How to rotate a map

[Michael Shapiro]

In <9308021604.AA11909 at forestry.auburn.edu> moupu at forestry.auburn.edu writes:

>Dear members,

>I tried to use m.rot90 to rotate a raster map and it tells that the raster
>map I wanted to totate does not existed. Why does this happen?

m.rot90 doesn't process GRASS raster maps. It is a tool that
rotates non-grass simple 2D matrix files. You can use it
to rotate a raster map (if you know what you are doing).
You would have to uncompress the raster map (r.compress), then use m.rot90
on the uncompressed file under the cell/ directory. Then you
would have to modify the cell header (with r.support or by hand
using an editor) to interchage the rows and cols.

-- 
Michael Shapiro               shapiro at zorro.cecer.army.mil
U.S. Army CERL                (217) 373-7277
P.O. Box 9005 
Champaign, Ill. 61826-9005