Avaliação de modelos digitais de elevação para delimitação automática de bacias hidrográficas
Carregando...
Data
2009
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Elevation data, which are particularly useful for watershed delimitation, is becoming increasingly available. Specifically, in this study we evaluated the use of digital elevation models, derived from SRTM data (Shuttle Radar Topographic Mission) and aerial photo based contour lines obtained within the scope of the Brazilian Systematic Mapping (during the 70´s and 80´s), for the automated delimitation of watersheds for the entire State of Goiás and the Federal District (i.e. Brasilia region). According to the Cartographic Accuracy Standard (as defined by the National Cartography Technical Reference), the SRTR derived DEM falls within the class A category (at the 1:100,000 scale), while the other DEMs generated via interpolation (TopoGrid, IDW, TIN/GRID e TIN/GRID5) of the contour lines are class B. The quality of the SRTM data, while apparently invariant regarding the dominant land cover type, was highly correlated to the terrain slope. Comparatively to the manually delimited “Ottobacias”, the use of the SRTM DEM also yielded more precise delimitations. Nevertheless, these delimitations, quite similar to those based on the TopoGrid DEM, were locally affected by errors, mainly in flatter regions. Our results corroborate the use of geographic information systems for the automated delimitation of watersheds, particularly based on SRTM data, for both the favorable cost-benefit relation, as well as for the more objective criteria involved.
Descrição
Palavras-chave
Bacias hidrográficas, Watersheds, Modelo digital de elevação, Mapeamento sistemático nacional, SRTM, Digital elevation model, SRTM, Brazilian systematic mapping
Citação
MEDEIROS, Levindo Cardoso; FERREIRA, Nilson Clementino; FERREIRA, Laerte Guimarães. Avaliação de modelos digitais de elevação para delimitação automática de bacias hidrográficas. Revista Brasileira de Cartografia, Monte Carmelo, v. 61, n. 2, p. 137-151, 2009.