<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div style="font-family:Arial;">Hi,<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">For the first three you can look into gdaldem (<a href="https://linux.die.net/man/1/gdaldem">https://linux.die.net/man/1/gdaldem</a>).<br></div><div style="font-family:Arial;"><br></div><div style="font-family:Arial;">Regards,<br></div><div style="font-family:Arial;">Laurentiu<br></div><div style="font-family:Arial;"><br></div><div>On Tue, Feb 21, 2023, at 18:38, Roa Carvajal, Camila via gdal-dev wrote:<br></div><blockquote type="cite" id="qt" style=""><div dir="ltr"><div>Hi, <br></div><div><br></div><div>Recently I used gdaldem to compute slope and aspect from a Digital Elevation Model. In the past I've used SAGA GIS to compute a more extensive list of terrain parameters but it uses a large amount of memory for heavy raster files. So I'm looking for a program (or scripts) that does the computation with GDAL or an associated project. So far I found some of the computations are implemented in Grass Gis.<br></div><div><br></div><div>I would appreciate any information you can provide.<br></div><div><br></div><div>This is the list of terrain parameters that SAGA computes (<a href="https://saga-gis.sourceforge.io/saga_tool_doc/2.1.3/ta_compound_0.html" target="_blank">https://saga-gis.sourceforge.io/saga_tool_doc/2.1.3/ta_compound_0.html</a>):<br></div><div><p style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0px;font-stretch:normal;font-size:13px;line-height:normal;font-family:"Helvetica Neue";"><br></p><ul><li style="margin-left:15px;">Analytical Hillshading<br></li><li style="margin-left:15px;">Slope<br></li><li style="margin-left:15px;">Aspect<br></li><li style="margin-left:15px;">Plan Curvature<br></li><li style="margin-left:15px;">Profile Curvature<br></li><li style="margin-left:15px;">Convergence Index<br></li><li style="margin-left:15px;">Closed Depressions<br></li><li style="margin-left:15px;">Catchment Area<br></li><li style="margin-left:15px;">Topographic Wetness Index<br></li><li style="margin-left:15px;">LS-Factor<br></li><li style="margin-left:15px;">Channel Network Base Level<br></li><li style="margin-left:15px;">Channel Network Distance<br></li><li style="margin-left:15px;">Valley Depth<br></li><li style="margin-left:15px;">Relative Slope Position<br></li></ul><div>Thanks,<br></div><div><br></div><div>Camila Roa<br></div><div>Graduate Research Assistant @ GCLab<br></div><div>University of Tennessee<br></div></div></div><div>_______________________________________________<br></div><div>gdal-dev mailing list<br></div><div><a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br></div><div><a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><br></div><div><br></div></blockquote><div style="font-family:Arial;"><br></div></body></html>