DESCRIPTION
r.rot90 rotates a raster array by 90 degrees clockwise.
NOTES
The entire map must be loaded into memory, which may be a problem
for large rasters. The coordinates of the northern and southern
bounds of the map will be flipped to satisfy the N > S requirement.
It is likely that the user will want to use the r.region
module to reset the bounds regardless.
REQUIREMENTS
GNU Octave.
TODO
Either rewrite as a C module (see the code from GRASS 5's m.rot90
module) or use NumPy/SciPy to do the work, as the Python libraries
may be more commonly installed than GNU Octave.
SEE ALSO
r.flip Addon module for GRASS 6
m.flip and m.rot90 modules for GRASS 5
r.in.mat
r.out.mat
r.region
AUTHOR
Hamish Bowman
Dunedin, New Zealand
Last changed: $Date$