Hi there, I am using gdaldem to get a slope raster from a DEM (source: ASTER), but it seems like I can't get a correct result. For comparison purposes I did the same steps using Arcgis 10.0. In particular, I followed two procedures:
Procedure 1 1. Mosaiced different DEM rasters together 2. Projected the mosaic coordinates to linear 3. Calculated slope (for gdal: gdaldem slope with no extra options) The result I get is ok, but there are some linear features that are clearly artificial. ArcGIS gave the same result. Procedure 2 1. Mosaiced different DEM rasters together 2. Calculated slope (for gdal: gdaldem slope -s 111120) 3. Projected the slope raster in linear coord. The result is perfect in ArcGIS, while gdaldem returns a rsater that looks all white with some black dots (in greyscale, using the same scale of the ArcGIS one). What am I doing wrong? I am new to the mailing list (and gdal), so I am not sure if it's ok to attach examples. If you need them, I'll be happy to post the rasters. George
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