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Analysis of Compilation Technology of Digital Terrain Model Based on Satellite, Tacheometric and Photogrametric Data

Pająk K.

Technical Sciences / University of Warmia and Mazury in Olsztyn

2009

nr 12

165-180

One of the most important, and at the same time, the most difficult task undertaken in complex process of generation geographic information system is generation of Digital Terrain Model. DTM is primary infromation layer used by systems which depict phenomena in qualitative way. It is also basic element in spatial structure of these systems. In literature there is a lot information concern obtaining terrain data to construct DTM by using photogrammetric and classical methods, but there is almost no information about using satellite methods in such purpose. In this article analysis of compilation technology of DTM generation based on data obtained due to various survey methods, including satellite one, are presented.

Jednym z najważniejszych, a zarazem najtrudniejszych zadań, jakie są podejmowane w złożonym procesie konstruowania systemów informacji przestrzennej, jest tworzenie numerycznego modelu terenu. NMT jest podstawową warstwą informacyjną wykorzystywaną przez systemy opisujące zjawiska wartościowo i stanowi dla nich podstawę organizacji przestrzennej. W literaturze przedmiotu znajdziemy wiele informacji dotyczących pozyskiwania danych terenowych do budowy NMT metodami fotogrametrycznymi i klasycznymi, mało jest natomiast informacji o wykorzystaniu do tego celu metod satelitarnych. W artykule przedstawiono analizę technologii powstania NMT z wykorzystaniem danych z różnych metod pomiarowych, w tym również metody satelitarnej.

The transmission of GNSS data in the distart network for real kinematic positioning

Barbarella M., Bedin A., Gandolfi S.

Reports on Geodesy

2006

z. 2/77

241-247

The GNSS RTK-Networks have been aroused a great interest for the advantages in the surveying of the territory in comparison to the traditional RTK methodology. The DISTART in the last year has improved a Network for RTK positioning. At present the net is composed by 8 permanent stations. The control centre is nearby the Department of DISTART of Bologna University. This network is fundamental to investigate all aspects concerning the networks for real time applications. Particularly, not only the topographic feature is investigated, but a very important aspect concerning the data transmission infrastructure is analyzed. In fact the first experimentations demonstrated that the performance of the topographic network depends on the guarantee of a correct data transmission from the GNSS permanent stations to the Control Centre. To investigate on this field we built a network composed by mixed physical data transmission infrastructure between control centre and the permanent stations on the territory (topographic baselines about 70-80 Km) using university Italian network (GARR) and commercial networks. We studied the time of latency of data transmitted, that is an important aspect of the network, because to solve ambiguities every software for real time network solution needs that the GNSS permanent station observations arrives with a latency not too much greater than a second. Parallely we studied other important aspects of the data transmission in the network like the NAPs (Network Access Protocols), the velocities, the data formats (RTCM 2.X, RTCM 3.0). In this work we want to give the direction to characterize a procedure step by step of a network installation, wit h the purpose to define a standard, possibly certified, about procedures, materials, softwares to use to install a network of GNSS permanent stations for RTK positioning.