Journal of Geodesy, Cartography and Cadastre - No 3 / 2015
Integral issue here
Table of Contents (technical articles)
Differential SAR Interferometry for the Monitoring of the UNESCO World Heritage Sites / Iulia Dana Negula, Violeta Poenaru, p. 2-8
Extending the availability area of positioning services ROMPOS / Mihaela-Simina Puia, Vlad Sorta, Neculai Avramiuc, p. 9-14
Systematic registration of properties – a new challenge for Romanian cadastral system / Muşat Cosmin Constantin, Vîlceanu Clara Beatrice, Moscovici Anca Maria, p. 15-20
Deformation prediction and analysis by finite element method / Cătălin Ionuț Vintilă, Andreea Carmen Rădulescu, Petre Iuliu Dragomir, p. 21-27
Testing a new method of digital images acquisition in the process of 3D reconstruction of an object / Paun Corina Daniela, Valeria Ersilia Oniga, Ciobanu Laura Elena, p. 28-36
Investigation on the influence of the incidence angle on the reflectorless distance measurement of a terrestrial laser scanner / Miriam Zámečníková, Hans Neuner, Stefan Pegritz, Robert Sonnleitner, p. 37-44
Specifics of geodetic engineering measurements for staking out high voltage lines / Petre Dragomir, Alexandru Moldoveanu, Tudorel Silviu Clinci, Daniela Cristiana Docan, p. 45-51
Differential SAR Interferometry for the Monitoring of UNESCO World Heritage Sites
Iulia Dana Negula, Violeta Poenaru
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
Persistent Scatterer Interferometry and Small Baseline Subset Interferometry enable the detection, measurement and monitoring of ground displacements. These differential synthetic aperture radar interferometry techniques were applied to investigate the ground stability of the Historic Centre of Sighisoara, a cultural UNESCO World Heritage Site. In line with the objectives of the "Open Initiative on the Use of Space Technologies to Support the World Heritage Convention", the monitoring of Sighisoara World Heritage Site was performed based on Earth Observation data. A multi-temporal series of very high resolution TerraSAR-X data was analyzed and processed and the results provide the local authorities in-charge of the site protection and conservation a basis for informed corrective measures and strategies.
Keywords: Differential SAR interferometry, TerraSAR-X, Historic Centre of Sighisoara, World Heritage Site, Earth Observation
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Extending the availability area of positioning services ROMPOS
Mihaela-Simina Puia, Vlad Sorta, Neculai Avramiuc
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
In Romania there are installed 74 GNSS permanent stations, since 1999 and in 2012 the network was completed, touching the density recommended by European organizations. This fact allows providing high quality ROMPOS (Romanian Position Determination System) services inside the network. Providing reliable ROMPOS services in the frontier zone is possible due to cross – border GNSS raw data exchange from close border GNSS reference stations. Nowadays Romania, through National Agency for Cadaster and Land Registry has signed a few cross - border GNSS data agreements with homologous authorities from Hungary, Moldova and Ukraine and has good cooperation perspectives by similar authorities from Serbia and Bulgaria, with whom these kind of data exchanges were already tested. ROMPOS real time services are accessed through internet data services. Considering the fact that there are a few areas in Romania where these kind of data services have no coverage, to use the real time positioning services it is required to use alternative methods to retransmit the products afferent to these services.
Keywords: Permanent station, position determination service, RTK/DGNSS, user
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Systematic registration of properties – a new challenge for Romanian cadastral system
Muşat Cosmin Constantin, Vîlceanu Clara Beatrice, Moscovici Anca Maria
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
The dynamic international professional environment and the constant contacts among similar institutions have contributed in time to the creation of a common vision on relevant issues and identification of common targets, meant to diversify the products and satisfy ever more customers and make them loyal;. that is precisely why we consider not only important, but also interesting that one should learn as many things as possible about the activity performed by National Agency of Cadastre and Land Registration in the field of international relations, within a multicultural professional environment in which, due to common efforts, we have our part, very well defined.
For many decades, traditional cadastral systems have tended to enjoy a reputation for reliability, well defined processes, and a well-recognized guarantee of security of private land ownership. Tremendous technological progress, social change, globalization, and the increasing interconnection of business relations with their legal and environmental consequences, however, have put a strain on the traditional systems.
They cannot adapt to all the new developments. An obvious indication of this is the many reforms that cadastral systems are going through.
Keywords: Systematic cadastre, land registration, real estate, cadastral system, land ownership.
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Deformation prediction and analysis by finite element method
Cătălin Ionuț Vintilă, Andreea Carmen Rădulescu, Petre Iuliu Dragomir (coordinator)
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
This article presents the basic idea in the finite element method, which is to find a solution of a complicated problem by breakdown to several simpler problems. The main issue is that since the actual problem is replaced by a simpler one, it will be able to find an approximated solution rather than the exact one, the approximation is strong related to the type of the discretization and the number of finite elements use to solve the problem.
Although this method has been extensively used in other engineering fields like structural mechanics, fluid dynamics, heat conduction and electrical field it can be successfully applied to solve several problems in deformation analysis.
Keywords: Finite element method, Prediction, Deformation Analysis
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Testing a new method of digital images acquisition in the process of 3D reconstruction of an object
Paun Corina Daniela, Valeria Ersilia Oniga, Ciobanu Laura Elena
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
In more and more spheres of activity (industry, construction, aerospace, quarry, etc.) it is necessary to achieve three-dimensional models. Currently, using high-resolution digital images for the 3D reconstruction of an object can be a precise and an inexpensive alternative, used more frequently in the research studies. The data acquisition process is performed without any direct contact with the studied object, in a very short time and the results of processing the acquired digital images are reliable and accurate. In most of the software, for the best results, it is recommended to take the images so that the angles between the skew rays to be as close to right angles as possible, while moving around the object to be reconstructed in 3D. In order to test the functionality of this new method of images acquisition, there was created the 3D model of a stone, using the images acquired with the Canon EOS 60D digital camera. The stone’s 3D model was represented as a point cloud which was automatically generated using the Structure from Motion (SfM) algorithm. Then, the point cloud was scaled based on a reference model obtained by TLS measurements, i.e. a reference distance. Finally, the point cloud obtained by close-range photogrammetry was compared, using the Hausdorff distance, with the point cloud obtained by TLS technology. The standard deviation of the distances between these two point clouds is a measure of the accuracy of the point cloud obtained by using the proposed configuration of digital camera positions.
Keywords: digital image, image configuration, SfM, precision
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Investigation on the influence of the incidence angle on the reflectorless distance measurement of a terrestrial laser scanner
Miriam Zámečníková, Hans Neuner, Stefan Pegritz, Robert Sonnleitner
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
Although the influence of incidence angle (IA) is one of the known error influence of terrestrial laser scanners (TLS), it is not taken into account in the evaluation of TLS-data. In this paper fundamental question is discussed, how the IA influences the TLS-distances, it is of stochastic or of systematic nature or of a combination of both. For this purpose, a new methodology has been developed. Its special feature is that the directly measured TLS-distances are compared with reference distances. It is optional for close range and for longer distances. The methodology was realised with a time of flight laser scanner. At close range of 3.5 to 5.2 m other error effects up to 4.4 mm are more pronounced than the influence of IA. At the distance of about 30 m, a systematic effect of the IA was found. The total variation of the distance difference with IA is of ca. 2.0 mm. The stochastic properties of the influence of IA could not be quantified. In future works the methodology will be improved with respect to the obtained knowledge and the error influence well be completely quantified.
Keywords: incidence angle, reflectorless distance measurement, laser scanner
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Specifics of geodetic engineering measurements for staking out high voltage lines
Petre Iuliu Dragomir, Alexandru Moldoveanu, Tudorel Silviu Clinci, Daniela Cristiana Docan
Received: April 2015 / Accepted: September 2015 / Published: December 2015
Abstract
In this article are presented the implications of geodetic engineering measurements in the design, verification and execution of high voltage power lines. Depending on the location on the globe can arise specific situation that involving special solutions work. In these conditions requires integration of interdisciplinary knowledge related to the field of terrestrial measurements such as mathematical cartography, geodesy and surveying engineering measurements. In the case study is presented a special situation due to the existence in the area of two different coordinate systems.
Keywords: high voltage lines, staking out, coordinate systems
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