[GRASS-user] change resolution using g.region

Glynn Clements glynn at gclements.plus.com
Wed Aug 27 14:26:00 EDT 2008

Silvia Simoni wrote:

> does anyone know which is the algorithm applied to a raster map when  
> changing the resolution using g.region res=XXX?
> If I have a 1m resolution raster map and I change the region  
> resolution to 2m using g.region, the new 2x2-cell values are an  
> average of 4 cells in the 1x1-map?

Raster maps are sampled based upon the region; no interpolation or
aggregation is performed.

If you want interpolation or aggregation, you need to perform an
explict resampling step with r.resamp.interp, r.resamp.rst or

Glynn Clements <glynn at gclements.plus.com>

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