[GRASSLIST:7035] Re: region related issues with r.proj

Hamish hamish_nospam at yahoo.com
Mon Jun 6 19:34:19 EDT 2005

> I have just stumbled upon a bit of an issue while using r.proj in
> grass6.0.  The situation is as follows:  I have imported a 10m dem of
> a comparatively large scale (zoomed out area) of a 10m dem, and what I
> would like to do is import this dem into a location of a smaller
> region using r.proj (I have done this successfully in a different
> scenario), but it complains that "the input map is outside current
> region."  I figure that the problem is just as grass reports it,
> but I am not sure how to fix it/make it work.  The projection
> converion is from nad83 to nad27. (On a separate note, is this inverse
> chronical conversion an error--is it better to run map projects in the
> most recent projection systems?)

Hint for getting the region correct:

Use v.in.region to rectify a box showing where your data will end up,
and then rectify the raster to this fine tuned region.

in the source location:  (nad83)

v.in.region out=region_box

in the target location:  (nad27)

v.proj in=region_box
g.region vect=region_box
r.proj in=old_map

good luck,

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