On Wed, May 6, 2009 at 11:22 PM, mohwawang <mohwawang at yahoo.com> wrote: > > Hi all, > > Is there a website that provides free download for raster elevation model (DEM) that can be used by the gdal utility gdal_contour? Thanks. Check here for a collection: http://grass.osgeo.org/wiki/Geodata Markus