Hydrological indexes calculation requires the existence of spatial data such as the drainage network, the hydrological basin and the contours. For the Greek territory this data can be extracted from the topographic maps of the Hellenic Military Geographical Service (HMGS) or from remote sensing data. In this study the suitability and the accuracy of spatial information derived from remote sensing data are controlled with reference to the respective information from the topographic maps of 1/50.000. DSM from ALOS, ASTER, SRTM and airphoto stereopairs has been used for the automatic extraction of the drainage network, the hydrological basin and the calculation of hydrological indexes such as drainage length and Horton's Laws. The Selinountas river basin in western Peloponnese was selected for the evaluation and the results are presented in this paper.
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