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

[George MacKerron]

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


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