[GRASSLIST:10200] Re: Problems with r.proj - grass 6.01

[Glynn Clements]

morten at untamo.net wrote:

> > Then i started location (2) and wanted to re-project the orthofoto 
> > from location (1) with r.proj into the current location. I set the 
> > resolution to 1 in the location and in the input of r.proj and the 
> > option „Do not perform region cropping optimization“.
> 
> Unless you are working with global maps you should let r.proj do region 
> cropping for you. Otherwise, if input and output are not overlapping, 
> you will end up with an empty map. r.proj will normally warn you that 
> the input map is outside the currrent region, but not so if you disable 
> region cropping.

Disabling region cropping (the -n switch) is the safest option. The
only disadvantages are that it may be slower, and it won't warn you in
advance if you are going to end up with an empty map.

It will never result in data being lost.

-- 
Glynn Clements <glynn at gclements.plus.com>