Academic literature on the topic 'Geodetic instrument'
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Journal articles on the topic "Geodetic instrument"
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Hamza, Veton, Bojan Stopar, Tomaž Ambrožič, Goran Turk, and Oskar Sterle. "Testing Multi-Frequency Low-Cost GNSS Receivers for Geodetic Monitoring Purposes." Sensors 20, no. 16 (August 5, 2020): 4375. http://dx.doi.org/10.3390/s20164375.
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Global Navigation Satellite System (GNSS) technology is widely used for geodetic monitoring purposes. However, in cases where a higher risk of receiver damage is expected, geodetic GNSS receivers may be considered too expensive to be used. As an alternative, low-cost GNSS receivers that are cheap, light, and prove to be of adequate quality over short baselines, are considered. The main goal of this research is to evaluate the positional precision of a multi-frequency low-cost instrument, namely, ZED-F9P with u-blox ANN-MB-00 antenna, and to investigate its potential for displacement detection. We determined the positional precision within static survey, and the displacement detection within dynamic survey. In both cases, two baselines were set, with the same rover point equipped with a low-cost GNSS instrument. The base point of the first baseline was observed with a geodetic GNSS instrument, whereas the second baseline was observed with a low-cost GNSS instrument. The results from static survey for both baselines showed comparable results for horizontal components; the precision was on a level of 2 mm or better. For the height component, the results show a better performance of low-cost instruments. This may be a consequence of unknown antenna calibration parameters for low-cost GNSS antenna, while statistically significant coordinates of rover points were obtained from both baselines. The difference was again more significant in the height component. For the displacement detection, a device was used that imposes controlled movements with sub-millimeter accuracy. Results, obtained on a basis of 30-min sessions, show that low-cost GNSS instruments can detect displacements from 10 mm upwards with a high level of reliability. On the other hand, low-cost instruments performed slightly worse as far as accuracy is concerned.
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Lösler, Michael, Cornelia Eschelbach, and Stefan Riepl. "A modified approach for automated reference point determination of SLR and VLBI telescopes." tm - Technisches Messen 85, no. 10 (October 25, 2018): 616–26. http://dx.doi.org/10.1515/teme-2018-0053.
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AbstractThe International Terrestrial Reference Frame (ITRF) is derived by combining several space geodetic techniques. Basically, a meaningful combination of the geodesic space techniques is impossible without further geometrical information, i. e. local-ties. Local-tie vectors are defined between the geometrical reference points of space geodetic techniques at co-location stations. These local-ties are introduced during the inter-technique combination process, to overcome the weak physical connection between the space geodetic techniques. In particular, the determination of the reference point of radio telescopes or laser telescopes is a challenging task and requires indirect methods. Moreover, the Global Geodetic Observing System (GGOS) strives for an automated and continued reference point determination with sub-millimeter accuracy, because deviations in local-ties bias global results.This investigation presents a modified approach for automated reference point determination. The new approach extends the prior work of Lösler but evades the synchronization between the terrestrial instrument and the telescope. Thus, synchronization errors are omitted and the technical effort is reduced. A proof of concept was carried out at Geodetic Observatory Wettzell in 2018. Using a high-precision, mobile laser-tracker, the reference point of the Satellite Observing System Wettzell (SOS-W) was derived. An extended version of the in-house developed software package HEIMDALL was employed for a mostly automated data collection. To evaluate the estimated reference point, the derived results are compared with the results of two approved models.
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Dvořáček, Filip. "Precision Tests of Geodetic Centring Equipment." Geoinformatics FCE CTU 15, no. 2 (December 8, 2016): 5–14. http://dx.doi.org/10.14311/gi.15.2.1.
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The paper introduces testing procedures of several different geodetic centring devices performed mostly at the laboratory of the Research Institute of Geodesy, Topography and Cartography. Functional construction characteristics of a spherically mounted retroreflector Leica RRR 1.5’’, rotatable carriers Sokkia AP41 and Leica GZR3 and 12 different geodetic tribraches were examined. Further, a centring displacement instrument developed at the Czech Technical University in Prague, Faculty of Civil Engineering, Department of Special Geodesy, is evaluated in both laboratory and field conditions. For all tests, laser tracker Leica AT401 with a 5 μm standard uncertainty of absolute distance measurement, was employed.
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Ustinova, Nelli, Vello Kala, Tarvo Mill, and Artu Ellmann. "GEODETIC SURVEYING STUDIES FOR CIVIL ENGINEERING STUDENTS AT TALLINN UNIVERSITY OF TECHNOLOGY." Geodesy and Cartography 38, no. 2 (June 29, 2012): 86–91. http://dx.doi.org/10.3846/20296991.2012.692213.
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Studies in the Tallinn University of Technology are based on a modular system, where geodetic surveying comprises a self-contained study module in the curricula of all civil engineering specialities. Due to geodetic surveying being taught to all first year students of civil engineering, it serves as a touchstone to test a student's suitability for an engineering specialism. Future civil engineers are taught basic geodetic measurements and how to use optical theodolite, levelling instrument and laser level. The paper gives an overview of geodetic surveying lectures, laboratory classes and field survey camp. Teaching and assessment are based on learning outcomes. Students who have passed the exam are allowed to participate in the summer field survey camp, the aim of which is consolidating the knowledge acquired throughout the year and practising teamwork.
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Šiaudinytė, Lauryna, Mindaugas Rybokas, and Vytautas Giniotis. "ANALYSIS OF ANGLE MEASUREMENTS AND A NEW APPROACH TO VERTICAL ANGLE CALIBATION / VERTIKALIŲJŲ KAMPŲ KALIBRAVIMO ANALIZĖ IR NAUJI KALIBRAVIMOBŪDAI / AНAЛИЗ УГЛOВЫХ ИЗМЕРЕНИЙ И НОВЫE МEТOДЫ КАЛИБРИРOВАНИЯ." Geodesy and Cartography 37, no. 4 (January 11, 2012): 149–53. http://dx.doi.org/10.3846/13921541.2011.645333.
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Testing and calibrating geodetic instruments is an important metrological procedure for precise instrumentation used in industry and geodesy. Electronic geodetic measuring instruments consist, among other elements, of circular scales and angular encoders for angle determination in two perpendicular horizontal and vertical planes. The accuracy of the instrument mostly depends on the accuracy of angle standards used for angle calibration in the horizontal plane. Although many methods are developed for angle calibration, the majority of those are not available for calibrating angles in the vertical plane. The method described in the International Standards of vertical angle calibration validates field testing geodetic instruments by taking precise angle readings between the calibrated points placed at long distance and height. Difficulties in creating such calibration basis and inconveniencies in proceeding with this field at long distances may appear. Also, the traceability of length and angle measurements is not ensured. The new method of calibrating the angles in the vertical plane for geodetic instruments was developed. The article describes the principle of indoor testing and the calibration of the vertical angle measuring system. Santrauka Daugelyje optinių elektroninių matavimo prietaisų yra įmontuotos apskritiminės skalės, skirtos kampinei padėčiai dviejose statmenose plokštumose – horizontaliojoje bei vertikaliojoje nustatyti. Prietaiso tikslumas daugiausia priklauso nuo sių skalių tikslumo. Rastrinių skalių metrologija yra gana specifinė sritis, būtina tam tikra metodika ir kalibravimo įranga. Trumpai apžvelgus pateikiami kai kurie būdai ir priemonės, taikytini kampų metrologijai, ypač vertikaliam plokščiajam kampui kalibruoti. Резюме Многие оптико-электронные измерительные инструменты состоят из круговых шкал для определения углов в двух перпендикулярных плоскостях – горизонтальной и вертикальной. Точность инструмента в основном зависит от точности этих угломерных шкал. Метрология угловых растровыx шкал довольно специфична и требует специфических мeтодов и приспособлений для калибрирования. В статье приводится обзор и некоторые простые способы и приспособления, которые можно использовать в метрологии углов, в частности, в калибрировании вертикального плоского угла.
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Shcherbakov, Vladimir, Ivan Shcherbakov, and Vladimir Astrahancev. "DEVICE OF THE ROAD MASTER TO CONTROL GEOMETRY RAIL TRACK." Interexpo GEO-Siberia 1, no. 1 (2019): 71–76. http://dx.doi.org/10.33764/2618-981x-2019-1-1-71-76.
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This article presents the development of an automated tool and method for ensuring the con-trol of the geometry of a rail track, which includes the functions of the traditional track template of the MCC type, as well as new functions not previously used in the instruments of the road master. The functionality of the instrument for instrumental inspection of railways is given, which is one of the tasks of equalizing the capabilities of mobile high-performance diagnostic tools for rail gauge and the superstructure of the track with measuring instruments of a road craftsman who is responsi-ble for the condition of the track. The technical characteristics of the road master device (PDM) are also given, and the results of the preliminary tests performed are assessed, which make it possible to automate the geodetic work most frequently performed by road foremen.
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Beran, Tomas, Lee Danisch, Adam Chrzanowski, and Maciej Bazanowski. "Measurement of Deformations by MEMS Arrays, Verified at Sub-millimetre Level Using Robotic Total Stations." Geoinformatics FCE CTU 12 (June 3, 2014): 34–40. http://dx.doi.org/10.14311/gi.12.6.
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Measurement of sub-millimetre-level deformations of structures in the presence of ambient temperature changes can be challenging. This paper describes the measurement of a structure moving due to temperature changes, using two ShapeAccelArray (SAA) instruments, and verified by a geodetic monitoring system. SAA is a geotechnical instrument often used for monitoring of displacements in soil. SAA uses micro-electromechanical system (MEMS) sensors to measure tilt in the gravity field. The geodetic monitoring system, which uses ALERT software, senses the displacements of targets relative to control points, using a robotic total station (RTS). The test setup consists of a central four-metre free-standing steel tube with other steel tubes welded to most of its length. The central tube is anchored in a concrete foundation. This composite “pole” is equipped with two SAAs as well as three geodetic prisms mounted on the top, in the middle, and in the foundation. The geodetic system uses multiple control targets mounted in concrete foundations of nearby buildings, and at the base of the pole. Long-term observations using two SAAs indicate that the pole is subject to deformations due to cyclical ambient temperature variations causing the pole to move by a few millimetres each day. In a multiple-day experiment, it was possible to track this movement using SAA as well as the RTS system. This paper presents data comparing the measurements of the two instruments and provides a good example of the detection of two-dimensional movements of seemingly rigid objects due to temperature changes.
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Paar, Rinaldo, Miodrag Roić, Ante Marendić, and Stjepan Miletić. "Technological Development and Application of Photo and Video Theodolites." Applied Sciences 11, no. 9 (April 25, 2021): 3893. http://dx.doi.org/10.3390/app11093893.
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Theodolites are fundamental geodetic measuring instruments for all practical geodetic tasks, as well as for experimental geodetic scientific purposes. Their development has a long history. Photo and video theodolites represent the advanced development of classic theodolites. Development started in 19th century, but only in the last 15 years has commercial application been achieved in the geodetic profession. The latest development, called image-assisted total stations (IATS), is a theodolite which consists of a classic robotic total station (RTS) with integrated image sensors. It was introduced in the early 2000s. With the development of theodolites, their application became much wider; today, they can be used for structural and geo-monitoring, i.e., for the determination of static and dynamic displacements and deformations of civil engineering structures such as bridges, dams, wind turbines, and high buildings, as well as natural structures, such as mountain slopes. They can be implemented in geodetic monitoring systems, which are an integral part of engineering structural diagnosis, and they provide essential information about the current condition of the structure. This paper describes the technological development of photo and video theodolites divided into phases according to the main innovations in their development. The application of modern video theodolites (i.e., IATS) is presented through several experimental studies that were performed. The procedure of conducting measurements with this kind of instrument, as well as the analysis of acquired data and achieved results, is elaborated. Lastly, the authors conclude, according to the achieved results, that IATS can today be used for determination of quasi-static and dynamic displacements with small and high amplitudes.
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GORB, A., and I. TREVOHO. "Innovative digital technologies in geodesy and geoinformatics at first online INTERGEO 2020." Modern achievements of geodesic science and industry 41, no. I (April 1, 2021): 16–22. http://dx.doi.org/10.33841/1819-1339-1-41-16-22.
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The analysis of the main news of the INTERGEO 2020 exhibition in Berlin in the field of geodetic instrument engineering is carried out, the characteristics of new systems and professional comment are given
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Golubkova, O. K., and A. I. Spiridonov. "Anniversary of the first national standards for geodetic instruments." Geodesy and Cartography 946, no. 4 (May 20, 2019): 20–25. http://dx.doi.org/10.22389/0016-7126-2019-946-4-20-25.
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State standards on the types, basic parameters of levels and theodolites as well as technical requirements were developed in CNIIGAiK in 1962–1963. The authors indicate the experience of developing the first State standards for geodetic instrument making, the difficulties encountered in developers. In this article the main stages of preparation of State standards, including action algorithm from technical specifications to submissions for the approval of the public service are marked step-by-step. The types of levels and theodolites, and the basic technical characteristics for each type are described. During 55 years the positive impact in the areas of production and application of standardized levels and theodolites, inter alia, streamlining the issuance of standard sizes of devices, increased production and improved their quality and technical level was revealed.
Dissertations / Theses on the topic "Geodetic instrument"
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Bručas, Domantas. "Geodezinių kampų matavimo prietaisų kalibravimo įrangos kūrimas ir tyrimas." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_092018-51641.
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Disertacijoje nagrinėjamos geodezinių kampus matuojančių prietaisų patikros bei kalibravimo metodai bei priemonės. Pagrindinis tyrimo objektas yra geodezinių prietaisų tikslumo parametrų matavimo būdų ir priemonių analizė, kalibravimo įrenginio kūrimas, jo tikslumo charakteristikų tyrimas bei įrenginio tobulinimas. Šie objektai yra svarbūs vykdant geodezinių prietaisų kalibravimą, kas savo ruožtu yra labai svarbu užtikrinant reikiamą šių prietaisų matavimų tikslumą geodezijoje, statybose, mašinų gamyboje ir t. t.
Pagrindinis disertacijos tikslas – geodezinių kampų matavimo prietaisų kalibravimo galimybių analizė ir sukurto kalibravimo įrenginio tikslumo parametr�� tyrimas.
Darbe sprendžiami keli pagrindiniai uždaviniai: plokščiųjų kampų matavimo metodų bei įrenginių, tinkamų geodeziniams prietaisams kalibruoti, analizė; daugiaetalonio kampų kalibravimo stendo kūrimas Vilniaus Gedimino technikos universiteto Geodezijos institute bei jo tikslumo charakteristikų tyrimas; stendo tikslumo didinimo galimybių bei priemonių tyrimas, ir apskritiminių skalių kalibravimo būdų tobulinimas.
Disertaciją sudaro šeši skyriai, įvadas, išvados, literatūros sąrašas bei priedai.
Įvade nagrinėjamas problemos aktualumas, formuluojamas darbo tikslas bei uždaviniai, aprašomas mokslinis darbo naujumas, pristatomi autoriaus pranešimai ir publikacijos, disertacijos struktūra.
Pirmasis skyrius skirtas labiausiai paplitusių plokščiųjų kampų matavimo būdų bei priemonių tinkamų geodeziniams prietaisams... [toliau žr. visą tekstą]The main idea of current PhD thesis is an accuracy analysis of testing and calibration of geodetic instruments. The object of investigation is an analysis of means and methods for testing and calibration of geodetic instruments for plane angle measurement, development of such calibration equipment, its accuracy investigation and the research of its accuracy increasing possibilities. These objects are important for successful testing or calibration of geodetic instruments for angle measuring which is essential in ensuring the precision of measurements taken in surveying, construction, mechanical engineering, etc. There are several main goals of the presented work. First one is an analysis of the angle measuring methods and devices suitable for the testing and calibration of geodetic instruments, according to the results of the mentioned analysis the second task can be formulated – creation of a multi-reference plane angle testing and calibration equipment at Institute of Geodesy, Vilnius Gediminas Technical University and investigate the parameters of its accuracy. The third task is to investigate the accuracy increasing possibilities of the equipment, and implementation some of them into the practice. The thesis consists of four chapters, introduction, conclusions, list of references and appendixes. Introduction is dedicated for an introduction to the problem and its topicality. There are also formulated purposes and tasks of the work; the used methods and novelty of... [to full text]
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Souza, Iara Alves Martins de. "A calibração de instrumentos de medições topográficas e geodésicas: a busca pela acreditação laboratorial." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-14102010-161303/.
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É um dever dos profissionais que trabalham na área de mensuração discutir os temas que envolvem a manutenção/calibração de instrumentos geodésicos em ambiente laboratorial e o uso de padrões específicos voltados para as áreas de instrumentação e de Sistema de Gestão da Qualidade. Para isso, é importante mencionar as normas ISO 17123:2001, NBR ISO/IEC 17025:2005, ABNT NBR ISO 9001:2000 e os métodos compactos para laboratório voltados para testar estações totais e instrumentos EDM. Neste contexto, o principal objetivo desta pesquisa é discutir os temas relacionados à manutenção/calibração de instrumentos geodésicos em laboratório, mostrando a importância da implantação do Sistema de Gestão da Qualidade (SGQ). Também são discutidas as vantagens decorrentes desta implantação, bem como a organização estrutural e de pessoal para tal sistema, apresentando as normas específicas usadas para a realização de trabalhos em agrimensura. Para compreender melhor a temática da dissertação foram pesquisados alguns laboratórios internacionais que trabalham com a manutenção/calibração de instrumentos geodésicos, que são acreditados pela norma ISO 17025:2005, são certificados pelas normas ISO 9001:2000 e realizam os seus procedimentos de acordo com os requisitos da norma ISO 17123:2001. Dessa forma, as avaliações sobre a estrutura organizacional do laboratório, a estrutura de pessoal e o SGQ implantado, foram realizadas de forma mais segura. Os laboratórios pesquisados realizam suas atividades de acordo com os requisitos das normas ISO 9001:2000, ISO 17025:2005 e ISO 17123, garantindo qualidade aos trabalhos nos laboratórios. A calibração realizada de forma correta e regular contribui para a promoção da qualidade das atividades nos laboratórios.It is the duty of professionals working in the area of measurement discuss issues involving the maintenance/calibration of geodesic instruments in the laboratory and the use of specific standards directed to the areas of instrumentation and Quality Management System. Therefore, it is important to dimensional standards ISO 17123:2001, ISO/IEC 17025:2005, ISO 9001:2000 and compact laboratory methods aimed at testing EDM instruments and total stations. In this context, the main objective of this research is to discuss issues related to maintenance/calibration of geodetic instruments in the laboratory, showing the importance of implementing the Quality Management System (QMS). Also discussed are advantages of this deployment, as well as the structural organization and personnel for such a system, with specific standards used to perform work in surveying. To better understand the theme of the thesis were searched some international laboratories that work with the maintenance/calibration of geodetic instruments, which are accredited to ISO 17025:2005 are certified by ISO 9001:2000 and realize their procedures in accordance with the requirements of ISO 17123:2001. Thus, the ratings on the organizational structure of the laboratory, the personnel structure and quality management system in place, were held more securely. The laboratories surveyed perform their activities in accordance with the requirements of ISO 9001:2000 and ISO 17025:2005 and ISO 17123, ensuring quality to work in laboratories. The calibration performed correctly and regularly contributes to the promotion of quality activities in the laboratories.
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Bručas, Domantas. "Development and research of the test bench for the angle calibration of geodetic instruments." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_092300-91259.
Full textAbstract:
The main idea of current PhD thesis is an accuracy analysis of testing and calibration of geodetic instruments. The object of investigation is an analysis of means and methods for testing and calibration of geodetic instruments for plane angle measurement, development of such calibration equipment, its accuracy investigation and the research of its accuracy increasing possibilities. These objects are important for successful testing or calibration of geodetic instruments for angle measuring which is essential in ensuring the precision of measurements taken in surveying, construction, mechanical engineering, etc.
There are several main goals of the presented work. First one is an analysis of the angle measuring methods and devices suitable for the testing and calibration of geodetic instruments, according to the results of the mentioned analysis the second task can be formulated – creation of a multi-reference plane angle testing and calibration equipment at Institute of Geodesy, Vilnius Gediminas Technical University and investigate the parameters of its accuracy. The third task is to investigate the accuracy increasing possibilities of the equipment, and implementation some of them into the practice.
The thesis consists of four chapters, introduction, conclusions, list of references and appendixes.
Introduction is dedicated for an introduction to the problem and its topicality. There are also formulated purposes and tasks of the work; the used methods and novelty of... [to full text]Disertacijoje nagrinėjamos geodezinių kampus matuojančių prietaisų patikros bei kalibravimo metodai bei priemonės. Pagrindinis tyrimo objektas yra geodezinių prietaisų tikslumo parametrų matavimo būdų ir priemonių analizė, kalibravimo įrenginio kūrimas, jo tikslumo charakteristikų tyrimas bei įrenginio tobulinimas. Šie objektai yra svarbūs vykdant geodezinių prietaisų kalibravimą, kas savo ruožtu yra labai svarbu užtikrinant reikiamą šių prietaisų matavimų tikslumą geodezijoje, statybose, mašinų gamyboje ir t. t. Pagrindinis disertacijos tikslas – geodezinių kampų matavimo prietaisų kalibravimo galimybių analizė ir sukurto kalibravimo įrenginio tikslumo para¬metrų tyrimas. Darbe sprendžiami keli pagrindiniai uždaviniai: plokščiųjų kampų mata¬vimo metodų bei įrenginių, tinkamų geodeziniams prietaisams kalibruoti, analizė; daugiaetalonio kampų kalibravimo stendo kūrimas Vilniaus Gedimino technikos universiteto Geodezijos institute bei jo tikslumo charakteristikų tyri¬mas; stendo tikslumo didinimo galimybių bei priemonių tyrimas, ir apskri¬timinių skalių kalibravimo būdų tobulinimas. Disertaciją sudaro šeši skyriai, įvadas, išvados, literatūros sąrašas bei priedai. Įvade nagrinėjamas problemos aktualumas, formuluojamas darbo tikslas bei uždaviniai, aprašomas mokslinis darbo naujumas, pristatomi autoriaus pranešimai ir publikacijos, disertacijos struktūra. Pirmasis skyrius skirtas labiausiai paplitusių plokščiųjų kampų matavimo būdų bei priemonių tinkamų geodeziniams prietaisams... [toliau žr. visą tekstą]
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Ribeiro, Fernando Cesar Dias. "Proposta de metodologia para verificação da estabilidade dos pilares de redes para monitoramento geodésico de barragens - estudo de caso." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-10112009-102642/.
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Um dos principais problemas no monitoramento das estruturas de uma barragem por meio de instrumentação geodésica se refere à confirmação da estabilidade dos pontos da rede geodésica de referência. Os eventuais deslocamentos detectados nas estruturas podem ser resultados de análises e interpretações equivocadas, já que os pontos de referência podem ser considerados estáveis sem indicação dessa condição. Considerando o objetivo deste trabalho, de verificar a estabilidade dos pilares da rede geodésica da Usina Hidrelétrica de ITAIPU por meio da tecnologia GPS, foi proposta uma metodologia que compreendesse o planejamento e a coleta dos dados, realizada em quatro épocas (campanhas) distintas, seguidos do seu processamento e ajustamento. No processamento dos dados verificou-se a melhor estratégia usando a fase da portadora L1, devido às linhas de base curtas (até 5km). Já no ajustamento, constatou-se a importância da detecção de erros grosseiros nas observações das linhas de base e também do controle de qualidade. Os resultados da aplicação desta metodologia foram as coordenadas ajustadas dos pilares da rede com as suas respectivas precisões para cada época. Estas coordenadas e suas matrizes variância-covariância foram então comparadas entre combinação de campanhas com a aplicação do teste de congruência global, para a verificação final da significância estatística das diferenças encontradas. Os resultados demonstraram que as investigações da estabilidade dos pilares da rede geodésica em estudo, dependem diretamente da qualidade das observações e do ajustamento, bem como da configuração da rede geodésica.One of the main problems in dams structures monitoring by geodetic instruments is the confirmation of the stability of reference points in geodetic networks. The detection of displacements on the structures can bring results of wrong analysis just because the reference points assumed as stable points may be not. Considering the objective of this work which is to verify the stability of the pillars in ITAIPU Power Plant geodetic network by GPS, a methodology was proposed including the planning and field surveys of four campaigns in different epochs, followed by data processing and baseline adjustment. According to the results of data processing it was verified that the better strategy is process the carrier phase L1 because the baselines are short (up to 5km). Regarding the adjustment, it was confirmed the significance of observations blunders detection and quality control. The results of methodology application were the adjusted coordinates of each geodetic network pillar and the respective accuracy for each campaign. Those coordinates with its variance-covariance matrices were compared between the campaigns by means of global congruency test verifying if statistically significant differences would be found. The results demonstrated that the pillars stability of studied geodetic network is directly dependent of the observations and adjustment quality, and also of the geodetic network layout.
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Milan, Vrtunski. "Model geosenzorske mreže za monitoring terena i objekata u realnom vremenu." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107637&source=NDLTD&language=en.
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Praćenje promena, odnosno, monitoring terena i objekata je zadatak odizuzetnog značaja, jer omogućava, u prvom redu, pravovremenoreagovanje i time smanjenje materijalne štete i ljudskih žrtava.Primena modernih tehnologija u oblasti senzora i komunikacijaobezbeđuje monitoring terena i objekata u realnom vremenu. Prostornodistribuirani senzori – geosenzorska mreža, prikupljaju podatke, kojise na računarima skladište i analiziraju. Disertacija se bavimodelom geosenzorske mreže, kao opštim rešenjem za monitoringterena i objekata, koje predstavlja polaznu osnovu od koje se može doćido sistema koji zadovoljava postavljene zahteve.Observing of changes, that is, monitoring of terrain and objects, is verysignificant task, since it enables timely response and thus decreasing ofmaterial damage and human casualties. Usage of modern sensor andcommunication technologies provides real-time monitoring of terrain andobjects. Spatialy distributed sensors, i.e. geosensor network, gather the datawhich are then stored and analyzed. In this disertation a model of geosensornetwork is proposed as a generalized solution for monitoring of terrain andobjects which can represent a basis in creating a system that can be alteredto meet the requirements in certain cases.
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Heizer, Alda Lucia. "Observar o ceu e medir a terra : instrumentos cientificos e a participação do Imperio do Brasil na Exposição de Paris de 1889." [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287043.
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Orientador : Maria Margaret LopesTese (doutorado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Resumo: A presente pesquisa tem por finalidade contribuir para a História das Grandes Exposições da segunda metade do século XIX, sublinhando a participação do Império do Brasil nesses grandes eventos, em particular na Exposição Universal de Paris de 1889. Consideramos possível, ao analisar os catálogos de instrumentos científicos, relatórios, memórias, revistas científicas, entre outras fontes, identificar pistas que nos revelam que o Império do Brasil pretendia desfazer a imagem de flor exótica nos trópicos. A partir da constatação de que os trabalhos acadêmicos realizados no Brasil sobre estes grandes eventos, dos anos de 1980 para cá, não se ocuparam da participação dos países da América Latina, este trabalho pretende se desenvolver na confluência de linhas de pesquisa que, embora plenamente articuláveis, permanecem, até hoje, em grande parte dissociadas na produção historiográfica nacional. Trata-se de pesquisas em História das Exposições Universais e a História dos Instrumentos Científicos
Abstract: This present research has the purpose to contribute for the history of the Great Expositions of the second half of the XIX century, underlining the participation of the Brazilian Empire on these events, in particular in the Paris Universal Exposition in 1889. We found it possible, when analyzing the scientific instrument¿s catalogues, reports, memories, scientific magazines, among other sources, to identify tracks that reveal to us that the Brazilian Empire intended to appear under the image of the ¿Exotic flower of the tropics¿. After discover that the academic works that were made in Brazil about these great events, from 1980 until today, disregard the participation of the Latin American countries, this work intend to be developed in the confluence of the lines of research , although they can be articulated, remains until today dissociated in the national history production. It¿s about research on the history of the Great Universal Expositions and the History of Scientific Instruments
Doutorado
Doutor em Ensino e História de Ciências da Terra
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Schwab, Silvia Helena Soares 1957. "Mares gravimetricas, influencias ambientais e calibração instrumental : estudos na estação Curitiba." reponame:Repositório Institucional da UFPR, 1999. http://hdl.handle.net/1884/43830.
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Orientador: Silvio Rogerio Correia de FreitasCo-orientador: Wladimir Shukowsky
Tese (doutorado) - Universidade Federal do Paraná
Resumo: A aquisição de dados de maré gravimétrica consiste em colocar o instrumento em aquisição de dados em uma estação, onde interferem algumas variáveis físicas tais como a resposta local a variação dos parâmetros de ambiente e o efeito indireto dos oceanos. Dentre as possíveis abordagens do problema, propõe-se a determinação das admitâncias e função de transferência entre as grandezas físicas envolvidas no processo. Para isto, e necessário que os dados resultantes da analise de maré sejam concordantes com os parâmetros de maré historicamente conhecidos para a estação. A sua adequação pode ser feita mediante uma calibração dinâmica do gravimetro, em relação aos valores de referencia. Este processo de calibração, assim como a determinação das admiâancias entre os parâmetros de ambiente e o efeito do carregamento oceânico em relação as maré gravimétricas, são fundamentais para a melhor aplicação dos gravimetros de mola, em vista da resolução exigida na atualidade na observação de mares. A metodologia de estudo aqui proposta, aplicada a dados obtidos pelo gravimetro GEO 783 na estação fundamental de Curitiba, Brasil (ICET-7305), pode também ser estendido para as operações normais de observação das mares gravimétricas em novas estações, possibilitando o refinamento das analises gravimétricas, desde que amostrados adequadamente os parâmetros do ambiente de aquisição. Cada influencia e considerada como um canal, de maneira a estudar as suas admitâncias com o canal gravimétrico, de forma independente. Desta forma, o estudo visa discriminar, em caráter local, a parcela de contribuição de cada um dos canais, através do seu modelamento, do estudo das suas correlações no domínio do tempo e principalmente através da construção das suas funções de transferência, em amplitude e fase, no domínio das frequências via analise espectral. Os experimentos realizados foram baseados em dados-minuto gravimétricos obtidos durante sete meses no ano de 1995, aliados a dados de pressão, temperatura e umidade do ar obtidos através de captores, com a mesma taxa de amostragem, devidamente calibrados com a utilização de instrumentos-padrão. Para a avaliação da adequação das correções instrumentais adotadas para o GEO 783, foi realizada uma comparação com os valores de referencia dos parâmetros de maré na estação, que indicou a necessidade de realizar a calibração dinâmica. Nesta, a partir do nível dos resíduos obtidos após a analise de maré, foram considerados como elemento discriminador para a avaliação da calibração, os valores de carregamento oceânico calculados para a estação, pela utilização do modelo de Schwiderski tradicionalmente adotado, e dos novos modelos introduzidos a partir de 1992, via altimetria por satélite TOPEX/POSEIDON. Com este procedimento, os valores resultantes da serie foram adequados para posterior estudos de influencias entre os canais. Com este fim, foram então estudadas as correlações entre os canais de pressão, temperatura e umidade com o sinal gravimétrico observado, nos dois domínios, do tempo e das frequências. Uma vez caracterizadas as admitâncias entre os canais, evidenciou-se uma forte correlação entre o sinal gravimétrico e a pressão atmosférica, que permitiu mediar valores para as funções de transferência entre estes canais, nas diversas bandas de frequências do espectro de mares.
Abstract: The acquisition of gravimetric tide data consists of placing the instrument on a station under the influence of some physical variables, such as the local response to environmental parameters and the indirect effects of oceans. Among the many possible methods to treat this kind of problem, it is proposed the determination of the admittances and transfer functions among the variables involved in the process. With that purpose, it is necessary that resulting analysed data be in accordance with the historically known tidal parameters of the station. Its adequacy can be verified through a dynamic calibration as function of reference values. This calibration process, as well as the determination of admittances between the environmental parameters and ocean loading related with gravimetric tides, are fundamental for a better use of spring gravity meters, taking into account the required resolution for Earth tides observation. The proposed methodology of study, was applied to data obtained by GE0783 at the Curitiba Fundamental Station (ICET-7305), Brazil. It can be extended to common gravimetric tide observations, performed in new stations. It also allows the improvement of the tidal analysis, because the environmental parameters can be adequately sampled. Each influence is considered as an independent channel, as a way to study their admittances with the gravimetric channel. Thus, the study aims to discriminate, with a local character, the contribution of each channel independently, through its modeling, its correlation in time domain, and mainly, the construction of its transfer functions in both frequency, in magnitude and phase, in frequency domain through spectral analysis. Experiments were carried out using gravimetric minute-sampled data, obtained at Curitiba Station during seven months, in 1995, together with air pressure, temperature and air humidity data, sampled at the same rate, and adequately calibrated to usual units of physics through the use of standard instruments. To estimate the adopted instrumental corrections for GEO 783, the results of tidal anlysis were compared with the reference values of tidal parameters at the station, which indicated the necessity to perform the dynamic calibration. In this last procedure, the discrimination element of the results of the calibration, was considered as being the calculated values for local ocean loading, by means the traditional Schwidersky method, and the news models established by satellite althimetriy, via TOPEX-POSEIDON. Then, the 1995' series was adequated to the influences analysis proposed in this work. The correlation coefficients between the air pressure, temperature and air humidity channels and the observed channel, in two domains, time and frequency were studied. The admittance between the channels was characterized, a significant correlation between the observed signal and air pressure was evident, allowing to focus on their transfer functions in the different frequency bands of the earth tide spectrum.
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Amarante, Rogério Rodrigues 1972. "Sistematização do processamento de dados gravimétricos aplicados a determinação do modelo geoidal." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258364.
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Orientador: Jorge Luiz Alves TrabancoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo
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Resumo: Com o uso de métodos adequados, receptores GNSS podem determinar coordenadas com acurácia suficiente para aplicação em projetos de engenharia. Porém a altitude elipsoidal obtida não utiliza o mesmo sistema de referência da engenharia de transportes. A altitude elipsoidal pode ser transformada em ortométrica com a utilização de modelos geoidais que são gerados a partir de dados gravimétricos. Neste trabalho são apresentados alguns conceitos introdutórios sobre a geração de modelo geoidais. Em seguida mostra o desenvolvimento de uma nova sistematização do tratamento de dados gravimétricos com objetivo de facilitar a detecção de erros, aumentar a produtividade e melhorar a organização de resultados obtidos. Dentro deste desenvolvimento, são revisadas as teorias utilizadas para transformar medições feitas com gravímetros diferenciais em aceleração da gravidade. Apresenta também técnicas de ajustamento de observações com intuito tratar erros aleatórios. A nova abordagem sugerida foi utilizada para o desenvolvimento de um software objetivando validar as idéias propostas, permitir a comparação com outras soluções existentes e também servir como uma contribuição tecnológica. Dados gravimétricos reais foram testados dentro da abordagem proposta tendo sido observados mais organização, ganho de produtividade e principalmente a detecção de erros grosseiros e aleatórios. Com a revisão do cálculo da correção da maré, percebeu-se que programas e equipamentos atualmente em uso não possuem configuração do fator gravimétrico, fato que pode influenciar em até 0; 007mGals no processamento das observações
Abstract: With the use of appropriate methods, GNSS receivers can determine coordinates with sufficient accuracy for use in projects. The ellipsoidal height obtained, however, does not use the same reference system as the one used in transportation engineering. The ellipsoidal height can be transformed to orthometric height using geoid models that are generated from gravimetric data. In this work some introductory concepts on the generation of geoid model are presented. Then it shows the development of a new approach in systematization of gravimetric data processing aiming to facilitate the detection of errors, increase productivity and improve the organization of the results obtained in the gravimetric surveys. Within this development, the theories used to convert measurements of the differences in gravity acceleration are revised. It also features adjustment techniques of observations in order to deal with random errors. The new suggested approach was used to develop software in order to validate the proposed ideas, allow comparison with other existing solutions, and also serves as a technological contribution. Gravimetric data were tested within the suggested approach. It was observed better organization, productivity gains and mainly detection of gross errors and random. With the review of the tide correction calculation, it was realized that programs and equipments now widely used have no gravimetric factor setting, a fact that can influence up to 0; 007mGals in processing the readings
Doutorado
Transportes
Doutor em Engenharia Civil
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Modro, Nelcimar Ribeiro. "Analise do desempenho instrumental da estação de mares terrestres da UFPR." reponame:Repositório Institucional da UFPR, 1997. http://hdl.handle.net/1884/43832.
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Orientador : Oziel Henrinque da Silva Leite, Silvio Rogerio Correia de FreitasDissertação (mestrado) - Universidade Federal do Paraná
Resumo: Atualmente o estudo das marés terrestres tem assumido grande importância no campo da Geodésia e Geofísica, uma vez que implicam em fenômenos Geodinâmicos. Este fenômeno é de natureza periódica, com variações desde poucos minutos a vários anos. As deformações induzidas na Terra, em resposta ao efeito citado, dependem das características regionais da crosta. É cada vez maior a necessidade de sua mensuração para a descrição das deformações regionais, pois as precisões atingidas pelos métodos geodésicos (e.g. VLBI, GPS, SLR e LLR) atingiram o limiar das variações da resposta da Terra às marés. Desde 1983, o Curso de Pós-Graduação em Ciências Geodésicas da Universidade Federal do Paraná, vem realizando pesquisas nesta área. A presente dissertação visa efetuar a análise comparativa dos dados da Estação de Marés Terrestres da UFPR colhidos por dois sistemas de aquisição (analógico e digital automatizado), visando quantificar o ganho de qualidade com o processo automatizado. Como elementos básicos de análise foram utilizadas as respostas teóricas para a Estação de Curitiba, determinações de longas séries temporais nesta mesma estação e como elemento decisivo para a determinação do nível de precisão, foi suprimido os efeitos indiretos dos oceanos para as principais ondas de maré gravimétrica, calculado para esta estação. Neste trabalho, verificou-se que não houve ganho com o processo automatizado estudado, face a inúmeras situações adversas que ocorreram com os dados disponíveis. Entretanto, este processo não pode ser caraterizado como inadequado.
Abstract: Studies on Earth tides has assumed great importance in Geodesy and Geophysics, because which varies it allows the investigation of Geodynamics phenomena. Earth tides have a periodic nature ranging fromfew minutes to some years. The induced crustal deformations of the Earth, as an answer to the tidal effect, depends on the regional characteristics of the crust. The monitoring of Earth tides grows up importance due to the increasing precision of the geodetic methods (e.g. VLBI, GPS, SLR and LLR), at the thereshold of the Earth response to the tides. Since 1983, the Graduation Programme in Geodetic Sciences of the Federal University of Paraná (UFPR) has being researching this area. This Dissertation describes an analysis of both, the anologue and digital data, collected at Curitiba Earth tides station, in order to verify the gain when using an automatic process. The basic elements used in this analysis were the predicted theoretical response of the Earth, data obtained after long time serie acquisition, and it as decisive element in the analysis, the indirect effect of the oceans on the measurements was subtracted for the main waves of gravity tides, all refering to the Curitiba Earth tides station. We concluded that there was no gain using the automatic process due to several reasons. Nevertheless, it cannot be regarded as inadequate.
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Suárez, Heymar Arancibia. "Uso do método compacto para calibração de estações totais." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-23102014-085221/.
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O uso correto de todo instrumento topográfico e geodésico tem como objetivo principal garantir a qualidade das medições. Para este fim é necessário realizar uma série de procedimentos periódicos de verificação da qualidade denominados de calibração. Diante do exposto, neste trabalho são apresentados os principais conceitos relacionados à qualidade nas medições e ao processo de calibração, tendo como objetivo principal, re alizar uma análise e a descrição do uso do Método Compacto, como uma alternativa para calibração de estações totais em ambiente laboratorial. Durante a pesquisa, foi estabelecido um conjunto de padrões de calibração, aplicáveis a estações totais. Para garantir a aplicabilidade do método foi realizado um trabalho em conjunto com o laboratório de calibração de instrumentos topográficos da empresa Química Suiza, localizado na cidade de Lima, Peru, para relatar as dificuldades da instalação do Método Compacto naquela empresa, os recursos necessários e as vantagens do uso do método. Apresenta-se, também um exemplo prático do uso do Método Compacto, em que foram avaliados os resultados obtidos no laboratório, com os dados mostrados em uma planilha eletrônica desenvolvida com base na norma ISO 17123:2001. Mediante este processo de comparação foi estabelecida a viabilidade da utilização do Método Compacto em um laboratório de calibração de estações totais.The correct use of all topographic and geodetic instrument aims to ensure the quality of the measurements. For this purpose it is necessary to perform a series of periodic quality checking procedures called procedures of calibration. According to it, this work presents the main concepts related to quality measurements and calibration process, having as main goal, to analyze and make a description of the use of the Compact Method, as an alternative to calibration of total stations in a laboratory environment. During the research, a set of calibration standards, applicable to total stations were established. To ensure the applicability of the method, the work was done among the laboratory of calibration of surveying instruments Química Suiza company, located in Lima, Peru, to report difficulties installing the Compact Method in that company, the res ources needs and advantages of using the method. Also, a practical example of using the Compact Method is being presented, in which the results obtained in the laboratory were evaluated with the data displayed in a spreadsheet developed based on ISO 17123:2001 standard. Through this comparative process, it was established the feasibility of using the Compact Method in a laboratory calibration of total stations.
Books on the topic "Geodetic instrument"
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Kravchenko, Yuriy. Surveying. ru: INFRA-M Academic Publishing LLC., 2017. http://dx.doi.org/10.12737/textbook_5900a29b032774.83960082.
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The contents of the book corre-sponds to the curriculum of surveying for building schools. Including historical and general information about on geodesy, the basic principles of treatment results of geodetic measurements, information about topographic maps and plans and solutions the problems with their use, description of instruments and methods of measurement of angles, distances and excesses on the earth surface, information about horizontal and vertical geo-detic networks, methods for creat-ing and processing survey geodes-ic networks, types and methods of survey, a description of the meth-ods removal projects in nature, description of the geodetic works in prospecting, designing and con-struction of objects capital con-struction.
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Sluiter, P. G. Geodetic dual-frequency GPS receivers under anti-spoofing: Comparison of four receivers for baseline accuracy susceptibility to radio frequency interference noise in the observables. Delft, the Netherlands: Netherlands Geodetic Commission, 1995.
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Deruelle, Nathalie, and Jean-Philippe Uzan. The two-body problem: an effective-one-body approach. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198786399.003.0056.
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This chapter presents the basics of the ‘effective-one-body’ approach to the two-body problem in general relativity. It also shows that the 2PN equations of motion can be mapped. This can be done by means of an appropriate canonical transformation, to a geodesic motion in a static, spherically symmetric spacetime, thus considerably simplifying the dynamics. Then, including the 2.5PN radiation reaction force in the (resummed) equations of motion, this chapter provides the waveform during the inspiral, merger, and ringdown phases of the coalescence of two non-spinning black holes into a final Kerr black hole. The chapter also comments on the current developments of this approach, which is instrumental in building the libraries of waveform templates that are needed to analyze the data collected by the current gravitational wave detectors.
Book chapters on the topic "Geodetic instrument"
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Chao, B. Fong, and Joseph C. Chan. "Atmospheric Gravitational Influence on Geodetic Satellite Orbits: Starlette Analysis." In From Mars to Greenland: Charting Gravity With Space and Airborne Instruments, 73–81. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4613-9255-2_7.
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Berrino, Giovanna, and Umberto Riccardi. "Far-field Gravity and Tilt Signals by Large Earthquakes: Real or Instrumental Effects?" In Geodetic and Geophysical Effects Associated with Seismic and Volcanic Hazards, 1379–97. Basel: Birkhäuser Basel, 2004. http://dx.doi.org/10.1007/978-3-0348-7897-5_6.
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Schlögl, Michaela. "Geodetic Engineering Instruments in the Transition from Mechanical Systems to Electronics and Satellite Technology." In Die Fakultät für Mathematik und Geoinformation, 133–49. Wien: Böhlau Verlag, 2015. http://dx.doi.org/10.7767/9783205202288-047.
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"The application of geodetic methods for displacement control in the self-balanced pile capacity testing instrument." In Advances and Trends in Engineering Sciences and Technologies, 31–36. CRC Press, 2015. http://dx.doi.org/10.1201/b19249-7.
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Smith, Victoria Anne, Graham Appleby, Marek Ziebart, and Jose Rodriguez. "Twelve Years of High Frequency Absolute Gravity Measurements at the UK’s Space Geodesy Facility: Systematic Signals and Comparison with SLR Heights." In International Association of Geodesy Symposia. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/1345_2021_129.
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AbstractAbsolute gravity measurements taken on a near-weekly basis at a single location is a rarity. Twelve years of data at the UK’s Space Geodesy Facility (SGF) provides evidence to show that the application of results from international comparisons of absolute gravimeters should be applied to data and are critical to the interpretation of theSGF gravity time series of data from 2007 to 2019. Though residual biases in the data are seen. The SGF time series comprises near weekly data, with exceptions for manufacturer services and participation in international instrument comparisons. Each data set comprises hourly data taken over 1 day, with between 100 and 200 drops per hour. Environmental modelling indicates that the annual groundwater variation at SGFof some 2 m influences the gravity data by 3.1 μGal, based upon some measured and estimated soil parameters. The soil parameters were also used in the calculation of the effect of an additional telescope dome, built above the gravity laboratory, and have been shown to be realistic. Sited in close proximity to the long-established satellite laser ranging (SLR) system and the global navigation satellite systems (GNSS) the absolute gravimetry (AG) measurements provide a complimentary geodetic technique, which is non space-based. The SLR-derived height time series provides an independent measurement of vertical motion at the site which may be used to assess the AG results, which are impacted by ground motion as well as mass changes above and below the instruments.
Conference papers on the topic "Geodetic instrument"
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Gelin, Chrystel R., and Nikolaos I. Xiros. "A Low-Cost, High Rate Motion Software Sensor System Based on Novel Data Fusion for Unmanned Surface Vehicle Navigation and Oceanographic Instrumentation Motion Correction." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49529.
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One of the major challenges in the navigation of underwater vehicles is obtaining precise and reliable positioning updates. Dead-Reckoning aided with Doppler velocity measurement has been, and remains, the most common method for underwater navigation for small vehicles. DR uses a set of navigation instruments to estimate the position of the vehicle by integrating the body-fixed velocity, accelerations, and angular rates with respect to time. Instrument error and bias lead to position error that increases exponentially with time. Thus, current DR systems require frequent position recalibrations. The Global Positioning System (GPS) provides measurements of geodetic coordinates for air and surface vehicles and it is often used to correct positioning error. However, underwater vehicles cannot use GPS for inflight navigation because GPS signals only penetrate a few centimeters past the air-sea interface. Thus, underwater vehicle navigation systems are limited to periodic position update from the GPS when they surface and extend an antenna through the air-sea interface. Standard GPS receivers are unable to provide the rate or precision required when used on a small vessel such as an Unmanned Surface Vehicle (USV). To overcome this, a low cost high rate motion measurement system for an USV with underwater and oceanographic purposes is proposed. The proposed onboard system for the USV consists of an Inertial Measurement Unit (IMU) with accelerometers and rate gyros, a GPS receiver, a flux-gate compass, a roll and tilt sensor and an ADCP. Interfacing all the sensors proved rather challenging because of their different characteristics. Some of the instruments have digital output (Compass/ADCP/GPS) while others have an analog output (IMU/tilt sensor). The proposed data fusion technique integrates the IMU, GPS receiver, flux-gate compass as well as tilt sensor and develops an embeddable software package, using real time data fusion methods, for a USV to aid in navigation and control as well as controlling an onboard Acoustic Doppler Current Profiler (ADCP). While ADCPs non-intrusively measure water flow, they suffer from the inability to distinguish between motions in the water column and self-motion. Thus, the vessel motion contamination needs to be removed to analyze the data and the system developed in this text provides the motion measurements and processing to accomplish this task.
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Lomtadze, Aleksandre, and Rūta Puzienė. "TESTING ACCURACY OF HEIGHT USING A VARIETY OF GEODETIC DEVICES." In Conference for Junior Researchers „Science – Future of Lithuania“. VGTU Technika, 2018. http://dx.doi.org/10.3846/geo.2018.009.
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In this paper we compare these three methods for testing accuracy of height using a variety of geodetic devices. Each method and device used allows for some precision results. This article examines the extent to which the accuracy of measurements is obtained theoretically, by choosing different measurement methods and different devices, obtained in practice, after measurements, i.e. how many heights measured by different devices will differ from each other. The study of measurements results from the chosen geodetic mark using different geodetic instruments was performed. The following devices are available for testing: GPNS Trimble 5800, Trimble M3 electronic timer, Leica Scan Station C10 laser scanner.
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Urbanas, Saulius, Eimuntas Kazimieras Parseliunas, Povilas Viskontas, Ruta Puziene, Arunas Buga, Asta Anikeniene, Silvija Gecyte, and Edita Jakubauskiene. "Struve Geodetic Arc – the Decade in the World Heritage List." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.248.
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Unique scientific project unifying scientitsts of present modern countries: Norway, Sweden, Finland, Estonia, Latvia, Lithuania, Belarus, Ukraine, Moldova, Russia was carried out in the first half of the 19th century. Results obtained for the mentioned period were very accurate especialy considering the size of the project and instruments used for the measurements. Network of triangulation of 2820 km lenght running from Danube mouth till Arctic Ocean also called Struve Geodetic Arc was built and measured in 1816–1852. That was the longest and most accurate measured meridian arc in 19th century which measurements data were used during the century for computing and improving parameters of the Earth elipsoid. Geodetic points of Struve Geodetic Arc were listed to the World Heritage List in 2005. Three points located in Meškonys, Paliepiukai and Gireišiai were commemorated in Lithuania. The Coordinating Committee of Struve Geodetic Arc was created for colaboration, spreading information for wider public, exchange of the best practice for preservation of Struve Geodetic Arc points. Practice, experience and problems related to the World Heritage List objects preservation are presented and analyzed in this publication.
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Ekimovskaya, V. A. "METHODS OF GEODETIC MONITORING OF ESTABLISHED BUILDINGS AND STRUCTURES." In Всероссийская научная конференция, посвященная памяти доктора технических наук, профессора Александра Дмитриевича Потапова. Федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский Московский государственный строительный университет" (НИУ МГСУ), 2021. http://dx.doi.org/10.22227/978-5-7264-2875-8.2021.60-64.
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The process of geodetic monitoring improves every year, this is mainly due to the development of science, new inventions appear that increase the accuracy of instruments many times compared to previous versions of measuring instruments. The article discusses the main as well as modern monitoring methods, considers the positive and negative aspects of the methods.
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Kwiecien, Janusz. "Testing of Geodetic Laser Instruments Under Conditions of Air Turbulence." In 2017 Baltic Geodetic Congress (BGC Geomatics). IEEE, 2017. http://dx.doi.org/10.1109/bgc.geomatics.2017.15.
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Barkovic, Duro. "AUTOMATION OF TESTING OF GEODETIC MEASURING INSTRUMENTS." In 14th SGEM GeoConference on INFORMATICS, GEOINFORMATICS AND REMOTE SENSING. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b22/s9.012.
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Gučević, Jelena, Siniša Delčev, and Vukan Ogrizović. "Inter-Laboratory Comparisons with the Calibration of Geodetic Instruments." In 16th International Congress of Metrology, edited by J. R. Filtz, B. Larquier, P. Claudel, and J. O. Favreau. Les Ulis, France: EDP Sciences, 2013. http://dx.doi.org/10.1051/metrology/201306009.
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Chubarenko, Boris, Boris Chubarenko, Konstantin Karmanov, and Konstantin Karmanov. "LONG-TERM DYNAMICS IN LOCATIONS OF COASTLINE OF THE VISTULA SPIT BY RESULTS OF THE SATELLITES IMAGES ANALYSIS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315e64cb0.
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Images of satellites OrbView-3 for 2004 and 2005 years (spatial resolution 1 m/pixel) and Pleiades for 2014 year (spatial resolution 0.5 m/pixel) for the Vistula Lagoon (the Baltic Sea) were used. In contrast to shoreline location often used as an indicator of a shore retreat the paper recommends to use the changes in location of dune edge as an indicator of shore dynamics. Nine well identified mark points were selected for the northern Russian part of the Vistula Spit as control ones. The average difference in locations of these points obtained by geodetic survey and satellite images was 0.4 m. The lines of the foredune edge for 25 km northern part of the Vistula Spit (from the Polish-Russian border to the Strait of Baltiysk) for 2004-2005 and 2015 were digitized with the step of 10 m and compared. Introducing the level of confidence ± 1.5 m per 10 years, we considered that eroded, stable and accreted parts of the shore have the total length 15.4, 4.9, 5.2 km (60.4%, 19.1%, 20.5%). The average (10 years) erosion rate for the marine shore on the Russian side of the Vistula Spit is 0.6 m/year, and accretion rate is 0.3 m/year. Maximum erosion rate (2.2 m/year) was revealed on the shore segment to south from the Strait of Baltiysk, which is under permanent erosion during last one century and a half after construction of the entrance jetties. The comparison of result of geodetic instrumental monitoring and estimation using satellite images showed that the second method slightly underestimates the shoreline displacement. Also it was shown that instrumental monitoring measurements at the profiles with spatial step of several kilometers are not optimal enough to reveal erosion/accretion processes for the shore of South-Eastern Baltic, which is characterized by alongshore nonmonotonic variations of shoreline dynamics parameters.
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Chubarenko, Boris, Boris Chubarenko, Konstantin Karmanov, and Konstantin Karmanov. "LONG-TERM DYNAMICS IN LOCATIONS OF COASTLINE OF THE VISTULA SPIT BY RESULTS OF THE SATELLITES IMAGES ANALYSIS." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9482291a80.12249659.
Full textAbstract:
Images of satellites OrbView-3 for 2004 and 2005 years (spatial resolution 1 m/pixel) and Pleiades for 2014 year (spatial resolution 0.5 m/pixel) for the Vistula Lagoon (the Baltic Sea) were used. In contrast to shoreline location often used as an indicator of a shore retreat the paper recommends to use the changes in location of dune edge as an indicator of shore dynamics. Nine well identified mark points were selected for the northern Russian part of the Vistula Spit as control ones. The average difference in locations of these points obtained by geodetic survey and satellite images was 0.4 m. The lines of the foredune edge for 25 km northern part of the Vistula Spit (from the Polish-Russian border to the Strait of Baltiysk) for 2004-2005 and 2015 were digitized with the step of 10 m and compared. Introducing the level of confidence ± 1.5 m per 10 years, we considered that eroded, stable and accreted parts of the shore have the total length 15.4, 4.9, 5.2 km (60.4%, 19.1%, 20.5%). The average (10 years) erosion rate for the marine shore on the Russian side of the Vistula Spit is 0.6 m/year, and accretion rate is 0.3 m/year. Maximum erosion rate (2.2 m/year) was revealed on the shore segment to south from the Strait of Baltiysk, which is under permanent erosion during last one century and a half after construction of the entrance jetties. The comparison of result of geodetic instrumental monitoring and estimation using satellite images showed that the second method slightly underestimates the shoreline displacement. Also it was shown that instrumental monitoring measurements at the profiles with spatial step of several kilometers are not optimal enough to reveal erosion/accretion processes for the shore of South-Eastern Baltic, which is characterized by alongshore nonmonotonic variations of shoreline dynamics parameters.
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Radulescu, Gheorghe M. T., and Adrian T. G. Radulescu. "The contribution of optical methods and geodetic instruments in structural monitoring: a brief historical survey." In SPIE Optical Engineering + Applications, edited by José Sasián and Richard N. Youngworth. SPIE, 2013. http://dx.doi.org/10.1117/12.2021702.
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