[GRASS5] [bug #4045] (grass) r.random not so random

Request Tracker grass-bugs at intevation.de
Fri Jan 27 12:45:16 EST 2006

this bug's URL: http://intevation.de/rt/webrt?serial_num=4045

Subject: r.random not so random

Platform: WindowsNT/2000/XP
grass obtained from: Other (CDROM etc)
grass binary for platform: Downloaded precompiled Binaries
GRASS Version: 6.0.0

I recently downloaded and installed the cygwin version of GRASS GIS.  My primary objective is to generate hillshades.  To do so I have been importing shapefiles with contour data and running v.surf.rst.  The results have been OK but very segmented. Following the suggestion by Neteler and Mitasova in "Open Source GIS: A GRASS Approach", I attempted to generate random points to merge with the contour points and re-run v.surf.rst.  Unfortunately, r.random seems to be generating points clustered at the top of the region. I have been unable to find a way around this in GRASS and have noticed only one or two mentions of the problem in the mailing list archives, but no suggested work-around.

Request: The randomness of r.random requires improvement/correction.


Paul A. Light

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