Browsing by Author "Doskocz, Adam"

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Access status: Open Access ,
Estimation of horizontal accuracy of the large-scale digital maps
(2011) Doskocz, Adam; Dąbrowski, Władysław
Today, government and self-government institutions as well as businesses deploy spatial information in the broadly defined concept of management. This is realized by theoretical and practical efforts supporting the development and updating of digital map databases and their effective and rational (preceded by an analysis of their quality) application for execution of economic tasks. The paper presents estimation of horizontal accuracy of digital maps produced by means various methods: new total station survey (object A), recalculation of previous direct measurements (orthogonal and polar surveys) (object B), manual vectorisation of a raster orthophotomap image (object C) and graphical-and-digital processing of analogue maps (object D). Carried out investigations shown that digital data produced by various methods do not always support the development of geodetic documentation at the required accuracy level. The authors postulate the need to estimate the accuracy of the databases of large-scale maps to ensure the transparency of relations between map producers and map users, and to guarantee that national geodetic and cartographic resources meet the relevant quality standards.
Access status: Open Access ,
Initial analysis of the accuracy of position determination using ASG-EUPOS NAVGEO (RTK VRS) service
(2010) Uradziński, Marcin; Doskocz, Adam
ASG-EUPOS system, as a part of Project EUPOS (European Position Determination System), is a new multifunctional system of precise satellite positioning in Poland. It makes GNSS corrections and raw observations collected at 116 reference stations accessible to the users, what provides precise real time positioning, post-processing and supports navigation in the whole area of Poland. This new system, which is based on reference stations network including EUREF-POL, POLREF and EUVN points, accomplishes ETRF89 reference system. One of the most accurate real time positioning services provided by ASG-EUPOS is NAVGEO service, which is RTK VRS network solution. It enables streaming of RTCM corrections for mobile users by using the latest mobile communication technologies such as GPRS or UMTS in any area covered by a cell-phone network. Noting great potential of RTK technique (enabling positioning to centimeter accuracy), authors decided to put NAVGEO service into test as a potential tool for map and geographical databases updating. Our approach of testing the performance of this service is based on field experiments and the analysis of both the accuracy and availability of RTK data using mobile wireless transmissions. We investigate the advantages and disadvantages of this service. Experiments were conducted on the test marks which were determined by static occupation (below centimeter level of accuracy) under different conditions (opened areas and covered by trees and buildings). All the tests were performed in the various periods of time using the latest Topcon HyperPro GPS/GLONASS receivers.