COMPARAÇÃO ENTRE DADOS ALTIMÉTRICOS SHUTTLE RADAR TOPOGRAPHY MISSION , CARTAS TOPOGRÁFICAS E GPS: NUMA ÁREA COM RELEVO ESCARPADO

Abstract

Shuttle Radar Topography Mission (SRTM) flown with Space Shuttle Endeavour, which was launched on 11 February 2000 , aimed to obtain the Earth digital elevation data (DEM). These data were acquired using Interferometric Synthetic Aperture Radar (InSAR) in C (5.6cm – 5.3GHz) and X (3.1cm – 9.6GHz) bands. This paper presents a comparative analysis of elevation data from SRTM and Topographic map (1:50.000) with Differential - GPS field data. The study was conducted in Planalto das Araucárias area , an elevated site in northeastern of Rio Grande do Sul State , Brazil . The Research and Nature Conservation Pró-Mata Center was chosen as an experimental area. Statistical tests and graphs were applied to the quality analysis of DEMs. RMSs of DEMs derived from SRTM and Topographic maps were respectively 7.0m and 26.8m. The results show that SRTM DEM present high accuracy. Nevertheless, considering the size of their pixels (90x90m), it is recommend to use this kind of data to a 1:250.000 scale maps.

Keywords

• Digital Elevation Model
• SRTM
• Accurracy
• DGPS.