Some friends and I had a similar problem once. We had to find hilltops because, according to brazilian environmental legislation, they are environmental preserves. (Top 1/3 of the mountain / hill has to be preserved)
The way it was done to solve this was to define watersheds on an __inverted__ DEM Basically, once we invert the DEM, the sinks will be your peak. The watershed area will be your mountain / hill "influence zone". The highest and lowest elevation inside each watershed, are the hill top and bottom elevation. The preserved area in each mountain was everything above the 2/3 limit (top - (top-bottom)/3). There were some other things we considered, like maximum slope but, the basic idea was to just invert the DEM and work with watersheds... Cheers Daniel PS - The entire procedure was done in another commercial GIS software but I'm sure it can easily be done in Grass On Wed, Nov 18, 2009 at 8:33 PM, Markus Neteler <[email protected]> wrote: > On Wed, Nov 18, 2009 at 10:22 PM, Michael Barton <[email protected]> > wrote: >> Beyond r.param.scale, is there a good method anyone knows of to find peaks >> or hilltops? I'm more interested in the tops of hills/high points than the >> single cell that is the highest. > > Perhaps r.prominence: > http://grass.osgeo.org/wiki/GRASS_AddOns#r.prominence > could be of interest? > > Markus > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
