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This paper analyzes the potential of high-resolution images (QuickBird satellite) to mapping the relief features of a sector of the Planalto das Araucarias, an elevated area in northeastern Rio Grande do Sul, State, Brazil. The Center for Research and Nature Conservation PRO-MATA was chooses as an experimental area. In 1994, the PRO-MATA was created to perform studies and to propose actions for the conservation of the so-called Mata Atlântica. QuickBird data and GIS techniques were used to execute the mapping. Two field surveys were done to obtain ground-based information and to get control points through differential GPS. Main steps of the work: creation of a Digital Elevation Model (DEM), merging and geometric correction of the QuickBird image, mapping hydrology and geomorphology. Topographic features, such as slope, elevation and 3D views of the area were extracted from the DEM. Considering the morphologic and morphometric features of relief, the geomorphologic map was constructed at the 1/15,000 scale. The drainage network was mapped in detail. At the area under study, the strong relief and the steep slopes made it difficult to get ground control points and to correct geometric distortions of the image used. Nevertheless, the high spatial resolution of the image allowed a detailed mapping of the area, optimizing field surveys. The results show that the QuickBird image is fully adequate for study the relief of high-elevation area with rough terrain.

revista brasileira de geomorfologia

O POTENCIAL DE IMAGENS QUICKBIRD PARA ANÁLISE DO RELEVO DE UM SETOR DO PLANALTO DAS ARAUCÁRIAS, RS: CENTRO DE PESQUISAS E CONSERVAÇÃO DA NATUREZA PRÓ-MATA