[GRASS-user] How can I find average/maximum raster values within a vector area?

[Dylan Beaudette]

Another approach is to use a tool called Starspan. It works with any GDAL/OGR 
datasource - including GRASS raster and vector files.

cheers,
Dylan

On Thursday 02 August 2007 02:21, George MacKerron wrote:
> Many thanks to you both.
>
> v.rast.stats looks perfect -- it's churning away as I write...
>
> G
>
> On 2 Aug 2007, at 09:52, Daniel McInerney wrote:
> > George,
> > you could also use v.rast.stats to compute
> > pollution statistics for the administrative
> > areas. See [1] for more details.
> >
> > Daniel.
> >
> > [1] http://grass.itc.it/gdp/html_grass63/v.rast.stats.html
> >
> > Moritz Lennert wrote:
> >> On 02/08/07 06:59, David Finlayson wrote:
> >>> Forgot to CC grass list
> >>>
> >>> On 8/1/07, David Finlayson <dfinlayson at usgs.gov> wrote:
> >>>> I think you want the command r.statistics. You will need to convert
> >>>> your administrative areas vector map into a raster map where
> >>>> each area
> >>>> has a unique ID. Then run r.statistics on the pollution map
> >>>> using the
> >>>> administrative areas raster as the cover. This tool builds a
> >>>> database
> >>>> table with the min,max avg, etc statistics of pollution for each
> >>>> area
> >>>> id.
> >>
> >> How difficult would it be to create a module 'v.statistics' which
> >> would skip the step of converting the cover to raster ?
> >>
> >> Moritz
> >>
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>
> --
> George MacKerron  /  020 7870 7509