[GRASS-user] peaks from r.prominence

[Michael Barton]

Bulent,

I compiled r.prominence and can give you a copy. It seems to run best  
from the command line, with various problems in the GUI. I did a  
couple of tests and put the results of one into

http://www.public.asu.edu/~cmbarton/files/temp/

To run this, you first need to make a floating point DEM for some  
reason. You can do that with...

r.mapcalc 'DEM.fp = 1.0*DEM'

You need to pick the window size for identifying topographic  
prominence. I tried it with 5m and with 50m. The smaller window finds  
very small peaks and finds a lot of ridges. The larger window does a  
better job of finding peaks. But it tends to find major peaks (like  
inverted DEM and r.terraflow) rather than local ones.

The screenshots are for r.prominence run with a 50m window. Be  
forewarned it goes VERY slow with a large window and may take an hour  
or so.

Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity
Professor of Anthropology, School of Human Evolution & Social Change
Arizona State University

Phone: 480-965-6262
Fax: 480-965-7671
www: www.public.asu.edu/~cmbarton, http://csdc.asu.edu







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