Ghandehari , Mehran 1 ; Buttenfield , Barbara P. 2 1 Department of Geography, University of Å·ÃÀ¿Ú±¬ÊÓƵ-Boulder, CO, USA 2 Department of Geography, University of Å·ÃÀ¿Ú±¬ÊÓƵ-Boulder, CO, USA Water is a very important natural resource, and it is mandatory that the surface water datasets used for topographic mapping, hydrological modeling,...