[GRASS-user] Searching for technical details on how v.rast.stats calculates means and other statistics

[Markus Metz]

On Sun, Feb 22, 2015 at 8:36 AM, RichardCooper <richtcooper at hotmail.com> wrote:
> I've resolved - I hadn't set g.region aligning to the raster prior to
> v.to.rast:

g.region -a res=0.22 does not align the region to the raster, but to
the resolution. This is an important difference reflected in the
results

Markus M

>
> This appears to work,with outputs from r.univar matching v.rast.stats:
>
> g.region -p -a raster=cahpa_i0apr_05216_nc_remapped_nc_1 at prcp05216ijk
> res=0.22
> g.region -p align=cahpa_i0apr_05216_nc_remapped_nc_1 at prcp05216ijk
> v.to.rast --overwrite input=BMR_bndry_epsg4326 at prcp05216ijk type=area
> output=BMR_bndry_epsg4326_rasterized use=cat
> r.univar -g -t map=cahpa_i0apr_05216_nc_remapped_nc_1 at prcp05216ijk
> zones=BMR_bndry_epsg4326_rasterized at prcp05216ijk
>
> v.rast.stats map=BMR_bndry_epsg4326 at prcp05216ijk
> raster=cahpa_i0apr_05216_nc_remapped_nc_1 at prcp05216ijk column_prefix=test
> method=number,minimum,maximum,range,average,sum
>
>
>
>
>
>
> --
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