Comparison between hydrographically conditioned digital elevation models in the morphometric charaterization of watersheds

Engenharia Agrícola

Hugo A. S. Guedes²  Demetrius D. Da Silva¹ 

[1] ,UFVViçosa MG

关键词: digital elevation models;    water resources;    remote sensing;    morphometry;    modelos digitais de elevação;    recursos hídricos;    sensoriamento remoto;    morfometria;   

DOI  :  10.1590/S0100-69162012000500012

来源: SciELO

【 摘 要 】

The aim of this study was to compare the hydrographically conditioned digital elevation models (HCDEMs) generated from data of VNIR (Visible Near Infrared) sensor of ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer), of SRTM (Shuttle Radar Topography Mission) and topographical maps from IBGE in a scale of 1:50,000, processed in the Geographical Information System (GIS), aiming the morphometric characterization of watersheds. It was taken as basis the Sub-basin of São Bartolomeu River, obtaining morphometric characteristics from HCDEMs. Root Mean Square Error (RMSE) and cross validation were the statistics indexes used to evaluate the quality of HCDEMs. The percentage differences in the morphometric parameters obtained from these three different data sets were less than 10%, except for the mean slope (21%). In general, it was observed a good agreement between HCDEMs generated from remote sensing data and IBGE maps. The result of HCDEM ASTER was slightly higher than that from HCDEM SRTM. The HCDEM ASTER was more accurate than the HCDEM SRTM in basins with high altitudes and rugged terrain, by presenting frequency altimetry nearest to HCDEM IBGE, considered standard in this study.

【 授权许可】

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