[GRASS-user] Using a polygon as a Mask

[António Rocha]

Thank you Christian
What I am affraid is that when I convert Vector to RASTER I will obtain 
a mask that is not exacly the polygon in the boundaries of the polygon. 
For instance, if a pixel is "cuttted" by the polygons boundaries is it 
considered part odf the polygon or not?

Thanks
Antonio

Christian Schwartze wrote:
> There is no way to use a vector geometry in mapcalculator (or mapcalc) 
> directly, hence, you have to convert it to raster before.
>
> Christian.
>
> --------------------------------------------------
> From: "António Rocha" <antonio.rocha at deimos.com.pt>
> Sent: Thursday, May 27, 2010 2:08 PM
> To: "GRASS user list" <grass-user at lists.osgeo.org>
> Subject: [GRASS-user] Using a polygon as a Mask
>
>> Greetings
>>
>> I have polygon that I want to use to define an for which I want to 
>> calculate some indicators (almost as a mask). Is it possible to use 
>> it directly in mapcalculator or do I have to convert it to RASTER and 
>> only then I can use it in mapcalculator as a mask?
>>
>> Thanks
>>
>> Best regards,
>> Antonio
>>
>>
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>
>
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>
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