Hi,
I just added a new module to the wiki addons page: r.surf.volcano
It creates an artificial surface resembling a seamount or cone volcano.
The user can alter the size and shape of the mountain and optionally
roughen its surface.
http://grass.osgeo.org/wiki/GRASS_AddOns#r.surf.volcano
http://trac.osgeo.org/grass/browser/grass-addons/raster/r.surf.volcano
It's a shell script and requires GRASS 6.3.0 or newer.
I'm using it for testing hydrodynamic flow models and r.sun.
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GRASS> r.surf.volcano --help
Description:
Creates an artificial surface resembling a seamount or cone volcano.
Keywords:
raster
Usage:
r.surf.volcano [-r] output=name [peak=value] [friction=value]
[sigma=value] [--overwrite] [--verbose] [--quiet]
Flags:
-r Roughen the surface
--o Allow output files to overwrite existing files
--v Verbose module output
--q Quiet module output
Parameters:
output Name for output raster map
peak Height of cone
default: 1000
friction Friction of distance, (the 'n' in 1/d^n)
options: 1-25
default: 6
sigma Surface roughness factor
default: 1.0
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enjoy,
Hamish