are available in the market for professional photogrammetric work stations. The image triangulation and image matching is one of the very important steps of photogrammetry for which LPS as a commercial software is available in market. There are some low cost and free software as 123D Catch and Patch Boased Multi View Stereo Softwear (PMVS) also available. So, this paper mainly deals with the accuracy as well as the performance of those software for aerial triangulation and image matching for airborne image data to substitute commercial software for photogrammetric workstations. The accuracy assessment of image orientation, points cloud as well as DSM generated from those points cloud are also performed and compared with all products of LPS as commercial software. Nepalese Journal on Geoinformatics -12, 2070 (2013AD): 42-48

For use in glaciological research, between 1982 and 1984, we succeeded in surveying and mapping the Mount Gongga Glacier, on a scale of 1:25 000, by means of a combination of terrestrial and aerial photogrammetry. This paper describes the method in detail. In the survey area, we set up an independent, triangulation network, with microwave distance measurement, and two, independent, straight-line traverses, for basic control. Control points were observed by intersection. The terrestrial, photogrammetric baselines were projected and corrected into distances on the. plane of the map. Terrestrial photography accounted for the majority of the photographs of the survey area. Surveying and mapping of planimetrie and topographic features were completed on a stereo-autograph, using plates mainly from terrestrial photogrammetry. Where these data were insufficient, they were supplemented by aerial photography, plotted on a photographic plotting instrument. Orientation points of the aerial photographs were established by terrestrial, photogrammetric analysis and located on the map by an optical, mechanical method. The practical result showed that a combination of terrestrial and aerial photogrammetry, in mapping a high, mountain, glacier area, on a large scale, is more feasible and flexible than other methods and more economical as well.

For use in glaciological research, between 1982 and 1984, we succeeded in surveying and mapping the Mount Gongga Glacier, on a scale of 1:25 000, by means of a combination of terrestrial and aerial photogrammetry. This paper describes the method in detail.In the survey area, we set up an independent, triangulation network, with microwave distance measurement, and two, independent, straight-line traverses, for basic control. Control points were observed by intersection. The terrestrial, photogrammetric baselines were projected and corrected into distances on the. plane of the map.Terrestrial photography accounted for the majority of the photographs of the survey area. Surveying and mapping of planimetrie and topographic features were completed on a stereo-autograph, using plates mainly from terrestrial photogrammetry. Where these data were insufficient, they were supplemented by aerial photography, plotted on a photographic plotting instrument. Orientation points of the aerial photographs were established by terrestrial, photogrammetric analysis and located on the map by an optical, mechanical method.The practical result showed that a combination of terrestrial and aerial photogrammetry, in mapping a high, mountain, glacier area, on a large scale, is more feasible and flexible than other methods and more economical as well.

<p><strong>Abstract.</strong> The protection and management of archaeological sites require from a deep documentation and analysis, and although hand measuring and documentation is the cheapest way for collecting data, laser scanner has been gradually integrated for the geometrical data capture since point clouds have a high quality in terms of accuracy, precision and resolution. Although acquisition with laser scanner is considered a quick process, scan planning is of high relevance when considering outdoor archaeological sites because of their large size and complexity. In this paper, an automatic methodology to optimize the number and position of scans in order to obtain a point cloud of high quality in terms of data completeness is proposed. The aim of the methodology is to minimize the number of scans, minimizing at the same time the estimated surveying time and the amount of repetitive acquired data. Scan candidates are generated by using a grid-based and a triangulation-based distribution, and results show a faster analysis when triangulation is implemented. The methodology is tested into two real case studies from Italy and Spain, showing the applicability of scan planning in archaeological sites.</p>

The paper discusses the development of interview and focus group instruments to uncover the intuition occurrences in Designerly practices. The two data collecting method forms data source triangulation through in-depth interviews of eight experts and eight senior-level designers with four focus group sessions involving thirty-two novice-level designers. The instrument development took into consideration its reliability and validity for the triangulation analysis stage to follow. The result from four pilot interviews and one focus group discussion provides recommendation and refinement for the researcher’s guide as well as various data collection methods within the Design and Designerly research area. Keywords: Designerly, Intuition, Design Thinking, Research Instrumentation eISSN: 2398-4287© 2021. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians/Africans/Arabians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI: https://doi.org/10.21834/ebpj.v6iSI5.2925

Aerial photogrammetric block triangulation, a standard and well-developed technique for extending accurate control for mapping into the interior of a region from a few points of known position on its perimeter, can be readily adapted to determine surface velocities on bodies of ice which are too large, and often too crevassed, to be studied effectively by conventional ground surveying. Velocities are calculated from the changes in positions of the same natural surface features determined from photography of two (or more) epochs and the elapsed time. This method is capable of providing many uniformly-spaced measurements over the whole, moving, ice surface, thus allowing the production of maps of velocity and strain-rate, which are valuable in analyzing the ice-flow regime. Results from measurements completed some years ago on Byrd Glacier, one of the largest outlet glaciers from the East Antarctic plateau, are presented as an example of what the method can yield. By means of Doppler satellite surveying, relative positions of control points for each photography epoch can be determined with sub-meter accuracy, making the technique suitable also in regions where no fixed land features exist. A brief description of a project under way in such an area, on Ice Stream B in West Antarctica, is given.

Aerial photogrammetric block triangulation, a standard and well-developed technique for extending accurate control for mapping into the interior of a region from a few points of known position on its perimeter, can be readily adapted to determine surface velocities on bodies of ice which are too large, and often too crevassed, to be studied effectively by conventional ground surveying. Velocities are calculated from the changes in positions of the same natural surface features determined from photography of two (or more) epochs and the elapsed time. This method is capable of providing many uniformly-spaced measurements over the whole, moving, ice surface, thus allowing the production of maps of velocity and strain-rate, which are valuable in analyzing the ice-flow regime. Results from measurements completed some years ago on Byrd Glacier, one of the largest outlet glaciers from the East Antarctic plateau, are presented as an example of what the method can yield. By means of Doppler satellite surveying, relative positions of control points for each photography epoch can be determined with sub-meter accuracy, making the technique suitable also in regions where no fixed land features exist. A brief description of a project under way in such an area, on Ice Stream B in West Antarctica, is given.

The article explores the trinitarian systems used in the natural and technical sciences. Various types of trinitarian systems are considered. A systematic analysis of trinitarian systems was carried out. The article proves that the trinitarian system is the simplest complex system. The paper examines the relationship of trinitarian systems with the theory of categories. It is shown that the trinitarian system serves as the basis for categorical analysis. The paper proves that the trinitarian system is the simplest multigraph. The trinitarian system allows transforming spaces of different curvature into each other. The trinitarian system in linear systems defines a cyclicity, which can entail: development, degradation or bifurcation. Triangulation essentially develops a trinitarian approach and can be considered as the use of a trinitarian system to solve theoretical or technical problems in areas such as, for example, psychology, social sciences, politics, geometry, and ground surveying. The general conclusion is that the Trinitarian system is a universal instrument of cognition.

Objective: This study investigated the impact of GROW, an Australia-wide community mental health organisation, on psychological wellbeing and mental health. Design: Triangulation of quantitative and qualitative research methods was employed. The study included a cross-sectional and a longitudinal survey of GROW members together with ethnographic and phenomenological work. Research outcomes: The results pointed to length of membership/extent of involvement in GROW activities as being associated with improved wellbeing in the areas of autonomy, environmental mastery, personal growth, and selfacceptance/ purpose in life, together with a reduction in medication and hospitalisation. In a longitudinal study surveying the wellbeing of 28 new GROW members with 6-month follow-up, there were statistically significant improvements on all wellbeing factors. A major theme emerging from ethnographic and phenomenological research was that GROW offers a ?real life? mini-community where people learn social and life management skills. However, beyond skills acquisition, GROW offers the potential for identity transformation by assisting the realisation of core human needs ? a sense of feeling useful, valuable and belonging.

The purpose of this study is the photogrammetric survey of a forested area using unmanned aerial vehicles (UAV), and the estimation of the digital terrain model (DTM) of the area, based on the photogrammetrically produced digital surface model (DSM). Furthermore, through the classification of the height difference between a DSM and a DTM, a vegetation height model is estimated, and a vegetation type map is produced. Finally, the generated DTM was used in a hydrological analysis study to determine its suitability compared to the usage of the DSM. The selected study area was the forest of Seih-Sou (Thessaloniki). The DTM extraction methodology applies classification and filtering of point clouds, and aims to produce a surface model including only terrain points (DTM). The method yielded a DTM that functioned satisfactorily as a basis for the hydrological analysis. Also, by classifying the DSM–DTM difference, a vegetation height model was generated. For the photogrammetric survey, 495 aerial images were used, taken by a UAV from a height of ∼200 m. A total of 44 ground control points were measured with an accuracy of 5 cm. The accuracy of the aerial triangulation was approximately 13 cm. The produced dense point cloud, counted 146 593 725 points.

Tourism development aims to improve the living standards of the host community. Lumban Suhi-suhi tourist village, located at Pangururan sub-district in Samosir Island, is famous for its handcrafted ulos. However, inadequate tourism facilities regulation has made the area less attractive. Therefore, the concept of environment-based arrangement is proposed to be applied in the village to improve its facilities. The qualitative approach was carried out through observation and interviews. Triangulation method was carried out in analysing the collected data with relevant theories. The concept is eligible to increase visitors as well as to maintain environmental sustainability.Keywords: Tourism Village; Site Arrangement; Sustainable Tourism; Lumban Suhi-suhieISSN: 2398-4295 © 2019. The Authors. Published for AMER, ABRA & cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.DOI: http://dx.doi.org/10.21834/ajbes.v4i17.181

Purpose The purpose of this paper is to understand how funders and stakeholders influence the performance of Spain’s most autonomous cultural institutions. As the first of its kind to focus on Spain’s independent cultural spaces, the paper is exploratory in nature. It seeks to contribute to the field of research on best practices in cultural management and marketing through its study of the performance of all seven independent cultural spaces that belong to the Red TransIbérica de Espacios Culturales Independientes. Design/methodology/approach The paper employs a mixed-methods case study analysis. Relying on in-person observations and interviews, online surveying, online review analyses and cultural engagement data synthesis, it supports quantitative data with qualitative data, and uses methodological triangulation techniques to validate findings. Findings The paper indicates that despite their autonomy, the type of funding and the number of stakeholders that independent cultural spaces boast appear related to their marketability. Originality/value Using all seven member organizations as the sample group, this research is able to build generalized conclusions for the country’s population of independent cultural spaces. By highlighting key themes for further research, the paper offers insight into an understudied section of the sector.

AbstractThe paper highlights the cultural constructedness of vision in the early modern period by drawing on heteroglossic representations of the eye in early English texts, ranging from anatomy and physiology treatises to philosophy, poetry, emblems, and geometrical perspective in astronomy and land surveying. The argument is based on the association of word and image in early modern representations of space, mirrored in Ortelius’s notion of geography as the eye of history, which shows the importance of the visual element in the system of acquisition and transmission of knowledge in the Renaissance. In the particular case ofPericles, the play unfolds over a vast international geography and creates powerful visual effects. The imaginative spatial conventions of the play can be assimilated to the system of geometrical projection on which maps depended. Locations are used according to a geometric triangulation system to refract the imaginative and spatial vision. As in emblems, the locations unfolding in the play give the action meaning in the process of involved spectatorship. Moreover, in the theatre, the lone monocular beholder of mathematical linear perspective is multiplied into a choric array of spectators.

Cultural heritage and the attendant variety of built heritage demands a scientific approach from European committees: one related to the difficulties in its protection and management. This is primarily due to the lack of emergency protocols related to the structural knowledge and documentation pertaining to architecture and its ruins, specifically in terms of the goals of protection and intervention for endangered heritage affected by mechanical instabilities. Here, we focus on a rapid and reliable structural documentation pipeline for application to historical built heritage, and we introduce a case study of the Church of the Annunciation in Pokcha, Russia, while we also review the incorporation of integrated 3D survey products into reality-based models. This practice increases the possibility of systematising data through methodological phases and controlling the quality of numerical components into 3D polygonal meshes, with millimetric levels of detail and triangulation through the integration of terrestrial laser scanner and unmanned aerial vehicle survey data. These models are aimed at emphasising morphological qualities related to structural behaviour, thus highlighting areas of deformation and instability of the architectural system for analysis via computational platforms in view of obtaining information related to tensional behaviour and emergency risks.

This study explores the application of computer-aided design and manufacture (CAD/CAM) to the process of electronically surveying a scanned dental cast as a prior stage to producing a sacrificial pattern for a removable partial denture (RPD) metal alloy framework. These are designed to retain artificial replacement teeth in the oral cavity. A cast produced from an impression of a patient's mouth was digitally scanned and the data converted to a three-dimensional computer file that could be read by the computer-aided design (CAD) software. Analysis and preparation were carried out in the digital environment according to established dental principles. The CAD software was then used to design the framework and generate a standard triangulation language (STL) file in preparation for its manufacture using rapid prototyping (RP) methods. Several RP methods were subsequently used to produce sacrificial patterns, which were then cast in a chromium-cobalt alloy using conventional methods and assessed for accuracy of fit. This work demonstrates that CAD/CAM techniques can be used for electronic dental cast analysis, preparation, and design of RPD frameworks. It also demonstrates that RP-produced patterns may be successfully cast using conventional methods and that the resulting frameworks can provide a satisfactory fit.

Abstract Various sectors of the economy such as transport and renewable energy have shown great interest in sea bed models. The required measurements are usually carried out by ship-based echo sounding, but this method is quite expensive. A relatively new alternative is data obtained by airborne lidar bathymetry. This study investigates the accuracy of these data, which was obtained in the context of the project ‘Investigation on the use of airborne laser bathymetry in hydrographic surveying’. A comparison to multi-beam echo sounding data shows only small differences in the depths values of the data sets. The IHO requirements of the total horizontal and vertical uncertainty for laser data are met. The second goal of this paper is to compare three spatial interpolation methods, namely Inverse Distance Weighting (IDW), Delaunay Triangulation (TIN), and supervised Artificial Neural Networks (ANN), for the generation of sea bed models. The focus of our investigation is on the amount of required sampling points. This is analyzed by manually reducing the data sets. We found that the three techniques have a similar performance almost independently of the amount of sampling data in our test area. However, ANN are more stable when using a very small subset of points.

Comparing typical airborne mapping systems with Unmanned Airborne Systems (UAS) developed for mapping purposes, there are several advantages and disadvantages of both systems. The unquestionable benefits of UAS are the much lower costs of equipment and the simple operation; though, the regulations to fly UAS greatly vary by country. Low cost, however, means small sensor size and low weight, thus, sensors usually lack the quality, negatively impacting the accuracy of UAS data and, consequently, any derived mapping products. This work compares the performance of three different positioning approaches used for UAS image geolocation. The first one is based on using dual-frequency GPS data, post-processed in kinematic mode. The second approach uses the single frequency, code only GPS data that was acquired and processed by a geotagger, attached to mapping camera. Finally, the third one employs indirect image georeferencing, based on aerial triangulation using ground controls. As expected, the quality of data provided by the inexpensive GPS receiver (geotagger) is not suitable for mapping purposes. The two other approaches provided similar and reliable results, confirming that commonly used indirect georeferencing, which usually assures good solution, can be replaced by direct georeferencing. The latter technique results not only in reduction of field work, e.g. Ground Control Points (GCPs) surveying, but is appropriate for use with other sensors, such as active imaging technology, LiDAR, further extending UAS application potential.

High-resolution imagery is an attractive option for surveying and mapping applications due to the advantages of high quality imaging, short revisit time, and lower cost. Automated reliable and dense image matching is essential for photogrammetric 3D data derivation. Such matching, in urban areas, however, is extremely difficult, owing to the complexity of urban textures and severe occlusion problems on the images caused by tall buildings. Aimed at exploiting high-resolution imagery for 3D urban modelling applications, this paper presents an integrated image matching and segmentation approach for reliable dense matching of high-resolution imagery in urban areas. The approach is based on the framework of our existing self-adaptive triangulation constrained image matching (SATM), but incorporates three novel aspects to tackle the image matching difficulties in urban areas: 1) occlusion filtering based on image segmentation, 2) segment-adaptive similarity correlation to reduce the similarity ambiguity, 3) improved dense matching propagation to provide more reliable matches in urban areas. Experimental analyses were conducted using aerial images of Vaihingen, Germany and high-resolution satellite images in Hong Kong. The photogrammetric point clouds were generated, from which digital surface models (DSMs) were derived. They were compared with the corresponding airborne laser scanning data and the DSMs generated from the Semi-Global matching (SGM) method. The experimental results show that the proposed approach is able to produce dense and reliable matches comparable to SGM in flat areas, while for densely built-up areas, the proposed method performs better than SGM. The proposed method offers an alternative solution for 3D surface reconstruction in urban areas.

Direct Georeferencing was shown to be an important alternative to standard indirect image orientation using classical or GPS-supported aerial triangulation. Since direct Georeferencing without ground control relies on an extrapolation process only, particular focus has to be laid on the overall system calibration procedure. The accuracy performance of integrated GPS/inertial systems for direct Georeferencing in airborne photogrammetric environments has been tested extensively in the last years. In this approach, the limiting factor is a correct overall system calibration including the GPS/inertial component as well as the imaging sensor itself. Therefore remaining errors in the system calibration will significantly decrease the quality of object point determination. <br><br> This research paper presents an error analysis for the airborne direct Georeferencing technique, where integrated GPS/IMU positioning and navigation systems are used, in conjunction with aerial cameras for airborne mapping compared with GPS/INS supported AT through the implementation of certain amount of error on the EOP and Boresight parameters and study the effect of these errors on the final ground coordinates. <br><br> The data set is a block of images consists of 32 images distributed over six flight lines, the interior orientation parameters, IOP, are known through careful camera calibration procedure, also 37 ground control points are known through terrestrial surveying procedure. The exact location of camera station at time of exposure, exterior orientation parameters, EOP, is known through GPS/INS integration process. The preliminary results show that firstly, the DG and GPS-supported AT have similar accuracy and comparing with the conventional aerial photography method, the two technologies reduces the dependence on ground control (used only for quality control purposes). Secondly, In the DG Correcting overall system calibration including the GPS/inertial component as well as the imaging sensor itself is the limiting factor to achieve good object space.

<p><strong>Abstract.</strong> Although the Portuguese discovered the shores of south-western Africa as early as 1487, its hostile coastal desert Namib delayed even limited European reconnaissance of the hinterland until late in the eighteenth century. It was not before the second half of the nineteenth century that serious commercial and missionary interest took off. These explorations resulted in route and basic overview maps of a rugged and for the most only sparsely populated region of about one million square kilometres, stretching from the coastal Namib Desert across a central highland to the slopes of the Kalahari basin in the heart of the subcontinent.</p><p> The need for more detailed mapping arose with the ‘Scramble for Africa’, when German merchant Adolf Lüderitz in 1883 bought Angra Pequena, one of only two natural harbours on that coast. Along with subsequent acquisitions between the Orange River in the south and the Kunene River in the north with a substantial hinterland, in April 1884 was declared Schutzgebiet Deutsch-Südwestafrika, the first and soon most important German colony in Africa. After establishing the boundaries (1885 with Portugal, 1890 with United Kingdom) and succeeding in pacifying the indigenous communities, colonial penetration and valorisation only was possible based on topographical knowledge. To facilitate this, official series ranged from small-scale coverage with scattered features for peripheral regions, often based on simple route traverses, to very detailed and triangulation backed large-scale series with significant private supplement series by land and mining concessionaires.</p><p> This paper discusses the relevant characteristics of nine topographical map series and one atlas, which reflect the scope, achievements and inevitable shortcomings of just a quarter of a century of intense official and private surveying and mapping in German South West Africa:</p><p> 1892&amp;ndash;94 [Francois Sheets], first de facto official series, mostly in 1:300,000</p><p> 1894&amp;ndash;96 Deutscher Kolonial-Atlas by P. Langhans, first completed atlas, 1:2,000,000</p><p> 1904 Hartmann-Karte of the northern protectorate, first private series, 1:300,000</p><p> 1904 Kriegskarte by P. Sprigade &amp; M. Moisel, watershed official series, 1:800,000</p><p> 1906&amp;ndash;08 Deutsch-Südwestafrika, “proto”-version of the official series in medium scale, 1:400,000</p><p> 1908&amp;ndash;12 Krokierblätter Deutsch-Südwestafrika, official series in large scale, 1:100,000</p><p> 1910 Übersichtskarte des Diamantengebietes, largest scale private series, 1:50,000</p><p> 1910&amp;ndash;12 Deutsch-Südwestafrika, preliminary official series in medium scale, 1:400,000</p><p> 1913 Karte des Sperrgebiets in the south-western protectorate, private series, 1:100,000</p><p> 1913&amp;ndash;[21?] [Bergrechtskarte] of the central protectorate, last private series, 1:200,000</p><p> That scope and output of surveying and topography was only reached again half a century later, after two world wars, a recession and a long-time cartographic indifference by South Africa, custodian of the territory in 1919&amp;ndash;90, which also by renewed mapping efforts since the 1970s tried to counter movements towards the ultimate independence of Namibia in 1990.</p>

Abstract. Global Navigation Satellite Systems (GNSS) are space based positioning techniques and widely used in geodetic applications. Geodetic networking accomplished by engineering surveys constitutes one of these tasks. Geodetic networks are used as the base of all kinds of geodetic implementations, Co from the cadastral plans to the relevant surveying processes during the realization of engineering applications. Geodetic networks consist of control points positioned in a defined reference frame. In fact, such positional information could be useful for other studies as well. One of such fields is geodynamic studies that use the changes of positions of control stations within a network in a certain time period to understand the characteristics of tectonic movements. In Turkey, which is located in tectonically active zones and struck by major earthquakes quite frequently, the positional information obtained in engineering surveys could be very useful for earthquake related studies. For this purpose, a GPS (Global Positioning System) network of 650 stations distributed over Istanbul (Istanbul GPS Triangulation Network; abbreviated IGNA) covering the northern part of the North Anatolian Fault Zone (NAFZ) was established in 1997 and measured in 1999. From 1998 to 2004, the IGNA network was extended to 1888 stations covering an area of about 6000 km2, the whole administration area of Istanbul. All 1888 stations within the IGNA network were remeasured in 2005. In these two campaigns there existed 452 common points, and between these two campaigns two major earthquakes took place, on 17 August and 12 November 1999 with a Richter scale magnitude of 7.4 and 7.2, respectively. Several studies conducted for estimating the horizontal and vertical displacements as a result of these earthquakes on NAFZ are discussed in this paper. In geodynamic projects carried out before the earthquakes in 1999, an annual average velocity of 2–2.5 cm for the stations along the NAFZ were estimated. Studies carried out using GPS observations in the same area after these earthquakes indicated that point displacements vary depending on their distance to the epicentres of the earthquakes. But the directions of point displacements are similar. The results obtained through the analysis of the IGNA network also show that there is a common trend in the directions of point displacements in the study area. In this paper, the past studies about the tectonics of Marmara region are summarised and the results of the displacement analysis on the IGNA network are discussed.

<p><strong>Abstract.</strong> In East Asia, the modern hydrographical survey was promoted during the Opium War (1840&amp;ndash;1842) and the Arrow War (1856&amp;ndash;1860) by Western countries, which demanded the establishment of modern trade relations with this area. However, the application of modern mapping such as triangulation to its inlands was limited even at the end of the nineteenth century, because it required stable and innovative governments for implementation. Keeping this uneven extension of modern cartography in East Asia in mind, we should pay attentions also to various map makings, which had been carried out in most of the inlands, in order to unravel the process of transition from early modern to modern cartography. In this presentation, I would like to follow up Japanese mappings in Taiwan and Korea to scrutinize their role for the preparation of modern survey.</p><p>Japan had little geographical information of neighbouring countries except China at the start of the Meiji Government, because of the long national seclusion during the Tokugawa Era, Accordingly, it depended heavily on foreign source in this period. Concerning Korea, Japanese army printed a large map titled “A complete map of Korea” (Fig. 1), compiling Western charts, native maps of Korea, and maps of China, which were affiliated with the Qing Imperial Atlas of the 18th century. As for Taiwan, various materials including Western charts, maps prepared by an American former consul at Amoy and a Chinese administrative map copied secretly at the residence of a high official of Taiwan were gathered and translated into Japanese for the use of military expedition in 1874.</p><p>However, a stark contrast is found concerning subsequent map making in these two areas. After the treaty of Kanghwa (1876), Japanese navy promoted hydrographical survey of coasts of Korea, which had not been surveyed yet by Western ships under the pretext of the search of new treaty port. In addition, army officers were dispatched to Japanese diplomatic offices in Korea for land survey after the Imo Military Rebellion (1882). Traversing with compass and pacing was commonly conducted by them. Up to the start of the Sino-Japanese War (1894), Japanese army prepared 64 sheets of 1&amp;thinsp;:&amp;thinsp;200,000 maps to cover most of the territory of Korea compiling geographical information accumulated mainly during 1880s. In contrast, only one sheet of 1&amp;thinsp;:&amp;thinsp;200,000 and one sheet of 1&amp;thinsp;:&amp;thinsp;500,000 maps were printed till the end of 1894 for Taiwan, which had been unexpected to be battlefield (Fig.2).</p><p>However, Japanese army concentrated surveyors to Taiwan for plane table surveying after the conclusion of the peace treaty of Shimonoseki (1895), in which the cession of Taiwan was specified. Until 1903, 147 sheets of 1&amp;thinsp;:&amp;thinsp;50,000 and 1&amp;thinsp;:&amp;thinsp;20,000 maps, which covered coastal areas, were completed. Although the same kind of military survey was started in Korea, it took longer time to cover the whole area than that in Taiwan, mainly because of the native people’s resistance movements against it.</p><p>Subsequent cadastral and topographical surveys including triangulation in colonial Taiwan and Korea were carried out on the basis of these preceding mappings. In addition to geographical knowledge summarized in these transitional maps, surveyors who had mastered specialized skills during the wartime mapping played important roles in these colonial projects. It should be also noted native youth were trained and hired for these surveys.</p>

<p><strong>Abstract.</strong> Japan has 111 active volcanoes accounting for about 7 percent of active volcanoes in the world and many volcanic disasters have been recorded so far. Geospatial Information Authority of Japan (GSI) proceeds to develop Volcanic Base Map, which depicts specific landforms of volcanoes precisely from 1979 to 2009 for the purpose of providing basic information for formulating various types of volcanic disaster prevention plans and volcano research. Although Volcanic Base Maps have been created by aerial photogrammetry for 31 active volcanoes throughout Japan as a paper map with a scale of 1:2,500 to 1:10,000, they have not been able to meet the needs of recent volcanic disaster prevention measures and have not been fully utilized in disaster emergency measures due to the following reasons: (1) There are undeveloped volcanoes because creation pace was limited for one volcano per year in the conventional creation method; (2) Considerable number of years has passed after its maintenance, so the latest terrain and infrastructure have not been updated; (3) It is impossible to cover the whole area of the volcano and the range of damage estimation because the development around the crater is mainly focused; (4) Basic information such as disaster prevention related facility information, which is necessary for the formulating volcanic disaster prevention plan and disaster emergency measures, has not been covered; (5) Since they were provided by a paper map for a fee, they were not suitable for advanced application using GIS.</p><p>In order to solve the above issues and to promptly develop and provide maps of volcanoes, we have revised methods of making and acquisition criteria and have newly created Volcanic Base Map Data from 2017. Contour line data was created using digital stereoscopic machine in the conventional method of Volcanic Base Map, but it was changed to generate automatically by Digital Elevation Model of airborne laser survey. Also, we have changed to create features such as roads, buildings and disaster prevention-related facilities by using existing geospatial data maintained by GSI and materials collected from relevant organs. Therefore, the process of numerical mapping and associated photocontrol points surveying, pricking and aerial triangulation becomes omissible, and the number of creating maps can be increased. Although some of the designated evacuation shelters and heliports are not acquired in the conventional Volcanic Base Map, they are added as an acquisition item in Volcanic Base Map Data in order to make it easier to utilize to disaster prevention plan and emergency measures.</p><p>Volcanic Base Map Data consists of three types of raster image data (base map, colour relief map and photomap, Figure 1), two types of vector data (Shapefile and Digital Mapping data) and GSI Tile data, is started to provide and publish on March 31, 2017 on the website of GSI and 14 volcanoes are provided as of October 2018. While Volcanic Base Map Data is possible to update in a very short time compared to conventional paper maps by maintaining and creating as numerical data, if there is a change in the contents of display such as disaster prevention related facilities and important infrastructures, it is necessary to consider a mechanism that can quickly update and publish maps. Furthermore, it is necessary to promote the products in each of the Volcano Disaster Management Councils and to continuously grasp the needs of users to be utilized more in the future.</p>

<p><strong>Abstract.</strong> An important phenomenon in cartography in the 19th Century is the emergence of thematic cartography and especially distribution maps. The latter represent the spatial distribution of a particular feature in an area. Distribution maps may be qualitative such as those representing the land use or land cover, geological maps, … or also quantitative, such as maps representing the population distribution by dots or isolines.</p><p> Even if in the 18th C. (or even earlier), some thematic maps were drawn, the real development of the thematic mapping only started in the 19th C. In cartographic literature, large attention was paid to the cholera map of Snow from 1854. It has often been cited (also in geographical information science) as an example of early spatial analysis; what he visually did is today a well-known technique and methodology of buffer analysis in GIS. But the most impressive thematic maps are the early 19th C. chronostratigraphical maps, mostly described as geological maps. This type of inventory maps - important till the end of the 20th C. &amp;ndash; are now completely substituted by digital data.</p><p> If the development of thematical maps was an answer on one hand to industrialisation and changing ideas about the concept of richness, it was on the other hand also only made possible by the development of new printing techniques. Belgium was a forerunner in realizing geological maps. Already in the Dutch period (1815&amp;ndash;1830) systematic field observations were executed in the southern part of Belgium. In this period a map was realized representing ore deposits (“<i>Geologische kaart van een gedeelte der Nederlanden</i>”), under the direction of J.E. Van Gorkum, with scientific input by professor Van Breda; the map was published in the Netherlands in 1834, after Belgian independency.</p><p> The map is also interesting from another point of view as it is representing the triangulation network the Dutch established in Belgium before 1830 in the framework of the Military Reconnaissance. They were part of a systematic mapping project under supervision of the Topographical Bureau with a section responsible for the Northern provinces and one for the Southern provinces, which realized those Military Reconnaissance maps. Captain Erzey executed a triangulation over the southern provinces. Later on, those coordinates served Vander Maelen to realize his 1&amp;thinsp;:&amp;thinsp;20&amp;thinsp;000 and 1&amp;thinsp;:&amp;thinsp;80&amp;thinsp;000 topographical mapping of Belgium.</p><p> On the one hand, the awareness that a new and a more precise surveying and cartography was needed and on the other hand that inventories of different thematic data were needed, must be seen not only in the context of industrialization but also in the change of the role of landownership in the society through the ages.</p><p> In the Middle Ages and the Renaissance, the landownership was a synonym for richness. The land-owners (abbeys, noblemen, …) could collect taxes based on this ownership (the so-called taxation paradigm). In the 19th Century, land also became a good that could be traded. The trading land also induced a need for a stricter legal framework. In France, typically Napoleon erected not only the Cadastre Law to partition the tax collection more fairly but he also mentioned “<i>Un bon cadastre parcellaire sera le complément de mon code en ce qui concerne la possession du sol. Il faut que les plans soient assez exacts et assez développés pour servir à fixer les limites des propriétés et empêcher les procès.</i>” (“<i>A good land cadastre will be the complement of my code regarding the ownership of the soil. Maps must be accurate enough and developed enough to set property boundaries and prevent lawsuits</i>”) (Letter of Napoleon to his Minister of Finance Mollien). This period when land also became a negotiable good fits in a so-called legal paradigm.</p><p> The land registry reform affecting the whole French Empire cannot be seen separately from the reform Napoleon wished to set up for his topographical maps. Napoleon established a commission that had to define the cartographic system of a new topographic map covering the French Empire. Even if the ellipsoid of Delambre and the Bonne projection were retained, the map production could never be launched. The measurements of Captain Erzey in the Dutch period can be considered as the first attempt (in Belgium) to map the territory on a geodetically correct basis.</p><p> During one and a half century the negotiable aspect of land was predominant. Map making was requiring the best available geometric accuracy. The needs of map making changed fundamentally when land also became scarcer, when it became a scarce good. The increasing need for planning in the second part of the 20th C. for the sake of land scarcity finally induced &amp;ndash; when techniques (in particular GIS) would allow it - the development of multi-purpose spatial data systems.</p></p>

Aim. Determination of the elements of external spatial orientation of the surveying systems at the moment of image acquisition is the fundamental task in photogrammetry. Principally, this problem is solving in two ways. The first way is direct positioning and measuring of directions of camera optical axis in the geodetic space with the help of GNSS/INS equipment. The second way is the analytical solution of the problem using a set of reference information (often such information is a set of ground control points whose geodetic positions are known with sufficient accuracy and which are reliably recognised on aerial images of the photogrammetric block). The authors consider the task of providing reference and control information using the second approach, which has a number of advantages in terms of reliability and accuracy of determining the unknown image exterior orientation parameters. It is proposed to obtain additional images of ground control points by the method of their auxiliary aerial photography using an unmanned aerial vehicle (UAV) on a larger scale compared to the scale of the images of the photogrammetric block. The aim of the presented work is the implementation of the method of creating reference points and experimental confirmation of its effectiveness for photogrammetric processing. Methods and results. For the entire realization of the potential of the analytical way to determine the elements of external orientation of images, it is necessary to have a certain number of ground control points (GCP) and to keep the defined scheme of their location on the photogrammetric block. As the main source of input data authors use UAV aerial images of the terrain, which are obtained separately from the block of aerial survey, and have a better geometric resolution and which clearly depict the control reference points. Application of such auxiliary images gives the possibility of automated transferring of the position of ground control point into images of the main photogrammetric block. In our interpretation, these images of ground control points and their surroundings on the ground are called "control reference images". The basis of the work is to develop a method for obtaining the auxiliary control reference images and transferring of position of GCP depicted on them into aerial or space images of terrain by means of computer stereo matching. To achieve this goal, we have developed a processing method for the creation of control reference images of aerial image or a series of auxiliary multi-scale aerial images obtained by a drone from different heights above the reference point. The operator identifies and measures the GCP once on the auxiliary aerial image of the highest resolution. Then there is an automatic stereo matching of the control reference image in the whole series of auxiliary images in succession with a decrease in the resolution and, ultimately, directly with the aerial images of photogrammetric block. On this stage there are no recognition/cursor targeting by the human operator, and therefore there are no discrepancies, errors or mistakes related to it. In addition, if to apply fairly large size of control reference images, the proposed method can be used on a low-texture terrain, and therefore deal in many cases without the physical marking of points measured by GNSS method. And this is a way to simplify and reduce the cost of photogrammetric technology. The action of the developed method has been verified experimentally to provide the control reference information of the block of archival aerial images of the low-texture terrain. The results of the experimental approbation of the proposed method give grounds to assert that the method makes it possible to perform geodetic reference of photogrammetric projects more efficiently due to the refusal of the physical marking of the area before aerial survey. The proposed method can also be used to obtain the information for checking the quality of photogrammetric survey for provision of check points. The authors argue that the use of additional equipment - UAV of semi-professional class to obtain control reference images is economically feasible. Scientific novelty and practical relevance. The results of approbation of the "control reference image" method with obtaining stereo pairs of aerial images with vertical placement of the base are presented for the first time. There was implemented the study of the properties of such stereo pairs of aerial images to obtain images of reference points. The effectiveness of including reference images in the main block of the digital aerial triangulation network created on UAV’s images is shown.

UAV aerial remote sensing system has the characteristics of strong real-time, flexible, high image resolution and low cost, which can be applied to map mapping tasks under various terrain. In this paper, the key technology of UAV Remote Sensing Surveying and mapping, the process of image processing, the research of mosaic method and the field application of remote sensing technology are studied. Aiming at the characteristics of UAV image with high resolution and small image frame, three methods of image map making are proposed, namely, single image geometric correction method, mosaic correction method and aerial triangulation method. This paper focuses on the key technical problems of the three methods, and makes a comprehensive analysis and experimental verification of each method from the aspects of mapping effect, accuracy and efficiency. The experimental results show that the UAV remote sensing technology can meet the real-time basic surveying and mapping data requirements of urban mapping. This method can meet the needs of 1:500 high-precision mapping. The system can reduce the cost and improve the usability when it is used to update the basic data of Urban Surveying and mapping.

Complex systems are open, recursive, organic, nonlinear and emergent. Reconceptualizing curriculum, teaching and learning in complexivist terms foregrounds the unpredictable and generative qualities of educational processes, and invites educators to value that which is unexpected and/or beyond their control. Nevertheless, concepts associated with simple systems persist in contemporary discourses of educational inquiry, and continue to inform practices of complexity reduction through which researchers and other practitioners seek predictability and control. In this essay, I examine a number of theoretical, practical and historical dimensions of complexity reduction in education and their implications for inquiry and action. I focus in particular on the ways in which some education researchers have reduced the complexity of the objects of their inquiries through ‘methodological borrowings’ from other research endeavors, such as borrowing a version of ‘evidence-based’ research from medical science, and borrowing the ‘triangulation’ metaphor from surveying.

Internationalization offers opportunities to small firms in small island developing states for market growth, sustainability, reduced dependency on local markets, and economies of scale. As small- and medium-sized enterprises (SMEs) are increasingly playing a significant role in many countries’ socioeconomic development, Mauritian-based textile manufacturers are seen as an engine of growth for the Mauritian economy by attracting foreign direct investment, subsequently creating jobs and strengthening the manufacturing base of the economy. In this regard, the contribution of the textile industry in transforming the Mauritian economy from a middle-income economy to a high-income economy is widely acknowledged. However, most of the small- and medium-sized Mauritian textile manufacturing firms are currently not internationalized and face several domestic survival and sustainability challenges resulting from the liberalized trading system adopted by the Mauritian government in 2005. In this article, we investigate firm size-related factors, which influence small textile manufacturers’ internationalization intentions. We argue that factors relating to financial and non-financial resources are the main causes discouraging small firms’ internationalization. These factors emerged from interviews with ten internationalized medium-sized textile manufacturers in Mauritius that overcame their size-related barriers. We further extended the research by surveying the whole population of internationalized medium-sized textile manufacturers in Mauritius for triangulation purposes.

The creation of geodetic networks for open deposits has its own characteristics, in contrast to the creation of conventional geodetic networks. Surveying networks of support points for groups of quarries and individual quarries located in developed mining regions, as well as in large industrial, hydraulic and agricultural structures adjacent to cities, are being developed on the basis of existing networks of higher-class triangulation points. In the absence of higher-class triangulation points, open source support networks are created independently. The study of geodetic monitoring in mining, especially in deposits that are developed in an open way. The design of geodetic reference networks depends entirely on the shape of the quarry and the system of its opening. According to its form, choose the method of creating a planned geodetic basis. For the most part, a backbone network is created to further condense and create a film network.After analyzing the methods of creating a spatial reference network for open deposits, we concluded that the classical methods of creating a planned-height geodetic network on the territory of the mining enterprise are time-consuming, long-term and economically unprofitable. The GNSS method is the best for creating such networks at present. Of course, it cannot fully replace all methods due to various constraints, such as interference, lack of communication, and adverse weather conditions. Therefore, given the advantages and disadvantages of the methods analyzed in the article to create spatial networks in open fields, the authors consider it appropriate to combine the GNSS method with polygonometry, as the use of only satellite measurement method is impractical, but in combination with polygonometry -altitude networks for geodetic works. This combination significantly reduces measurement time, is less time-consuming, cost-effective and meets the accuracy requirements of the relevant networks. Approbation of the combination of methods for the creation of a spatial geodetic network for monitoring the open field was carried out at the Vilnohirsk mining and metallurgical plant.

The use of GNSS technologies for precise point positioning enabled the calculations for single-point observations or relative positioning of long baselines. The GNSS absolute and relative positioning techniques can be implemented between points within different tectonic plates, while the classical surveying methods start from local reference/triangulation points to near points within a few kilometers. The definition of the kinematic models of the earth has become an important role in GNSS measurements techniques and networks adjustment methods based on international terrestrial reference frames (ITRF), where the reference points can be located in different continents and tectonic plates. Thus, the position calculations in the ITRF systems are time-dependent. To satisfy the requirements of land and cadastral surveying, the bidirectional transformation between classical geodetic networks and GNSS global, regional and local networks is nowadays a primary requirement in modern geodesy. While the classical networks were defined locally assuming a static earth system, the ITRF coordinates by GNSS techniques are defined globally and directly affected by earth kinematics including plate tectonics and local crustal movements. However, Palestine has a special kinematic situation because it is located at the border between two plates; Nubia/Sinai plate and the Arabia plate along the Jordan valley line. Thus, the result is unsteady surface kinematics all over the country, which has a longitudinal shape parallel to the Jordan valley rift. Using the IGS/EUREF stations and GNSS stations data that are freely available on the internet, varying positional velocities were calculated in both magnitude and direction using years of daily available GNSS raw observations. The GNSS precise observation techniques have proven that the points of the classical networks were subjected to a kinematic situation over the years. Therefore, the Palestinian geodetic network has to be revised for kinematic effects for the integration with the modern GNSS positioning. In this work, the effect of surface movements is included in the calculations between the different ITRF coordinate systems and the classical geodetic network of Palestine. To achieve the required transformations between ITRF and the classical network, a velocities model was established and tested utilizing GIS raster interpolation. The accuracy of the modeled velocities could support 1cm in static or real-time GNSS positioning. This made it possible for the integration between geodetic measurements between different time epochs.

Abstract Background Non-governmental organizations (NGOs) and donors often promote certain practices to a community, such as in-facility births and then evaluate the efficacy of those interventions, in part, by surveying those populations. Methods A project to assess the accuracy of birth and death monitoring by local community-based monitors was undertaken with a partner health agency in areas (pop. 94,000) where they supported medical facilities. Thirty clusters of 30 households each were selected at random, probability proportional to size. Half of those households were enrolled for a monthly visitation surveillance process. To gain insights into the effects of the agency’s services, an additional 240 households were selected at random and interviewed from 8 nearby “matched villages” not serviced by any NGO as a comparison sample. Results The 896 households with 4243 living residents within the NGO service area were interviewed about household births and deaths within the past 8 months. They reported an annualized birth rate of 5.6% (95% CI: 4.5–6.7) with only 3% of those births occurring at home. The reported death rate was 4.2/1000/month (95% CI: 3.3–5.0). In the “matched villages,” the population reported a similar birth and death rate, but they reported 29% of births occurring within the home. The monthly surveillance data found over the year that followed that 32% of births occurred at the home. Clinic and hospital birth attendance data suggested an attended annual birth rate of only 2.8%, consistent with the surveillance data implication that a huge fraction of births occur at home. Conclusion It is believed that because the baseline interviews occurred with a stranger, this induced interviewees to say what they thought the interviewers wanted to hear. This calls into question the validity of household surveys when agencies have a known agenda or position, and highlights the need for external validation or triangulation of survey findings.

Introduction: Technology EnthusiasmEnthusiasts are people who have a passion, keenness, dedication or zeal for a particular activity or hobby. Today, there are enthusiasts for almost everything, from genealogy, costume dramas, and country houses, to metal detectors, coin collecting, and archaeology. But to be described as an enthusiast is not necessarily a compliment. Historically, the term “enthusiasm” was first used in England in the early seventeenth century to describe “religious or prophetic frenzy among the ancient Greeks” (Hanks, n.p.). This frenzy was ascribed to being possessed by spirits sent not only by God but also the devil. During this period, those who disobeyed the powers that be or claimed to have a message from God were considered to be enthusiasts (McLoughlin).Enthusiasm retained its religious connotations throughout the eighteenth century and was also used at this time to describe “the tendency within the population to be swept by crazes” (Mee 31). However, as part of the “rehabilitation of enthusiasm,” the emerging middle-classes adopted the word to characterise the intensity of Romantic poetry. The language of enthusiasm was then used to describe the “literary ideas of affect” and “a private feeling of religious warmth” (Mee 2 and 34). While the notion of enthusiasm was embraced here in a more optimistic sense, attempts to disassociate enthusiasm from crowd-inciting fanaticism were largely unsuccessful. As such enthusiasm has never quite managed to shake off its pejorative connotations.The 'enthusiasm' discussed in this paper is essentially a personal passion for technology. It forms part of a longer tradition of historical preservation in the United Kingdom and elsewhere in the world. From preserved railways to Victorian pumping stations, people have long been fascinated by the history of technology and engineering; manifesting their enthusiasm through their nostalgic longings and emotional attachment to its enduring material culture. Moreover, enthusiasts have been central to the collection, conservation, and preservation of this particular material record. Technology enthusiasm in this instance is about having a passion for the history and material record of technological development, specifically here industrial archaeology. Despite being a pastime much participated in, technology enthusiasm is relatively under-explored within the academic literature. For the most part, scholarship has tended to focus on the intended users, formal spaces, and official narratives of science and technology (Adas, Latour, Mellström, Oldenziel). In recent years attempts have been made to remedy this imbalance, with researchers from across the social sciences examining the position of hobbyists, tinkerers and amateurs in scientific and technical culture (Ellis and Waterton, Haring, Saarikoski, Takahashi). Work from historians of technology has focussed on the computer enthusiast; for example, Saarikoski’s work on the Finnish personal computer hobby:The definition of the computer enthusiast varies historically. Personal interest, pleasure and entertainment are the most significant factors defining computing as a hobby. Despite this, the hobby may also lead to acquiring useful knowledge, skills or experience of information technology. Most often the activity takes place outside working hours but can still have links to the development of professional expertise or the pursuit of studies. In many cases it takes place in the home environment. On the other hand, it is characteristically social, and the importance of friends, clubs and other communities is greatly emphasised.In common with a number of other studies relating to technical hobbies, for example Takahashi who argues tinkerers were behind the advent of the radio and television receiver, Saarikoski’s work focuses on the role these users played in shaping the technology in question. The enthusiasts encountered in this paper are important here not for their role in shaping the technology, but keeping technological heritage alive. As historian of technology Haring reminds us, “there exist alternative ways of using and relating to technology” (18). Furthermore, the sociological literature on audiences (Abercrombie and Longhurst, Ang), fans (Hills, Jenkins, Lewis, Sandvoss) and subcultures (Hall, Hebdige, Schouten and McAlexander) has also been extended in order to account for the enthusiast. In Abercrombie and Longhurst’s Audiences, the authors locate ‘the enthusiast’ and ‘the fan’ at opposing ends of a continuum of consumption defined by questions of specialisation of interest, social organisation of interest and material productivity. Fans are described as:skilled or competent in different modes of production and consumption; active in their interactions with texts and in their production of new texts; and communal in that they construct different communities based on their links to the programmes they like. (127 emphasis in original) Based on this definition, Abercrombie and Longhurst argue that fans and enthusiasts differ in three ways: (1) enthusiasts’ activities are not based around media images and stars in the way that fans’ activities are; (2) enthusiasts can be hypothesized to be relatively light media users, particularly perhaps broadcast media, though they may be heavy users of the specialist publications which are directed towards the enthusiasm itself; (3) the enthusiasm would appear to be rather more organised than the fan activity. (132) What is striking about this attempt to differentiate between the fan and the enthusiast is that it is based on supposition rather than the actual experience and observation of enthusiasm. It is here that the ethnographic account of enthusiasm presented in this paper and elsewhere, for example works by Dannefer on vintage car culture, Moorhouse on American hot-rodding and Fuller on modified-car culture in Australia, can shed light on the subject. My own ethnographic study of groups with a passion for telecommunications heritage, early British computers and industrial archaeology takes the discussion of “technology enthusiasm” further still. Through in-depth interviews, observation and textual analysis, I have examined in detail the formation of enthusiast societies and their membership, the importance of the material record to enthusiasts (particularly at home) and the enthusiastic practices of collecting and hoarding, as well as the figure of the technology enthusiast in the public space of the museum, namely the Science Museum in London (Geoghegan). In this paper, I explore the culture of enthusiasm for the industrial past through the example of the Greater London Industrial Archaeology Society (GLIAS). Focusing on industrial sites around London, GLIAS meet five or six times a year for field visits, walks and a treasure hunt. The committee maintain a website and produce a quarterly newsletter. The title of my paper, “If you can walk down the street and recognise the difference between cast iron and wrought iron, the world is altogether a better place,” comes from an interview I conducted with the co-founder and present chairman of GLIAS. He was telling me about his fascination with the materials of industrialisation. In fact, he said even concrete is sexy. Some call it a hobby; others call it a disease. But enthusiasm for industrial archaeology is, as several respondents have themselves identified, “as insidious in its side effects as any debilitating germ. It dictates your lifestyle, organises your activity and decides who your friends are” (Frow and Frow 177, Gillespie et al.). Through the figure of the industrial archaeology enthusiast, I discuss in this paper what it means to be enthusiastic. I begin by reflecting on the development of this specialist subject area. I go on to detail the formation of the Society in the late 1960s, before exploring the Society’s fieldwork methods and some of the other activities they now engage in. I raise questions of enthusiast and professional knowledge and practice, as well as consider the future of this particular enthusiasm.Defining Industrial ArchaeologyThe practice of 'industrial archaeology' is much contested. For a long time, enthusiasts and professional archaeologists have debated the meaning and use of the term (Palmer). On the one hand, there are those interested in the history, preservation, and recording of industrial sites. For example the grandfather figures of the subject, namely Kenneth Hudson and Angus Buchanan, who both published widely in the 1960s and 1970s in order to encourage publics to get involved in recording. Many members of GLIAS refer to the books of Hudson Industrial Archaeology: an Introduction and Buchanan Industrial Archaeology in Britain with their fine descriptions and photographs as integral to their early interest in the subject. On the other hand, there are those within the academic discipline of archaeology who consider the study of remains produced by the Industrial Revolution as too modern. Moreover, they find the activities of those calling themselves industrial archaeologists as lacking sufficient attention to the understanding of past human activity to justify the name. As a result, the definition of 'industrial archaeology' is problematic for both enthusiasts and professionals. Even the early advocates of professional industrial archaeology felt uneasy about the subject’s methods and practices. In 1973, Philip Riden (described by one GLIAS member as the angry young man of industrial archaeology), the then president of the Oxford University Archaeology Society, wrote a damning article in Antiquity, calling for the subject to “shed the amateur train drivers and others who are not part of archaeology” (215-216). He decried the “appallingly low standard of some of the work done under the name of ‘industrial archaeology’” (211). He felt that if enthusiasts did not attempt to maintain high technical standards, publish their work in journals or back up their fieldwork with documentary investigation or join their county archaeological societies then there was no value in the efforts of these amateurs. During this period, enthusiasts, academics, and professionals were divided. What was wrong with doing something for the pleasure it provides the participant?Although relations today between the so-called amateur (enthusiast) and professional archaeologies are less potent, some prejudice remains. Describing them as “barrow boys”, some enthusiasts suggest that what was once their much-loved pastime has been “hijacked” by professional archaeologists who, according to one respondent,are desperate to find subjects to get degrees in. So the whole thing has been hijacked by academia as it were. Traditional professional archaeologists in London at least are running head on into things that we have been doing for decades and they still don’t appreciate that this is what we do. A lot of assessments are handed out to professional archaeology teams who don’t necessarily have any knowledge of industrial archaeology. (James, GLIAS committee member)James went on to reveal that GLIAS receives numerous enquiries from professional archaeologists, developers and town planners asking what they know about particular sites across the city. Although the Society has compiled a detailed database covering some areas of London, it is by no means comprehensive. In addition, many active members often record and monitor sites in London for their own personal enjoyment. This leaves many questioning the need to publish their results for the gain of third parties. Canadian sociologist Stebbins discusses this situation in his research on “serious leisure”. He has worked extensively with amateur archaeologists in order to understand their approach to their leisure activity. He argues that amateurs are “neither dabblers who approach the activity with little commitment or seriousness, nor professionals who make a living from that activity” (55). Rather they pursue their chosen leisure activity to professional standards. A point echoed by Fine in his study of the cultures of mushrooming. But this is to get ahead of myself. How did GLIAS begin?GLIAS: The GroupThe 1960s have been described by respondents as a frantic period of “running around like headless chickens.” Enthusiasts of London’s industrial archaeology were witnessing incredible changes to the city’s industrial landscape. Individuals and groups like the Thames Basin Archaeology Observers Group were recording what they could. Dashing around London taking photos to capture London’s industrial legacy before it was lost forever. However the final straw for many, in London at least, was the proposed and subsequent demolition of the “Euston Arch”. The Doric portico at Euston Station was completed in 1838 and stood as a symbol to the glory of railway travel. Despite strong protests from amenity societies, this Victorian symbol of progress was finally pulled down by British Railways in 1962 in order to make way for what enthusiasts have called a “monstrous concrete box”.In response to these changes, GLIAS was founded in 1968 by two engineers and a locomotive driver over afternoon tea in a suburban living room in Woodford, North-East London. They held their first meeting one Sunday afternoon in December at the Science Museum in London and attracted over 130 people. Firing the imagination of potential members with an exhibition of photographs of the industrial landscape taken by Eric de Maré, GLIAS’s first meeting was a success. Bringing together like-minded people who are motivated and enthusiastic about the subject, GLIAS currently has over 600 members in the London area and beyond. This makes it the largest industrial archaeology society in the UK and perhaps Europe. Drawing some of its membership from a series of evening classes hosted by various members of the Society’s committee, GLIAS initially had a quasi-academic approach. Although some preferred the hands-on practical element and were more, as has been described by one respondent, “your free-range enthusiast”. The society has an active committee, produces a newsletter and journal, as well as runs regular events for members. However the Society is not simply about the study of London’s industrial heritage, over time the interest in industrial archaeology has developed for some members into long-term friendships. Sociability is central to organised leisure activities. It underpins and supports the performance of enthusiasm in groups and societies. For Fine, sociability does not always equal friendship, but it is the state from which people might become friends. Some GLIAS members have taken this one step further: there have even been a couple of marriages. Although not the subject of my paper, technical culture is heavily gendered. Industrial archaeology is a rare exception attracting a mixture of male and female participants, usually retired husband and wife teams.Doing Industrial Archaeology: GLIAS’s Method and PracticeIn what has been described as GLIAS’s heyday, namely the 1970s to early 1980s, fieldwork was fundamental to the Society’s activities. The Society’s approach to fieldwork during this period was much the same as the one described by champion of industrial archaeology Arthur Raistrick in 1973:photographing, measuring, describing, and so far as possible documenting buildings, engines, machinery, lines of communication, still or recently in use, providing a satisfactory record for the future before the object may become obsolete or be demolished. (13)In the early years of GLIAS and thanks to the committed efforts of two active Society members, recording parties were organised for extended lunch hours and weekends. The majority of this early fieldwork took place at the St Katherine Docks. The Docks were constructed in the 1820s by Thomas Telford. They became home to the world’s greatest concentration of portable wealth. Here GLIAS members learnt and employed practical (also professional) skills, such as measuring, triangulations and use of a “dumpy level”. For many members this was an incredibly exciting time. It was a chance to gain hands-on experience of industrial archaeology. Having been left derelict for many years, the Docks have since been redeveloped as part of the Docklands regeneration project.At this time the Society was also compiling data for what has become known to members as “The GLIAS Book”. The book was to have separate chapters on the various industrial histories of London with contributions from Society members about specific sites. Sadly the book’s editor died and the project lost impetus. Several years ago, the committee managed to digitise the data collected for the book and began to compile a database. However, the GLIAS database has been beset by problems. Firstly, there are often questions of consistency and coherence. There is a standard datasheet for recording industrial buildings – the Index Record for Industrial Sites. However, the quality of each record is different because of the experience level of the different authors. Some authors are automatically identified as good or expert record keepers. Secondly, getting access to the database in order to upload the information has proved difficult. As one of the respondents put it: “like all computer babies [the creator of the database], is finding it hard to give birth” (Sally, GLIAS member). As we have learnt enthusiasm is integral to movements such as industrial archaeology – public historian Raphael Samuel described them as the “invisible hands” of historical enquiry. Yet, it is this very enthusiasm that has the potential to jeopardise projects such as the GLIAS book. Although active in their recording practices, the GLIAS book saga reflects one of the challenges encountered by enthusiast groups and societies. In common with other researchers studying amenity societies, such as Ellis and Waterton’s work with amateur naturalists, unlike the world of work where people are paid to complete a task and are therefore meant to have a singular sense of purpose, the activities of an enthusiast group like GLIAS rely on the goodwill of their members to volunteer their time, energy and expertise. When this is lost for whatever reason, there is no requirement for any other member to take up that position. As such, levels of commitment vary between enthusiasts and can lead to the aforementioned difficulties, such as disputes between group members, the occasional miscommunication of ideas and an over-enthusiasm for some parts of the task in hand. On top of this, GLIAS and societies like it are confronted with changing health and safety policies and tightened security surrounding industrial sites. This has made the practical side of industrial archaeology increasingly difficult. As GLIAS member Bob explains:For me to go on site now I have to wear site boots and borrow a hard hat and a high visibility jacket. Now we used to do incredibly dangerous things in the seventies and nobody batted an eyelid. You know we were exploring derelict buildings, which you are virtually not allowed in now because the floor might give way. Again the world has changed a lot there. GLIAS: TodayGLIAS members continue to record sites across London. Some members are currently surveying the site chosen as the location of the Olympic Games in London in 2012 – the Lower Lea Valley. They describe their activities at this site as “rescue archaeology”. GLIAS members are working against the clock and some important structures have already been demolished. They only have time to complete a quick flash survey. Armed with the information they collated in previous years, GLIAS is currently in discussions with the developer to orchestrate a detailed recording of the site. It is important to note here that GLIAS members are less interested in campaigning for the preservation of a site or building, they appreciate that sites must change. Instead they want to ensure that large swathes of industrial London are not lost without a trace. Some members regard this as their public duty.Restricted by health and safety mandates and access disputes, GLIAS has had to adapt. The majority of practical recording sessions have given way to guided walks in the summer and public lectures in the winter. Some respondents have identified a difference between those members who call themselves “industrial archaeologists” and those who are just “ordinary members” of GLIAS. The walks are for those with a general interest, not serious members, and the talks are public lectures. Some audience researchers have used Bourdieu’s metaphor of “capital” to describe the experience, knowledge and skill required to be a fan, clubber or enthusiast. For Hills, fan status is built up through the demonstration of cultural capital: “where fans share a common interest while also competing over fan knowledge, access to the object of fandom, and status” (46). A clear membership hierarchy can be seen within GLIAS based on levels of experience, knowledge and practical skill.With a membership of over 600 and rising annually, the Society’s future is secure at present. However some of the more serious members, although retaining their membership, are pursuing their enthusiasm elsewhere: through break-away recording groups in London; active membership of other groups and societies, for example the national Association for Industrial Archaeology; as well as heading off to North Wales in the summer for practical, hands-on industrial archaeology in Snowdonia’s slate quarries – described in the Ffestiniog Railway Journal as the “annual convention of slate nutters.” ConclusionsGLIAS has changed since its foundation in the late 1960s. Its operation has been complicated by questions of health and safety, site access, an ageing membership, and the constant changes to London’s industrial archaeology. Previously rejected by professional industrial archaeology as “limited in skill and resources” (Riden), enthusiasts are now approached by professional archaeologists, developers, planners and even museums that are interested in engaging in knowledge exchange programmes. As a recent report from the British think-tank Demos has argued, enthusiasts or pro-ams – “amateurs who work to professional standards” (Leadbeater and Miller 12) – are integral to future innovation and creativity; for example computer pro-ams developed an operating system to rival Microsoft Windows. As such the specialist knowledge, skill and practice of these communities is of increasing interest to policymakers, practitioners, and business. So, the subject once described as “the ugly offspring of two parents that shouldn’t have been allowed to breed” (Hudson), the so-called “amateur” industrial archaeology offers enthusiasts and professionals alike alternative ways of knowing, seeing and being in the recent and contemporary past.Through the case study of GLIAS, I have described what it means to be enthusiastic about industrial archaeology. I have introduced a culture of collective and individual participation and friendship based on a mutual interest in and emotional attachment to industrial sites. As we have learnt in this paper, enthusiasm is about fun, pleasure and joy. The enthusiastic culture presented here advances themes such as passion in relation to less obvious communities of knowing, skilled practices, material artefacts and spaces of knowledge. Moreover, this paper has been about the affective narratives that are sometimes missing from academic accounts; overlooked for fear of sniggers at the back of a conference hall. Laughter and humour are a large part of what enthusiasm is. Enthusiastic cultures then are about the pleasure and joy experienced in doing things. Enthusiasm is clearly a potent force for active participation. I will leave the last word to GLIAS member John:One meaning of enthusiasm is as a form of possession, madness. Obsession perhaps rather than possession, which I think is entirely true. It is a pejorative term probably. The railway enthusiast. But an awful lot of energy goes into what they do and achieve. Enthusiasm to my mind is an essential ingredient. If you are not a person who can muster enthusiasm, it is very difficult, I think, to get anything out of it. On the basis of the more you put in the more you get out. 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