Analysis of multiple images for edge detection of Sobradinho Reservoir, in Bahia, Brazil

ABSTRACT

Edge mapping tests of Sobradinho reservoir, Bahia, Brazil, were carried out on this work with TM Landsat-5 and MDE-SRTM images and SRTM-SWBD and ASTER-GDEM-VNIR edges. Mosaic of image segmentation band 4 TM sensor aided as comparative reference edge of the Sobradinho reservoir in relation to other images, and it was observed that the closest was the SRTM-SWBD edge of the NASA/NGA. Altimetry profiles were developed between MDE-SRTM edges, and also radiometric profiles, on the targeted band B4. It was found: low penetration of MDE-SRTM imaging in recessed edges of the reservoir, and discrepancies between the SRTM-SWBD edge (SWB) and the segmentation of the band 4.

Keywords:
segmentation; TM LANDSAT-5; MDE-SRTM; SRTM-SWBD; ASTERGDEM-VNIR