Journal articles: 'Photoscan'

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Kameyama, Shohei, and Katsuaki Sugiura. "Effects of Differences in Structure from Motion Software on Image Processing of Unmanned Aerial Vehicle Photography and Estimation of Crown Area and Tree Height in Forests." Remote Sensing 13, no. 4 (February 9, 2021): 626. http://dx.doi.org/10.3390/rs13040626.

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This study examines the effects of differences in structure from motion (SfM) software on image processing of aerial images by unmanned aerial vehicles (UAV) and the resulting estimations of tree height and tree crown area. There were 20 flight conditions for the UAV aerial images, which were a combination of five conditions for flight altitude, two conditions for overlap, and two conditions for side overlap. Images were then processed using three SfM programs (Terra Mapper, PhotoScan, and Pix4Dmapper). The tree height and tree crown area were determined, and the SfM programs were compared based on the estimations. The number of densified point clouds for PhotoScan (160 × 105 to 50 × 105) was large compared to the two other two SfM programs. The estimated values of crown area and tree height by each SfM were compared via Bonferroni multiple comparisons (statistical significance level set at p < 0.05). The estimated values of canopy area showed statistically significant differences (p < 0.05) in 14 flight conditions for Terra Mapper and PhotoScan, 16 flight conditions for Terra Mapper and Pix4Dmapper, and 11 flight conditions for PhotoScan and Pix4Dmappers. In addition, the estimated values of tree height showed statistically significant differences (p < 0.05) in 15 flight conditions for Terra Mapper and PhotoScan, 19 flight conditions for Terra Mapper and Pix4Dmapper, and 20 flight conditions for PhotoScan and Pix4Dmapper. The statistically significant difference (p < 0.05) between the estimated value and measured value of each SfM was confirmed under 18 conditions for Terra Mapper, 20 conditions for PhotoScan, and 13 conditions for Pix4D. Moreover, the RMSE and rRMSE values of the estimated tree height were 5–6 m and 20–28%, respectively. Although the estimation accuracy of any SfM was low, the estimated tree height by Pix4D in many flight conditions had smaller RMSE values than the other software. As statistically significant differences were found between the SfMs in many flight conditions, we conclude that there were differences in the estimates of crown area and tree height depending on the SfM used. In addition, Pix4Dmapper is suitable for estimating forest information, such as tree height, and PhotoScan is suitable for detailed monitoring of disaster areas.

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Jiroušek, Tomáš, Roman Kapica, and Dana Vrublová. "THE TESTING OF PHOTOSCAN 3D OBJECT MODELLING SOFTWARE." Geodesy and cartography 40, no. 2 (June 24, 2014): 68–74. http://dx.doi.org/10.3846/20296991.2014.930251.

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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.

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Inozemtsev, Dmitriy P. "Air photography by means of hardware-software solution GeoScan-PhotoScan." SAPR i GIS avtomobilnykh dorog, no. 1(2) (2014): 46–51. http://dx.doi.org/10.17273/cadgis.2014.1.10.

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Jebur, Ahmed, Fanar Abed, and Mamoun Mohammed. "Assessing the performance of commercial Agisoft PhotoScan software to deliver reliable data for accurate3D modelling." MATEC Web of Conferences 162 (2018): 03022. http://dx.doi.org/10.1051/matecconf/201816203022.

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3D models delivered from digital photogrammetric techniques have massively increased and developed to meet the requirements of many applications. The reliability of these models is basically dependent on the data processing cycle and the adopted tool solution in addition to data quality. Agisoft PhotoScan is a professional image-based 3D modelling software, which seeks to create orderly, precise n 3D content from fixed images. It works with arbitrary images those qualified in both controlled and uncontrolled conditions. Following the recommendations of many users all around the globe, Agisoft PhotoScan, has become an important source to generate precise 3D data for different applications. How reliable is this data for accurate 3D modelling applications is the current question that needs an answer. Therefore; in this paper, the performance of the Agisoft PhotoScan software was assessed and analyzed to show the potential of the software for accurate 3D modelling applications. To investigate this, a study was carried out in the University of Baghdad / Al-Jaderia campus using data collected from airborne metric camera with 457m flying height. The Agisoft results show potential according to the research objective and the dataset quality following statistical and validation shape analysis.

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Horst Gamba, Sergio Roberto, and Edson Eyji Sano. "Avaliação do PEC em ortofotomosaicos obtidos com RPA e proposta de um modelo matemático para correção geométrica." Revista Brasileira de Geomática 8, no. 4 (November 6, 2020): 314. http://dx.doi.org/10.3895/rbgeo.v8n4.11346.

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O objetivo deste artigo é avaliar o padrão de exatidão cartográfica (PEC) em ortofotomosaicos digitais obtidos por meio de uma aeronave pilotada remotamente e propor um modelo de correção geométrica para o ângulo de guinada, a fim de reduzir a distorção do pixel na imagem. Este artigo é uma continuação dos trabalhos de GAMBA e SANO (2017). As áreas de teste estão localizadas nos estados do RJ (Área 1) e MG (Área 2). A metodologia foi dividida em quatro etapas: planejamento e execução do voo; determinação dos pontos de apoio; geração dos ortofotomosaicos nos aplicativos Agisoft Photoscan® e E-Foto®; e avaliação dos ortofotomosaicos. A avaliação dos ortofotomosaicos foi feita por meio da aplicação do PEC analógico e digital, utilizando o método disponível no aplicativo GeoPEC®. Nesta avaliação, foram verificados o comportamento da distribuição espacial, a normalidade e a acurácia posicional das amostras, com análises de tendência e de precisão. Os resultados demonstraram que os menores erros médios quadráticos (EMQ) na planimetria das Áreas 1 (1,4337m) e 2 (1,1073m) foram no aplicativo Agisoft Photoscan®. O menor EMQ na altimetria da Área 1 (9,5387m) foi no aplicativo E-Foto®. O menor EMQ na altimetria da Área 2 (21,0263 m) foi no aplicativo Agisoft Photoscan®.

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Lumban-Gaol, Y. A., A. Murtiyoso, and B. H. Nugroho. "INVESTIGATIONS ON THE BUNDLE ADJUSTMENT RESULTS FROM SFM-BASED SOFTWARE FOR MAPPING PURPOSES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2 (May 30, 2018): 623–28. http://dx.doi.org/10.5194/isprs-archives-xlii-2-623-2018.

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Since its first inception, aerial photography has been used for topographic mapping. Large-scale aerial photography contributed to the creation of many of the topographic maps around the world. In Indonesia, a 2013 government directive on spatial management has re-stressed the need for topographic maps, with aerial photogrammetry providing the main method of acquisition. However, the large need to generate such maps is often limited by budgetary reasons. Today, SfM (Structure-from-Motion) offers quicker and less expensive solutions to this problem. However, considering the required precision for topographic missions, these solutions need to be assessed to see if they provide enough level of accuracy. In this paper, a popular SfM-based software Agisoft PhotoScan is used to perform bundle adjustment on a set of large-scale aerial images. The aim of the paper is to compare its bundle adjustment results with those generated by more classical photogrammetric software, namely Trimble Inpho and ERDAS IMAGINE. Furthermore, in order to provide more bundle adjustment statistics to be compared, the Damped Bundle Adjustment Toolbox (DBAT) was also used to reprocess the PhotoScan project. Results show that PhotoScan results are less stable than those generated by the two photogrammetric software programmes. This translates to lower accuracy, which may impact the final photogrammetric product.

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Skorobogatova, Anastasia, and Elena Khlebnikova. "POSSIBILITY OF CREATING A DIGITAL ORTHOPHOTO BASED ON AERIAL PHOTOGRAPHY WHILE UPDATING MAPS ON THE TERRITORY OF THE REPUBLIC OF KAZAKHSTAN." Interexpo GEO-Siberia 6, no. 2 (2019): 222–29. http://dx.doi.org/10.33764/2618-981x-2019-6-2-222-229.

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The stages of orthophotoplan creation in the software complex PHOTOMOD Lite and similar functionality of the software complex Agisoft PhotoScan for further research of their application in production as an alternative to the software product of Leica Geosystems "Leica Photogrammetry Suite" are considered.

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Niederheiser, Robert, Martin Mokroš, Julia Lange, Helene Petschko, Günther Prasicek, and Sander Oude Elberink. "DERIVING 3D POINT CLOUDS FROM TERRESTRIAL PHOTOGRAPHS - COMPARISON OF DIFFERENT SENSORS AND SOFTWARE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 16, 2016): 685–92. http://dx.doi.org/10.5194/isprs-archives-xli-b5-685-2016.

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Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. We compare five different sensors as well as four different state-of-the-art software packages for a single application, the modelling of a vegetated rock face. The five sensors represent different resolutions, sensor sizes and price segments of the cameras. The software packages used are: (1) Agisoft PhotoScan Pro (1.16), (2) Pix4D (2.0.89), (3) a combination of Visual SFM (V0.5.22) and SURE (1.2.0.286), and (4) MicMac (1.0). We took photos of a vegetated rock face from identical positions with all sensors. Then we compared the results of the different software packages regarding the ease of the workflow, visual appeal, similarity and quality of the point cloud. While PhotoScan and Pix4D offer the user-friendliest workflows, they are also “black-box” programmes giving only little insight into their processing. Unsatisfying results may only be changed by modifying settings within a module. The combined workflow of Visual SFM, SURE and CloudCompare is just as simple but requires more user interaction. MicMac turned out to be the most challenging software as it is less user-friendly. However, MicMac offers the most possibilities to influence the processing workflow. The resulting point-clouds of PhotoScan and MicMac are the most appealing.

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Niederheiser, Robert, Martin Mokroš, Julia Lange, Helene Petschko, Günther Prasicek, and Sander Oude Elberink. "DERIVING 3D POINT CLOUDS FROM TERRESTRIAL PHOTOGRAPHS - COMPARISON OF DIFFERENT SENSORS AND SOFTWARE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 16, 2016): 685–92. http://dx.doi.org/10.5194/isprsarchives-xli-b5-685-2016.

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Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. We compare five different sensors as well as four different state-of-the-art software packages for a single application, the modelling of a vegetated rock face. The five sensors represent different resolutions, sensor sizes and price segments of the cameras. The software packages used are: (1) Agisoft PhotoScan Pro (1.16), (2) Pix4D (2.0.89), (3) a combination of Visual SFM (V0.5.22) and SURE (1.2.0.286), and (4) MicMac (1.0). We took photos of a vegetated rock face from identical positions with all sensors. Then we compared the results of the different software packages regarding the ease of the workflow, visual appeal, similarity and quality of the point cloud. While PhotoScan and Pix4D offer the user-friendliest workflows, they are also “black-box” programmes giving only little insight into their processing. Unsatisfying results may only be changed by modifying settings within a module. The combined workflow of Visual SFM, SURE and CloudCompare is just as simple but requires more user interaction. MicMac turned out to be the most challenging software as it is less user-friendly. However, MicMac offers the most possibilities to influence the processing workflow. The resulting point-clouds of PhotoScan and MicMac are the most appealing.

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Ramzy Jame, Ahmed e., and Raad Awad Kattan. "The Efficiency Employment of Close-range Photogrammetry to Measure And Model Potholes in Asphalt Pavement." Journal Of Duhok University 23, no. 2 (December 9, 2020): 179–97. http://dx.doi.org/10.26682/sjuod.2020.23.2.19.

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The objective of this study is to measure and model potholes distress in the pavement road surface, which form a major type among several distresses exist in road networks. In this research close-range photogrammetry is used to represent potholes distress, this approach allows converting images of the studied potholes into a 3-D model. Ground control points (GCPs) have to be distributed uniformly to cover the whole measured area helping to solve analytically for the unknown coordinates of the measured area point cloud and acquiring a georeferenced model with known coordinates. Agisoft PhotoScan was used for potholes modelling, which is a user-friendly software that allows for 3- D modelling, producing digital elevation models, point clouds, and orthomosaic. The Agisoft PhotoScan initial assessment test on a model similar in shape to a real pothole reviles that the best accuracy acquired using 8 GCPs distributed regularly to cover the shape of the pothole have a maximum discrepancy of - 2.16cm in Z coordinates of one point. The obtained root mean square errors RMS were ±0.79 ±0.78 ±0.67cm in X, Y, and Z coordinates respectively. In a real pothole modelling tests on two sites and comparing the model check points coordinates with the ground coordinates, the RMS obtained were, ±0.85, ±0.58, ±0.44 cm and ±0.32, ±0.27, ±0.39cm in X, Y and Z coordinates respectively. Both potholes can be classified as high level potholes as their depths are more than 50mm in accordance with known specifications. In volume test carried out on the first model, the Agisoft PhotoScan generated volume was 8413 cm3 confirmed the volume measured with the standard soil test known as sand replacement method which gave a volume of 8311 cm3

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Dhanda, A., G. Scarpa, S. Fai, and M. Santana Quintero. "A WORKFLOW FOR GEOMETRIC COLOUR PHOTOGRAPHY OF PAINTED SURFACES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W11 (May 4, 2019): 469–74. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w11-469-2019.

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Abstract. Colour fidelity is vital when documenting painted surfaces. The 2.5D nature of many painted surfaces makes orthophotos and digital surface models (DSMs) common products of the documentation process. This paper presents a workflow to combine photographic and photogrammetric methods to produce aligned colour and depth (orthophotos and DSMs). First, two photogrammetric software (Agisoft Photoscan and Capturing Reality Reality Capture) were tested to determine if they adjusted the colour data during the processing stages. It was found that Photoscan can produce 16-bit orthophotos without manipulating the data; however, Reality Capture is currently limited to 8-bit results. When capturing a surface using photogrammetry, it is common to use the same data for colour and depth. The presented workflow, however, argues that better colour accuracy can be achieved by capturing the two datasets separately and combining them in photogrammetric software. The workflow is demonstrated through the documentation of an unnamed religious painting from the 17th century.

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Kazharin, Egor V. "CREATION OF A THREE-DIMENSIONAL MODEL OF ARCHITECTURAL STRUCTURE IN AGISOFT PHOTOSCAN." Interexpo GEO-Siberia 6, no. 1 (July 8, 2020): 161–66. http://dx.doi.org/10.33764/2618-981x-2020-6-1-161-166.

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All architectural structures are a subject to periodic surveys and use of photogrammetric methods for these purposes will ensure a reduction in time required to complete the work, required accuracy, as well as ability to fulfill the required measurements on a pair of images in office conditions without additional field visits, which will significantly reduce the cost of implementation of this type of work. In order to solve the problems of building three-dimensional models of such objects, a ground-based photography is used more often. This method of photographing, in comparison with other methods, such as ground-based laser scanning, facade shooting with the help of electronic total stations, seems more affordable, since it does not require the use of expensive equipment, but it makes it possible to build an object model with the specified accuracy. For ground photography it is enough to have a calibrated digital camera, computer and software. The purpose of this work is to study the method of constructing a three-dimensional model of an architectural structure based on photogrammetric processing of images, as well as optimizing the result and demonstrating the operability of the method.

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Hastedt, H., T. Ekkel, and T. Luhmann. "EVALUATION OF THE QUALITY OF ACTION CAMERAS WITH WIDE-ANGLE LENSES IN UAV PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 6, 2016): 851–59. http://dx.doi.org/10.5194/isprsarchives-xli-b1-851-2016.

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The application of light-weight cameras in UAV photogrammetry is required due to restrictions in payload. In general, consumer cameras with normal lens type are applied to a UAV system. The availability of action cameras, like the GoPro Hero4 Black, including a wide-angle lens (fish-eye lens) offers new perspectives in UAV projects. With these investigations, different calibration procedures for fish-eye lenses are evaluated in order to quantify their accuracy potential in UAV photogrammetry. Herewith the GoPro Hero4 is evaluated using different acquisition modes. It is investigated to which extent the standard calibration approaches in OpenCV or Agisoft PhotoScan/Lens can be applied to the evaluation processes in UAV photogrammetry. Therefore different calibration setups and processing procedures are assessed and discussed. Additionally a pre-correction of the initial distortion by GoPro Studio and its application to the photogrammetric purposes will be evaluated. An experimental setup with a set of control points and a prospective flight scenario is chosen to evaluate the processing results using Agisoft PhotoScan. Herewith it is analysed to which extent a pre-calibration and pre-correction of a GoPro Hero4 will reinforce the reliability and accuracy of a flight scenario.

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Hastedt, H., T. Ekkel, and T. Luhmann. "EVALUATION OF THE QUALITY OF ACTION CAMERAS WITH WIDE-ANGLE LENSES IN UAV PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 6, 2016): 851–59. http://dx.doi.org/10.5194/isprs-archives-xli-b1-851-2016.

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The application of light-weight cameras in UAV photogrammetry is required due to restrictions in payload. In general, consumer cameras with normal lens type are applied to a UAV system. The availability of action cameras, like the GoPro Hero4 Black, including a wide-angle lens (fish-eye lens) offers new perspectives in UAV projects. With these investigations, different calibration procedures for fish-eye lenses are evaluated in order to quantify their accuracy potential in UAV photogrammetry. Herewith the GoPro Hero4 is evaluated using different acquisition modes. It is investigated to which extent the standard calibration approaches in OpenCV or Agisoft PhotoScan/Lens can be applied to the evaluation processes in UAV photogrammetry. Therefore different calibration setups and processing procedures are assessed and discussed. Additionally a pre-correction of the initial distortion by GoPro Studio and its application to the photogrammetric purposes will be evaluated. An experimental setup with a set of control points and a prospective flight scenario is chosen to evaluate the processing results using Agisoft PhotoScan. Herewith it is analysed to which extent a pre-calibration and pre-correction of a GoPro Hero4 will reinforce the reliability and accuracy of a flight scenario.

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Verhoeven, Geert. "Taking computer vision aloft - archaeological three-dimensional reconstructions from aerial photographs with photoscan." Archaeological Prospection 18, no. 1 (January 2011): 67–73. http://dx.doi.org/10.1002/arp.399.

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Palestini, C., and A. Basso. "GEOMATICS AS A SURVEY TOOL TO DOCUMENT AND ENHANCE THE CULTURAL AND LANDSCAPED HERITAGE OF THE MONUMENTAL COMPLEXES IN THE MOUNTAINS OF ABRUZZO." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-5/W1 (May 16, 2017): 373–80. http://dx.doi.org/10.5194/isprs-archives-xlii-5-w1-373-2017.

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The themes of the conference provide an opportunity to exchange views on topics of study in which multidisciplinary contributions of geomatics and restoration contribute to the cognitive process aimed at the conservation of cultural Heritage. In this regard, the contribution exposes research aimed at understanding the documentation and the enhancement of unique architectural – landscape patrimony kept in the Abruzzo mountains. It is about the numerous spiritual retreats established by Pietro da Morrone, Pope Celestino V, mounted among unpassable rocky walls, where the architecture blends with its natural environment camouflaging with it. The analysis refers, specifically to the aspects of survey conducted during the years with the aid of integrated methodologies, able to allow the acquisition, management and comparison of the data. The analysis refers, specifically, to recent digital acquisitions involving the development of San Bartolomeo in Legio, on the slopes of Majella near Roccamorice detected with the use of comparative Agisoft Photoscan and Pix4d software, with shots taken with drones of different sizes, able to mount professional photographic cameras and associate to each picture the coordinates Gps of the point of shooting. Follows a confrontation between a survey carried out with 3d laser scanner, Faro Ls1105, and described acquisitions, obtained from ground and from drone with Photoscan, in order to compare the two scans and the metric differences obtained with the two methods.

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Niyazgulov, U. D., F. H. Niyazgulov, and A. V. Krivous. "Investigation of the accuracy of determining the geometry of the railway track using digital images." Herald of the Ural State University of Railway Transport, no. 1 (2021): 55–61. http://dx.doi.org/10.20291/2079-0392-2021-1-55-61.

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Digital infrastructure as an element of the «Digital Railway» of JSC «Russian Railways» involves the provision of objective, complete and up-to-date information about infrastructure facilities in digital form to solve a wide range of tasks - from engineering surveys carried out as part of the construction, repair and reconstruction of railway infrastructure facilities to the operation of autonomous (unmanned) rolling stock. One of the methods of obtaining such information is digital photogrammetry. At the same time, the highest measurement accuracy is required when determining the geometry of the railway track. When determining the geometry of the railway track with high accuracy through digital images, it becomes necessary to take into account not only the parameters of aerial photography and the quality of digital images, but also the features of image processing programs. The article presents the results of experimental studies of the accuracy of determining the geometry of the railway track using digital images as a result of processing them on the digital photogrammetric systems (DFS) PHOTOMOD and Agisoft Metashape (PhotoScan). The technical characteristics (CFS) of PHOTOMOD and Agisoft Metashape (PhotoScan) are given, the goals, objectives and content of the experimental studies performed are considered, the features of the experimental object, the characteristics of the aerial survey equipment and the methods of control determinations are described.

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Yoo, C. I., Y. S. Oh, and Y. J. Choi. "COASTAL MAPPING OF JINU-DO WITH UAV FOR BUSAN SMART CITY, KOREA." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4 (September 19, 2018): 725–29. http://dx.doi.org/10.5194/isprs-archives-xlii-4-725-2018.

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Abstract. For illustrating estuarine and coastal morphology, UAV has proved its effectiveness in providing accurate and diverse information, but unfortunately, no such application have been undertaken for Nakdong River Estuary for ecosystem-based coastal mapping. In this study an attempt has been made to coastal mapping of Jinu-do in Nakdong River Estuary, and to identify beach volume change and vegetation area migration caused by wave and current from 2017 to 2018 with UAV. Unmanned aerial vehicle used for mapping was M600 hexa-copter drone (DJI, china). To create UAV point clouds a standard digital camera can provide imagery with Sony A7 mirror-less camera. Total 34 Ground Control Points (GCPs) accurately surveyed with a RTK-VRS, network use real-time kinematic solutions to provide high-accuracy. Stereo-matching using Agisoft PhotoScan obtained DEM. Using GCPS the vertical accuracy of the DSMs were found to be 5cm or better. Using the PhotoScan, the area of Jinu-do orthophotos were calculated and the area of vegetation calculated using QGIS. As a result, the vegetation area was increased about 5% more than the topography. This study of coastal mapping at Jinu-do demonstrate that the integration of UAV techniques and photogrammetric software and analysis tools can provide new concepts into the estuarine.

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Barbasiewicz, Adrianna, Tadeusz Widerski, and Karol Daliga. "The analysis of the accuracy of spatial models using photogrammetric software: Agisoft Photoscan and Pix4D." E3S Web of Conferences 26 (2018): 00012. http://dx.doi.org/10.1051/e3sconf/20182600012.

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This article was created as a result of research conducted within the master thesis. The purpose of the measurements was to analyze the accuracy of the positioning of points by computer programs. Selected software was a specialized computer software dedicated to photogrammetric work. For comparative purposes it was decided to use tools with similar functionality. As the basic parameters that affect the results selected the resolution of the photos on which the key points were searched. In order to determine the location of the determined points, it was decided to follow the photogrammetric resection rule. In order to automate the measurement, the measurement session planning was omitted. The coordinates of the points collected by the tachymetric measure were used as a reference system. The resulting deviations and linear displacements oscillate in millimeters. The visual aspects of the cloud points have also been briefly analyzed.

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Tucci, G., V. Bonora, A. Conti, and L. Fiorini. "Benchmarking Range-Based and Image-Based Techniques for Digitizing a Glazed Earthenware Frieze." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-5/W3 (August 12, 2015): 315–22. http://dx.doi.org/10.5194/isprsannals-ii-5-w3-315-2015.

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3D high resolution models can be produced both using range-based and image-based techniques. In this work, we evaluate the performance of the Photoscan commercial software in a challenging project: the digitization of an earthenware frieze of about 36 m in length. In order to choose the most effective technique and to define the best workflow for on-the-field data acquisition and the subsequent data elaboration, some tests were performed on a portion of the frieze. We discuss the results and compare the models resulting from different workflows with a reference data set taken from the scan data.

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Ćurčin, Dragica. "REKONSTRUKCIJA HRANE ZA POTREBE ARHITEKTONSKE VIZUALIZACIJE." Zbornik radova Fakulteta tehničkih nauka u Novom Sadu 35, no. 04 (March 28, 2020): 732–35. http://dx.doi.org/10.24867/07fa05curcin.

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U ovom radu analiziran je problem kreiranja hrane za potrebe arhitektonske vizuelizacije. Poređenjem dve metode, rekonstrukcijom modela korišćenjem automatskog programa AgiSoft Photoscan-a i modelovanje hrane u nekom od programa za 3D modelovanje, razmotrene su mane i prednosti ovih metoda. Prilikom kreiranja scene za potrebe arhitektonske vizualizacije, potrebno je da scena izgleda što realističnije, stoga se dodavanjem objekta kao što je hrana dobija takav efekat. Kako bi model bio zadovoljavajući, potrebno je obratiti pažnju na detalje kao i na samu teksturu objekta, takođe treba voditi računa o broju poligona, kako ne bi došlo do problema prilikom uklapanja modela u scenu.

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Li, Xiu quan, Zhu an Chen, Li ting Zhang, and Dan Jia. "Construction and Accuracy Test of a 3D Model of Non-Metric Camera Images Using Agisoft PhotoScan." Procedia Environmental Sciences 36 (2016): 184–90. http://dx.doi.org/10.1016/j.proenv.2016.09.031.

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Anders, Niels, João Valente, Rens Masselink, and Saskia Keesstra. "Comparing Filtering Techniques for Removing Vegetation from UAV-Based Photogrammetric Point Clouds." Drones 3, no. 3 (July 30, 2019): 61. http://dx.doi.org/10.3390/drones3030061.

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Digital Elevation Models (DEMs) are 3D representations of the Earth’s surface and have numerous applications in geomorphology, hydrology and ecology. Structure-from-Motion (SfM) photogrammetry using photographs obtained by unmanned aerial vehicles (UAVs) have been increasingly used for obtaining high resolution DEMs. These DEMs are interpolated from point clouds representing entire landscapes, including points of terrain, vegetation and infrastructure. Up to date, there has not been any study clearly comparing different algorithms for filtering of vegetation. The objective in this study was, therefore, to assess the performance of various vegetation filter algorithms for SfM-obtained point clouds. The comparison was done for a Mediterranean area in Murcia, Spain with heterogeneous vegetation cover. The filter methods that were compared were: color-based filtering using an excessive greenness vegetation index (VI), Triangulated Irregular Networks (TIN) densification from LAStools, the standard method in Agisoft Photoscan (PS), iterative surface lowering (ISL), and a combination of iterative surface lowering and the VI method (ISL_VI). Results showed that for bare areas there was little to no difference between the filtering methods, which is to be expected because there is little to no vegetation present to filter. For areas with shrubs and trees, the ISL_VI and TIN method performed best. These results show that different filtering techniques have various degrees of success in different use cases. A default filter in commercial software such as Photoscan may not always be the best way to remove unwanted vegetation from a point cloud, but instead alternative methods such as a TIN densification algorithm should be used to obtain a vegetation-less Digital Terrain Model (DTM).

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Aati, Saif, Ewelina Rupnik, and Samir Nejim. "Comparative study of photogrammetry software in industrial field." Revue Française de Photogrammétrie et de Télédétection 1, no. 221 (March 2, 2020): 37–48. http://dx.doi.org/10.52638/rfpt.2019.439.

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Cet article présente une étude comparative entre des logiciels de photogrammétrie capables de traiter automatiquement plusieurs images pour générer un nuage de point dans le domaine industriel. Par conséquent, différents jeux de données industrielles sont utilisés, chacun présentant un nombre varié : d'images, de résolutions et d'objets d'intérêt avec différents niveaux de complexité industrielle. Cette étude vise à évaluer la performance de six solutions de photogrammétrie (Agisoft PhotoScan, Pix4DMapper Pro, RealityCapture, MicMac, Reacap Photo, Context Capture) en reconstruction 3D de scènes complexes dans le domaine industriel. De plus, les principaux aspects étudiés sont la précision de l'orientation des images, la qualité et la précision du nuage de points généré.

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Skripka, Grigory, Olga Ivlieva, Lyudmila Bespalova, Anton Filatov, and Vladislav Saprygin. "Monitoring of dangerous shore processes of Tsimlyansk Reservoir using GIS-technologies." InterCarto. InterGIS 26, no. 2 (2020): 253–63. http://dx.doi.org/10.35595/2414-9179-2020-2-26-253-263.

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In the article, the degree of displaying dangerous exogenetic geological processes (abrasion, landslide, erosion) of the Tsimlyansk Reservoir at the present stage of reforming its shores is assessed. A new original methodology for monitoring morphological and morphometrical characteristics of different shore types of the reservoir, using unmanned aerial vehicles (UAV) and Agisoft Photoscan tooling is proposed. For a number of shore sections of the Tsimlyansk reservoir, assessment of consequence for stirring up abrasion activity being expressed in stepping back the edge of shore steeps and reducing land fund is carried out. In the automated information system of water bodies state monitoring, a compulsory index is monitoring of erosion dismemberment. Methods to carry out erosion processes monitoring in water protection zones (WPZ) of water bodies using software and apparatus complex, created on the base of UAVs and GIS-technologies are developed and tested, an optimal type of digital elevation models (DEM) for assessing erosion network density is determined. Based on series of photographs carried out by UAVs by the DEMs and orthophotomaps, created using Agisoft Photoscan software, the relief erosion forms are determined. Morphometrical characteristics of the relief erosion forms are also measured, the erosion network density (K) for a number of plots in the water protection zones of the Tsimlyansk Reservoir coast is determined. In the protection zone of the Tsimlyansk Reservoir, comprehensive analysis is carried out, assessment of demographic load on the coastal area of the reservoir is conducted. Territorial zoning according to the degree of demographic load is carried out and it will allow in the future to organize planning timely measures for protecting coastal zones. The results obtained in the course of work allowed to make conclusions for the sections of the reservoir water protection zone most subject to anthropogenic activity and to propose a package of measures for its reducing.

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Wojciechowska, Gabriela, and Jakub Łuczak. "Use of close-range photogrammetry and UAV in documentation of architecture monuments." E3S Web of Conferences 71 (2018): 00017. http://dx.doi.org/10.1051/e3sconf/20187100017.

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The available photogrammetric solutions, combined with properly conducted surveying measurements enable to create fully applicable, three-dimensional models of architectural structures, which can be applied in, i.e. protection of cultural heritage or conservational documentation. Currently, we can see an increase in use of digital non-metric cameras in a photogrammetric inventory of sacred monuments. Properly obtained and analysed data allow to create a digital model of an object, which later might serve as a basis for a vector image used for architectural and construction purposes. The paper presents the procedure of creation of 3D models of sacred historic monuments of relatively small sizes with the use of terrestrial photogrammetry and UAV using the Agisoft PhotoScan Professional software.

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Simonelli, Laís, Arivaldo Leão de Amorim, and Natalie Johanna Groetelaars. "Documentação da volumetria de edificações históricas através de nuvens de pontos: um experimento no Pelourinho, em Salvador na Bahia." Research, Society and Development 9, no. 2 (January 1, 2020): e174922268. http://dx.doi.org/10.33448/rsd-v9i2.2268.

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Neste trabalho, foi proposto um fluxo de processos para construção dos modelos geométricos de um conjunto de edificações localizadas no Pelourinho, em Salvador na Bahia. O fluxo de trabalho para construção dos modelos texturizados em SketchUP, demandou a aquisição de imagens aéreas e terrestres das edificações, a geração de nuvens de pontos e ortofotos por processos fotogramétricos no Photoscan, o tratamento das ortofotos no Photoshop, e por fim, a produção de seções das nuvens de pontos no AutoCAD. As etapas definidas para a construção dos modelos geométricos possibilitaram que o objetivo fosse atingido. No entanto, novas metodologias precisam ser desenvolvidas e aperfeiçoadas para simplificar os processos, reduzindo o emprego de mão de obra e o tempo de processamento.

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Yanagi, H., and H. Chikatsu. "PERFORMANCE EVALUATION OF 3D MODELING SOFTWARE FOR UAV PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 147–52. http://dx.doi.org/10.5194/isprsarchives-xli-b5-147-2016.

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UAV (Unmanned Aerial Vehicle) photogrammetry, which combines UAV and freely available internet-based 3D modeling software, is widely used as a low-cost and user-friendly photogrammetry technique in the fields such as remote sensing and geosciences. In UAV photogrammetry, only the platform used in conventional aerial photogrammetry is changed. Consequently, 3D modeling software contributes significantly to its expansion. However, the algorithms of the 3D modelling software are black box algorithms. As a result, only a few studies have been able to evaluate their accuracy using 3D coordinate check points. With this motive, Smart3DCapture and Pix4Dmapper were downloaded from the Internet and commercial software PhotoScan was also employed; investigations were performed in this paper using check points and images obtained from UAV.

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Erghelegiu, Bogdan, Alexandra Trif, Raluca-Margareta Manea, and Alexandru Boască. "The Restoration and Remodelling of Facades – A Permanent Necessity for the Conservation of History." “Agriculture for Life, Life for Agriculture” Conference Proceedings 1, no. 1 (July 1, 2018): 383–86. http://dx.doi.org/10.2478/alife-2018-0057.

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Abstract The article presents a way of remodeling old building facades, which have been subject to degradation, with the help of common software. There are two methods of reconstruction presented: the first method is using the Adobe Photoshop software and the second method is using the Agisoft PhotoScan software. A comparative study is presented, by showing the advantages and disadvantages of methods, as well as their similarities and differences. The building that is the subject of the study is one of the oldest buildings belonging to the university. It is noted that by combining modern technology (aerial scanning) and common software solutions, there can be found a fast and reliable response to the need for restoration and conservation of historical buildings.

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Yanagi, H., and H. Chikatsu. "PERFORMANCE EVALUATION OF 3D MODELING SOFTWARE FOR UAV PHOTOGRAMMETRY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 15, 2016): 147–52. http://dx.doi.org/10.5194/isprs-archives-xli-b5-147-2016.

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UAV (Unmanned Aerial Vehicle) photogrammetry, which combines UAV and freely available internet-based 3D modeling software, is widely used as a low-cost and user-friendly photogrammetry technique in the fields such as remote sensing and geosciences. In UAV photogrammetry, only the platform used in conventional aerial photogrammetry is changed. Consequently, 3D modeling software contributes significantly to its expansion. However, the algorithms of the 3D modelling software are black box algorithms. As a result, only a few studies have been able to evaluate their accuracy using 3D coordinate check points. With this motive, Smart3DCapture and Pix4Dmapper were downloaded from the Internet and commercial software PhotoScan was also employed; investigations were performed in this paper using check points and images obtained from UAV.

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Fissore, F., A. Guarnieri, and A. Vettore. "DIGITAL MODEL OFWALLS OF PADUA LOWRELIEF." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W8 (November 13, 2017): 95–98. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w8-95-2017.

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Photogrammetry has been widely used in the recent years in a number of applications, e.g. cultural heritage, surveying buildings and infrastructures. Despite nowadays its use is quite common, most of the used photogrammetric softwares are commercial. This paper aims at comparing the use of a free Matlab tool that is being developed at the University of Padova mostly for educational purposes with that of a commercial (and widely used) software (Agisoft PhotoScan). Despite the above mentioned free Matlab tool is designed to work for airborne photogrammetric, in this work it is used in a slightly different case: the 3D reconstruction of a low relief of the walls of Padova, which is on the fac¸ade of the church Santa Maria del Giglio, Venice, Italy.

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Kaimaris, Dimitris, Petros Patias, and Maria Sifnaiou. "UAV and the comparison of image processing software." International Journal of Intelligent Unmanned Systems 5, no. 1 (January 3, 2017): 18–27. http://dx.doi.org/10.1108/ijius-12-2016-0009.

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Purpose The purpose of this paper is to discuss unmanned aerial vehicle (UAV) and the comparison of image processing software. Design/methodology/approach Images from a drone are used and processed with new digital image processing software, Imagine UAV® of Erdas imagine 2015®. The products (Digital Surface Model and ortho images) are validated with check points (CPs) measured in the field with Global Positioning System. Moreover, similar products are produced by Agisoft PhotoScan® software and are compared with both the products of Imagine UAV and the CPs. Findings The results reveal that the two software tools are almost equivalent, while the accuracies of their products are similar to the accuracies of the external orientations of drone images. Originality/value Comparison of image processing software.

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Karimi, Sadegh, and Ehsan Khorrambakht. "A Photogrammetric Method for Spatial Data Extraction from Google Earth and Improvement with Precision Analysis." Civil Engineering Journal 4, no. 4 (May 3, 2018): 886. http://dx.doi.org/10.28991/cej-0309141.

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Topography maps are crucial for civil engineering projects, such as road construction, water channel construction, urban construction, and mining. Here we present a method which enables us to extract topographical map via modeling Google Earth and some field works. In this method, first, we model Google Earth as an object with closed-range photogrammetric method in the Agisoft Photoscan. Through some field works, we measured twenty-two points including twelve ground control points (GCP) and ten independent check points (ICP). Due to these GCPs, we were able to transform our model to real world with global polynomial and multi-quadratic equations and ICPs were used for precision analysis. This method is easy and cheap to obtain spatial data and the accuracy is sufficient for research requirements.

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De Moura, Rafael Veloso, Antônio Lazáro Ferreira Santos, and Leomar Rufino Alves Junior. "Mapeamento da Voçoroca Contorno em Anápolis–GO por Meio de Geotecnologias / Mapping of the Contour Voçoroca in Anápolis-GO through Geotechnologies." Brazilian Applied Science Review 5, no. 2 (April 7, 2021): 1002–12. http://dx.doi.org/10.34115/basrv5n2-028.

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A erosão pode atingir todos os tipos de terrenos, terrosos ou rochosos, tanto em meio rural quanto urbano. Cronologicamente a erosão superficial desenvolve-se para sulcos, ravinas e voçorocas, ocorrendo neste último estágio o afloramento de água do lençol freático.. Foi escolhida para ser mapeada a Voçoroca Contorno, localizada na porção sudoeste da cidade de Anápolis, situada no estado de Goiás. Há no mercado diversos métodos que utilizam geotecnologias aplicados em áreas de erosões, neste trabalho empregou-se o Drone como ferramenta para a realizaçao dos aerolevantametos e utilizou-se o software Photoscan® para o processamento digital das aerofotografias, produzindo como resultados o MDS (Modelo Digital de Superfície), o MDT (Modelo Digital do Terreno), o ortomosaico e as curvas de níveis do terreno.

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Gligora, Valerija, and Andrej Janeš. "Primjena 3D digitalizacije kulturne baštine." Portal, no. 11 (2021): 181–90. http://dx.doi.org/10.17018/portal.2020.11.

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Pri iskopavanju 1999. godine provedenom oko ostataka pročelja crkve cistercitske opatije, čiji se ostaci nalaze u parku Opatovina u Topuskom, pronađena je veća količina kamenih komada arhitektonskih elemenata. Tijekom 2018. godine provedeno je dokumentiranje pronađenih arhitektonskih elemenata s pomoću 3D modeliranja. Razvojem tehnologije devedesetih godina 20. stoljeća 3D modeli počinju se primjenjivati u arheologiji i postaju sve popularniji. Danas u arheologiji razlikujemo dva pojma vezana uz 3D modeliranje: 3D digitalizaciju i 3D rekonstrukciju. Arhitektonski elementi iz Topuskog fotografirani su u svrhu izrade 3D modela temeljenog na fotografijama, što se smatra 3D digitalizacijom (modeli su napravljeni u programu Agisoft Photoscan). Tlocrti, bočni pogledi i presjeci „eksportirani“ su iz programa u obliku ortomozaika te su poslužili kao temelj za izradu nacrtne dokumentacije.

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Chibunichev, A. G., V. M. Kurkov, A. V. Smirnov, A. V. Govorov, and V. A. Mikhalin. "INVESTIGATION OF PHOTOTRIANGULATION ACCURACY WITH USING OF VARIOUS TECHNIQUES LABORATORY AND FIELD CALIBRATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (October 12, 2016): 1227–33. http://dx.doi.org/10.5194/isprs-archives-xli-b1-1227-2016.

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Nowadays, aerial survey technology using aerial systems based on unmanned aerial vehicles (UAVs) becomes more popular. UAVs physically can not carry professional aerocameras. Consumer digital cameras are used instead. Such cameras usually have rolling, lamellar or global shutter. Quite often manufacturers and users of such aerial systems do not use camera calibration. In this case self-calibration techniques are used. However such approach is not confirmed by extensive theoretical and practical research. In this paper we compare results of phototriangulation based on laboratory, test-field or self-calibration. For investigations we use Zaoksky test area as an experimental field provided dense network of target and natural control points. Racurs PHOTOMOD and Agisoft PhotoScan software were used in evaluation. The results of investigations, conclusions and practical recommendations are presented in this article.

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Marčiš, Marián. "Quality of 3D Models Generated by SFM Technology." Slovak Journal of Civil Engineering 21, no. 4 (December 1, 2013): 13–24. http://dx.doi.org/10.2478/sjce-2013-0017.

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Abstract Using various types of automation in digital photogrammetry is associated with questions such as the accuracy of a 3D model generated on various types of surfaces and textures, the financial costs of the equipment needed, and also the time costs of the processing. This topic deals with the actual technology of computer vision, which allows the automated exterior orientation of images, camera calibration, and the generation of 3D models directly from images of the object itself, based on the automatic detection of significant points. Detailed testing is done using the Agisoft PhotoScan system, and the camera configuration is solved with respect to the accuracy of the 3D model generated and the time consumption of the calculations for the different types of textures and the different settings for the processing.

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Barrile, V., G. Bilotta, and A. Nunnari. "3D MODELING WITH PHOTOGRAMMETRY BY UAVS AND MODEL QUALITY VERIFICATION." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences IV-4/W4 (November 13, 2017): 129–34. http://dx.doi.org/10.5194/isprs-annals-iv-4-w4-129-2017.

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This paper deals with a test lead by Geomatics laboratory (DICEAM, Mediterranea University of Reggio Calabria), concerning the application of UAV photogrammetry for survey, monitoring and checking. The study case relies with the surroundings of the Department of Agriculture Sciences. In the last years, such area was interested by landslides and survey activities carried out to take the phenomenon under control. For this purpose, a set of digital images were acquired through a UAV equipped with a digital camera and GPS. Successively, the processing for the production of a 3D georeferenced model was performed by using the commercial software Agisoft PhotoScan. Similarly, the use of a terrestrial laser scanning technique allowed to product dense cloud and 3D models of the same area. To assess the accuracy of the UAV-derived 3D models, a comparison between image and range-based methods was performed.

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Khlebnikova, Tatyana, and Symbat Aubakirova. "DEVELOPMENT OF THE TECHNIQUE FOR CREATING THREE-DIMENSIONAL VIDEO SCENES WHILE BUILDING OBJECTS OF CHEMICAL ENTERPRISES ON TERRITORIES OF KAZAHSTAN." Interexpo GEO-Siberia 1, no. 1 (2019): 259–64. http://dx.doi.org/10.33764/2618-981x-2019-1-1-259-264.

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The article is devoted to some issues concerning the improvement of techniques for stages control, while building the objects of chemical enterprises on territories in Kazakhstan. Nowadays, one of the types of control is the one through single photographs obtained by means of digital cam-eras. But, even visual inspection of the entire object is not possible with the application of single im-ages. The authors suggest to conduct aerial photographic survey of an object, photogrammetric im-ages processing, the object or the local areas 3D-model design while performing any work stage or its completion. The Agisoft PhotoScan Programme for experimental studies was chosen. The survey was carried out with Huawei Nova 2i RNE-L21 Graphite Black smartphone. As a result, due to to-photogrammetric images processing, the point digital model, providing visual object correctness was obtained.

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Singh, S. P., K. Jain, and V. R. Mandla. "Image based 3D city modeling : Comparative study." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-5 (June 6, 2014): 537–46. http://dx.doi.org/10.5194/isprsarchives-xl-5-537-2014.

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3D city model is a digital representation of the Earth’s surface and it’s related objects such as building, tree, vegetation, and some manmade feature belonging to urban area. The demand of 3D city modeling is increasing rapidly for various engineering and non-engineering applications. Generally four main image based approaches were used for virtual 3D city models generation. In first approach, researchers were used Sketch based modeling, second method is Procedural grammar based modeling, third approach is Close range photogrammetry based modeling and fourth approach is mainly based on Computer Vision techniques. SketchUp, CityEngine, Photomodeler and Agisoft Photoscan are the main softwares to represent these approaches respectively. These softwares have different approaches & methods suitable for image based 3D city modeling. Literature study shows that till date, there is no complete such type of comparative study available to create complete 3D city model by using images. This paper gives a comparative assessment of these four image based 3D modeling approaches. This comparative study is mainly based on data acquisition methods, data processing techniques and output 3D model products. For this research work, study area is the campus of civil engineering department, Indian Institute of Technology, Roorkee (India). This 3D campus acts as a prototype for city. This study also explains various governing parameters, factors and work experiences. This research work also gives a brief introduction, strengths and weakness of these four image based techniques. Some personal comment is also given as what can do or what can’t do from these softwares. At the last, this study shows; it concluded that, each and every software has some advantages and limitations. Choice of software depends on user requirements of 3D project. For normal visualization project, SketchUp software is a good option. For 3D documentation record, Photomodeler gives good result. For Large city reconstruction; CityEngine is a good product. Agisoft Photoscan software creates much better 3D model with good texture quality and automatic processing. So this image based comparative study is useful for 3D city user community. Thus this study will provide a good roadmap for geomatics user community to create photo-realistic virtual 3D city model by using image based techniques.

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Przybilla, H. J., M. Gerke, I. Dikhoff, and Y. Ghassoun. "INVESTIGATIONS ON THE GEOMETRIC QUALITY OF CAMERAS FOR UAV APPLICATIONS USING THE HIGH PRECISION UAV TEST FIELD ZOLLERN COLLIERY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2/W13 (June 4, 2019): 531–38. http://dx.doi.org/10.5194/isprs-archives-xlii-2-w13-531-2019.

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Abstract. The geodetic-photogrammetric test field at the industrial monument Zollern colliery in Dortmund offers a scenario for carrying out geometric and radiometric tests of UAV systems. The foundation for this builds a geodetic precision network (position and height accuracy approx. 2&thinsp;mm) with a total of 45 ground control points, distributed over an area of approx. 7 hectares. Within the scope of a campaign carried out in autumn 2017, various UAV sensor systems were tested under comparable conditions. Within this paper geometric investigations of two current DJI cameras, Zenmuse X4S (20 Mpix) and X5S (20.8 Mpix), as well as a Phase One IXU 1000 (100 Mpix) are presented. While the Zenmuse cameras reflect the current state of development of the manufacturer DJI, the medium format camera system from Phase One is primarily settled in the classic aerial segment. However, the desire for increased measurement accuracy (e. g. for engineering applications) also makes such a high-performance sensor interesting for UAV applications. In addition to the configuration of the test field, the system comparison requires identical parameters for flight planning, in particular image overlapping, a complete cross flight configuration at different flight altitudes and the definition of a uniform ground resolution (GSD&thinsp;=&thinsp;14&thinsp;mm).The investigations show clear differences in the achievable quality of the cameras. Though the high-priced Phase One system shows the best results, the most cost-effective system, the Zenmuse X4S, delivers only slightly worse results. In contrast, the Zenmuse X5S performs significantly worse than the other systems, mainly resulting from the mechanically unstable camera concept with interchangeable lenses. Finally, the comparison of the software products Pix4D Pix4Dmapper, Inpho UASMaster by Trimble and Agisoft PhotoScan partly shows significant differences in the results of image orientation. In particular in settings with sparse GCP usage the results vary considerably, indicating different strategies on how the residuals are distributed and the datum is defined, mostly Pix4Dmapper outperforms the others. In better GCP configurations there is no significant difference between Pix4mapper and Agisoft PhotoScan, while UASMaster does never deliver the best results.

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Jullyantari, Ni Luh Putu, I. Made Anom Sutrisna Wijaya, and I. Putu Gede Budisanjaya. "Pendugaan Intensitas Serangan Penyakit BLB (Bacterial Leaf Blight) pada Tanaman Padi menggunakan Pendekatan Citra Termal." Jurnal BETA (Biosistem dan Teknik Pertanian) 9, no. 1 (April 30, 2021): 86. http://dx.doi.org/10.24843/jbeta.2021.v09.i01.p09.

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Penyakit BLB merupakan salah satu penyakit yang berbahaya bagi tanaman padi. Penyakit ini biasanya menyerang di setiap fase pertumbuhan. Perhitungan intensitas serangan penyakit BLB masih dilakukan secara manual. Pengembangan teknologi dalam pendugaan intensitas serangan penyakit BLB sangat diperlukan. Penelitian ini bertujuan untuk membangun persamaan pendugaan intensitas serangan penyakit BLB menggunakan pendekatan citra termal. Penelitian ini menggunakan Drone DJI Inspire 1 dengan kamera termal DJI Zenmuse XT. Pengolahan data menggunakan software Agisoft Photoscan, Arcgis 10.3 dan Microsoft Excel. Dari hasil analisis citra termal diperoleh bahwa persamaan pendugaan intensitas serangan adalah y = 4.9533x-144.42 dan akurasi pendugaannya tinggi yaitu 90,45% dengan nilai eror 8,43%. Suhu kanopi dapat diklasifikasi menjadi empat sesuai dengan intensitas serangan yaitu 29,83-31,84oC untuk intensitas serangan ringan, 31,85-34,39oC untuk intensitas serangan sedang, 34,40-43,52oC untuk intensitas serangan berat dan 43,53-48,09oC untuk intensitas serangan puso. Berdasarkan hasil dari penelitian yang telah dilakukan dapat disimpulkan bahwa pendekatan citra termal dapat digunakan untuk menduga intensitas serangan penyakit BLB pada tanaman padi. Bacterial Leaf Blight (BLB) is a dangerous disease for rice plants. This disease can attack in every phase of growth. Calculation of BLB disease attack intensity is currently still done manually. Technology development in estimating the intensity of BLB disease is very necessary. This study aims to establish the equation for estimating BLB disease intensity using a thermal image approach. Drone DJI Inspire 1 with a thermal camera DJI Zenmuse XT was used in this research. Processing data using software Agisoft Photoscan, Arcgis 10.3 and Microsoft Excel. From the results of the thermal image analysis, it was found that the equation for estimating attack intensity is y = 4.9533x-144.42 and estimation accuracy is high at 90,45% with an error value of 8,43%. Temperature of the canopy can be classified into four according to the intensity of the attack, namely 29,83-31,84oC for mild attack intensity, 31,85-34,39oC for moderate attack intensity, 34,40-43,52oC for intensity of severe attacks and 43,53-48,09oC for intensity of puso attacks. From these results it can be concluded that the thermal image approach can be used to estimate BLB disease attacks on rice plants.

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Fiorillo, Fausta, Marco Limongiello, and Belén Jiménez Fernández-Palacios. "Testing GoPro for 3D model reconstruction in narrow spaces." ACTA IMEKO 5, no. 2 (September 1, 2016): 64. http://dx.doi.org/10.21014/acta_imeko.v5i2.372.

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The main objective of this paper is to analyse the potential as well as the limitations of an action camera (GoPro Hero 3 Black) in photogrammetric application for architectural cultural heritage reconstruction. The investigations were carried out in a site of notable historical interest, “Villa Giulia Felice” in Pompeii, Italy. In order to estimate the work pipeline, the time-consuming processing and the output product accuracy using fisheye camera images, three commercial image processing software packages were tested: Agisoft PhotoScan, Pix4Dmapper and 3DF Zephyr Aerial. Several comparisons among the final 3D models produced have been developed and the results achieved. Despite the problems found related to lens distortion and the small distance from the camera to the object (average distance ~80 cm), the test has provided good results in terms of accuracy (average error 2 - 3.5 cm) and reliability.

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Moosina, Guzialia, Dmitriy Ozhigin, and Svetlana Ozhigina. "ENVIROMENTAL MONITORING ON THE BASES OF THE PICTURES RECEIVED BY OF PILOTLESS FLYING DEVICES." Interexpo GEO-Siberia 4, no. 2 (2019): 196–204. http://dx.doi.org/10.33764/2618-981x-2019-4-2-196-204.

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Results of environmental monitoring of a coal section in the territory of the Republic of Kazakhstan on the basis of satellite data (the seasonal temporary Landsat 4-5, 7, 8 series (ETM, OLI)) and pictures from the pilotless flying device are presented in this article.This monitoring is when using spectrally - the dynamic signs taken from temporary series of values of vegetative indexes (NDVI) from 2002 for 2016, for 2019 from the unmanned aerial vehicle.For realization of this process the program PhotoScan 1.2 and QGis3.6 complexes are used. The presented methods of remote sensing of the earth allow: to expand possibilities of environmental monitoring due to increase in frequency of obtaining relevant information; obtaining images of high quality; information processing in short terms by various indexes.The research confirms that increase in acreage, the mineral deposits broken by open mining operations when developing, negatively influences change of indicators of the vegetative NDVI index.

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Dlesk, Adam, Karel Vach, and Karel Pavelka. "STRUCTURE FROM MOTION PROCESSING OF ANALOGUE IMAGES CAPTURED BY ROLLEI METRIC CAMERA, DIGITIZED WITH VARIOUS SCANNING RESOLUTION." Acta Polytechnica 60, no. 4 (September 1, 2020): 288–302. http://dx.doi.org/10.14311/ap.2020.60.0288.

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SfM processing of archived analogue images gives an opportunity to efficiently create new and valuable 2D and 3D results. The SfM processing of digitized analogue images brings some challenges. How to digitize negatives of photogrammetric images? What scanning resolution is the most beneficial for processing? How to preprocess the digitized images to be able to process them using the SfM method? What accuracy of results is possible to expect? This paper tries to deal with all these questions. For this paper, 7 negatives of former photogrammetric documentation of a vault were chosen. The negatives were captured by Rollei 3003 metric camera in 1999. Two pieces of software were chosen for the SfM processing. A commercial alternative Agisoft PhotoScan and free open-source alternative MicMac. The results of the SfM processing were compared to the results of an original photogrammetric method, which was used for former processing in 1999.

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Dolotov, Vyacheslav V., Yuri N. Goryachkin, and Andrey V. Dolotov. "Analysis of the current state of unstable geomorphological structures with modern methods." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 13, no. 1 (April 1, 2020): 195–99. http://dx.doi.org/10.24057/2071-9388-2019-20.

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The paper gives results of the digitization of the status and spatial position of a cliff in the Western Crimea coastal zone. The modern equipment and methods accelerate the survey from the time perspective and improve the quality of the outcomes; namely a high precision GNSS receiver in RTK mode and PHANTOM-3 PRO copter. The digital terrain model was generated with used the Agisoft Photoscan software. The paper shows that the precision of the mathematical model of the relief constructed by aerial photographs provides more detailed data in comparison to those obtained in the field observations. Furthermore, aerial photography makes it possible to calculate the number of spatial characteristics of hazardous for surveying and latent natural objects out of reach for an on-location investigation. As a result, the very detailed data about current condition of dangerous cliff were obtained. The paper also evaluates the linear and volumetric characteristics of cleavages that are prone to collapse.

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Alizadehashrafi, B., and A. Abdul-Rahman. "USING AFFORDABLE DATA CAPTURING DEVICES FOR AUTOMATIC 3D CITY MODELLING." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W6 (November 13, 2017): 9–13. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w6-9-2017.

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In this research project, many movies from UTM Kolej 9, Skudai, Johor Bahru (See Figure 1) were taken by AR. Drone 2. Since the AR drone 2.0 has liquid lens, while flying there were significant distortions and deformations on the converted pictures of the movies. Passive remote sensing (RS) applications based on image matching and Epipolar lines such as Agisoft PhotoScan have been tested to create the point clouds and mesh along with 3D models and textures. As the result was not acceptable (See Figure 2), the previous Dynamic Pulse Function based on Ruby programming language were enhanced and utilized to create the 3D models automatically in LoD3. The accuracy of the final 3D model is almost 10 to 20 cm. After rectification and parallel projection of the photos based on some tie points and targets, all the parameters were measured and utilized as an input to the system to create the 3D model automatically in LoD3 in a very high accuracy.

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Molero Alonso, Borja, Salvatore Barba, and Antonio Álvaro Tordesillas. "Documentación del patrimonio cultural. Método basado en la fusión de técnicas fotogramétricas y de escaneado óptico de triangulación." EGA. Revista de expresión gráfica arquitectónica 21, no. 28 (September 29, 2016): 236. http://dx.doi.org/10.4995/ega.2016.6308.

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Los continuos avances en los últimos años de equipos de levantamiento tridimensional han aumentado el abanico de posibilidades para el registro, documentación y difusión del patrimonio. Pero, y desde esta hipótesis partimos, aún existen obstáculos para la creación de modelos 3D fotorrealísticos y fidedignos en algunos ámbitos geométricos y radiométricos. Estos aparecen cuando las características de las piezas son adversas para su digitalización, es decir, la geometría del objeto carece de aristas definidas y/o su acabado no permite su registro, bien por su color, uniformidad, reflectancia, etc. Este estudio plantea y presenta resultados de un modelo fotorrealístico aplicado al levantamiento de una escultura de Jorge Oteiza. Obra caracterizada por una geometría y textura desfavorables a las ideales para su digitalización. La solución planteada pasa por una metodología fundamentada en la combinación de técnicas: modelos capturados mediante escáner óptico de triangulación Artec con el apoyo del software fotogramétrico PhotoScan en la fase de texturización.

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Silva, Matheus Lisboa Nobre da, Marcos Antonio Leite do Nascimento, Kátia Leite Mansur, and Getson Luís Dantas de Medeiros. "Uso de fotogrametria digital na elaboração de modelos tridimensionais com aplicação em geoconservação e educação." Terrae Didatica 15 (September 10, 2019): e019031. http://dx.doi.org/10.20396/td.v15i0.8655364.

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O uso de novas tecnologias pode ser uma ferramenta lúdica bastante útil em ações educativas nas geociências, colaborando também com a geoconservação de locais que se configurem como patrimônio geológico. Neste sentido, este trabalho utiliza a fotogrametria digital, um método simples e barato de geração de objetos tridimensionais, para obter um modelo digital de um geossítio na área do Projeto Geoparque Seridó. Foram utilizadas 229 fotografias obtidas com uma câmera Nikon P520, além de imagens aéreas do Geossítio Morro do Cruzeiro, capturadas com o uso de drone Phantom 3 Profissional. Os arquivos digitais foram processados no software Agisoft PhotoScan 1.4.1, que utiliza pontos de semelhança entre as fotografias para fazer o posicionamento das imagens e gerar, a partir delas, um modelo em três dimensões que foi, posteriormente, impresso em impressora 3D. Tal modelo possui diversas possibilidades de aplicação em sala de aula ou em ações de conservação da natureza, como subsídio para educação ambiental.

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Nasution, Muhammad Arif. "PEMETAAN EKOSISTEM PADANG LAMUN BERESOLUSI TINGGI DENGAN METODE CLOSE RANGE PHOTOGRAMMETRY." JURNAL PERIKANAN TROPIS 6, no. 2 (October 1, 2019): 57. http://dx.doi.org/10.35308/jpt.v6i2.2182.

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Several remote sensing methods using satellite imagery and acoustic instruments have often been used in mapping aquatic ecosystems but expensive and need hight expertise. This method used in this study is quite new in mapping aquatic ecosystems, but has often been done in mapping terrestrial areas. This method produces clear high-resolution digital data using optical devices with high efficiency. This research was carried out in Pulau Matahari, Kepualauan Banyak, Aceh Singkil for 3 (three) months in the field and 2 (two) months of data processing. This research data is in situ primary data taken by taking optical images continuously from the surface of the water by swimmer using a waterproof digital camera and then processed with PhotoScan software. The results of this study are high-resolution digital image data that can be used to make seagrass ecosystems map at the study site, assess ecosystem status, identify seagrass species ( 4 species), density (St1:103,9 ind/m2 and St2:128 ind/m2) and seagrass cover (57%– 61%).

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Journal articles on the topic 'Photoscan'

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