Thanks for the pointer to the Baylor U. GRASS site. Years ago I was
active in the GRASS steering committee but got "reorganized" and had to
drop out. For the last few years we've been conducting our own
development based on GRASS 4.1, without much reference to the outside
world. One of the mods made by our staff has been a modification of the
raster categories to permit either the normal category table or a linear
scaling. This came about because we found that raster files representing
continuous surfaces (e.g. density values from 1.00 gm/cc to 5.00 gm/cc)
took far too long to access in a production environment. We now have a
program called "r.modcats" which works like this:
r.modcats elevation <<EOF
title:Elevation (10 meter resolution)
auto:$1 to $2 meters
c1:10.0 -9.0
c2:10.0
0:Sea Level
EOF
This would generate the following title and categories:
Elevation (10 meter resolution)
0) Sea Level
1) 1 to 10 meters
2) 11 to 20 meters
etc.
However, the category file does not contain the categories but rather,
just the rules for generating them.
If this is not already in GRASS we probably ought to find a way to
contribute it to the effort.
--
Donald R. Newcomb * newcomb@navo.hpc.mil
Naval Oceanographic Office * newcombd@navo.navy.mil
Stennis Space Center, MS 39522 * Voice: (228) 688-5998
FAX: (228) 688-5485 * DSN: 485-5998