[GRASSLIST:3844] Re: Raster shift between large & small area

[Hamish]

> Now for an area approximately 1degree by 2 degrees
...
> I have also exported the same dem & hill shading
> over a smaller area appox 0.2deg x 0.2deg with
> r.out.arc.
...
> The problem is the vector shape file of the stream
> segments lines up exactly with the smaller rasters
> (0.2deg) but the larger area dem is shifted.  
> 
> I have also exported out the entire country dem
> and it to is shifted relative to the small 0.2 deg
> square dem.
> 
> The shift appears to be 2-3 pixels (0.000834
> degrees pixel dimension)
> 
> Whats up?  I have exported the entire thing twice
> thinking that I made a mistake but this error is
> reproducible.


Make sure the region bounds are on multiples that split up cleanly, so
the map won't be resampled at an offset..?


Hamish