[GRASS-user] UTM concepts

Dylan Beaudette dylan.beaudette at gmail.com
Mon Oct 9 13:04:58 EDT 2006

On Monday 09 October 2006 02:42, Glynn Clements wrote:
> Matthew Perry wrote:
> > First, for raster data. Lets say you have a raster dataset where each
> > pixel represents a physical, measurable count; for example each pixel
> > contains the number of humans who live in the geographic space
> > represented by the pixel. If you reproject that data, the actual space
> > covered by a pixel changes! Any reprojection routine will simply
> > recalculate the value of each pixel based on the chosen resampling
> > algorithm. If you take a population raster and reproject it, there is
> > a very little chance that the sum of the overall raster cells will be
> > maintained... By reprojecting you have altered your dataset and
> > changed the overall population!
> On a (slightly) related note, would it be worth extending
> r.resamp.stats to allow method=sum?

I think that is a great idea Glynn. Preserving the ideals of *knowing about 
one's data* along with preserving the important qualities of that data should 
be emphasized. 


Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis

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