It's very simple. It really just averages the values of raster cells for a neighbourhood window of a size m x n. It then determines how much the cell in the window center deviates from that average. Add some normalization and you get a map that shows you which cells "stick out" most. Use it on a map with elevation values and you can (tentatively) call that topographic prominence. The module lets you choose different window sizes and shapes and whether to use local (within window) or global (over whole map) normalization.
Ben ----- Original Message ----- From: "Bulent Arikan" <bulent.ari...@gmail.com> To: grass-user-requ...@lists.osgeo.org, grass-user@lists.osgeo.org Sent: Monday, November 23, 2009 7:46:52 PM GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna Subject: [GRASS-user] r.prominence Hi, I have been using r.param.scale and inverting DEM method for identifying peaks. I am specifically interested in finding the high spots on a landscape; not just the highest single cell. It has been suggested that r.prominence may be of help. I realise that this comes in a file that needs to be compiled (.c extension). Before compiling, I will appreciate any insight on what it does. Thank you -- BÜLENT ARIKAN School of Human Evolution and Social Change Arizona State University Tempe - AZ 85287-2402 _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ------ Files attached to this email may be in ISO 26300 format (OASIS Open Document Format). If you have difficulty opening them, please visit http://iso26300.info for more information. _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
