[GRASS-user] r.horizon problems with large DEM

[Joshua Campbell]

I have been trying to run r.horizon on a SRTM DEM for the continental US,
with no success. The operation runs for about 45 minutes then eventually
just stops with no warnings or errors

I'm running GRASS 6.4-rc5 64-bit in Ubuntu 9.10 on a virtual machine
(Virtual Box on Windows XP 64-bit).

The r.horizon function will consume as much RAM as apply to the machine, up
to 6144 MB, plus an additional 4GB of swap memory.

The DEM is in Geographic coordinates - WGS 84. I tried to run r.horizon in
only 1 direction with maximum distance of 5310 meters.

Is there a file size limitation? Or any suggestions for an optimal size?

Thanks,
Josh

Joshua Campbell
Kansas Applied Remote Sensing Program
University of Kansas
Lawrence, KS
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