Performance assessment of gps receivers in land leveling. / Avaliação do desempenho de receptores GPS em levantamentos altimétricos, para fim de sistematização de terras.
AUTOR(ES)
Antonio Carlos Silveira Coelho
DATA DE PUBLICAÇÃO
2003
RESUMO
The constant evolution of the equipments and softwares in the surveing field has brought a lot of gain in productivity and quality to make maps that are the foundation for the engineering projects. The purpose of this work is the comparative analyses of the data obtained by 3 different equipments that are very used in the national market - the Total Station, the Geodetic GPS and the Navigation GPS- in order to be able to evaluate the possibility of the use of the tracking GPS equipments for the elaboration of the terrestrial hypsometry. The studied area is in the Luiz de Queiroz Campus, in the University of São Paulo, in the city of Piracicaba, São Paulo state, whose approximate coordinates are: 22 4240S of latitude, and 47 3730 W of longitude, these datum are from July 2002. According to the applied methodology and the obtained result, the main conclusions are: a) it was possible to evaluate the mistake by the described equipments, confirming the possibility of the use of Geodesic GPS and discarding the use of the Navigation GPS for land systematization; b) with the use of the differential GPS, the volume between the MDTs (Total Station x Geodesic GPS) analyzed in three different areas, the average is 067%, which can be considered acceptable, and not meaningful when from the execution of the land systematization services, what ratifies the use of the Geodesic GPS equipment, if used according to the applied methodology.
ASSUNTO(S)
altimetry global positioming system. projetos agropecuários sistema de posicionamento global. altimetria agronomical projects
