Análise dos modelos digitais de elevação ASTER GDEM2 e SRTM com o modelo digital de terreno do projeto Radiografia da Amazônia

Abstract

The importance of Amazônia's economy to the country introduced requirements for are recognition of the entire forest territory. So far, to map all the area, the best solution found by brazilian army was based on use of the Synthetic Aperture Radar (SAR) Interferometry in X Band and Band P, generating Digital Terrain Models (DTM) and Surface Digital Models (MDS). Looking nowadays, many studies use digital elevation models to recognize areas, we selected a region within the State of Amazonas, in the municipality Fonte Boa to perform a comparison between altimetry three digital models. In this approach, the MDE's from the missions Advanced Spacebine Thernal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM2), Shuttle Radar Topography Mission (SRTM) and Digital Terrain Model - MDT Amazon Radiography Project were used , acquired on the Board Geographic Service, available from the geoportal of the brazilian army. The enlightenment of this analysis happens from these three types of sensors and which variables would carry the viability of these Elevation Digital Models ASTER GDEM 2 and SRTM in altimetry extraction from an area without reference level and plant formation of the amazon forest on a scale of 1: 50,000. It was established that the SRTM sensor didn't show great altimetry discrepancy in comparison with MDT Amazon Radiography, despite of the two digital models different bands and spatial resolution SRTM much lower, in this selected area. It can be used in a job that doesn't require accurate data, only the terrain modeling. The ASTER sensor GDEM2 wasn't adapted with large altimetric variations.