How to rotate a map

Greg Koerper greg at
Mon Aug 2 16:05:46 EDT 1993

> 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 does NOT operate on GRASS raster data.  Instead, it expects data in
the format written by the m.* tape and file extraction programs.  Also, the
full pathname must be used in specifying the name of an already existing 
file; the current mapset search list is not considered, nor is it applicable.

Hope this clarifies your situation.

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