[GRASS-user] Export specific shapes from a vector file

[leonidas]

Yes that was what exactly I need.Thanks again

Nikos Alexandris wrote:
> 
> On Mon, 2009-02-16 at 13:14 -0800, leonidas wrote:
>> Thank you Niko,
>> well I understand the first one (using v.extract).
>> -Is it possible to do something like that using v.out.ogr and export to
>> shapefile?
> 
> AFAIK, no. The way to do it is: v.extract + v.out.ogr
> 
> 
>> -As far as concerns the second question using v.to.rast, how can I export
>> only specific areas using sql where clause or list for specific
>> categories?
> 
> Apologies, I overlooked the word "specific" before. Here (again) I think
> you would need v.extract + v.to.rast. An example:
> 
> Let's say you have the CORINE map in whose attribute table you have a
> column named "level3" of type integer (with a lentgh of 3) which
> contains the CORINE land cover class codes (111,112,113, etc.).
> 
> And now you need to extract specific classes, that is areas with
> specific "level3" codes (i.e. 111, 112, 122, 123, 141, 142). Then you
> could do:
> 
> v.extract in=corine_ellas_v2 out=corine_ellas_v2_subset
> where='"level3"="111" or "level3"="112" or "level3"="112" or
> "level3"="122" or "level3"="123" or "level3"="141" or "level3"="142"'
> --o
> 
> then
> 
> v.to.rast in=corine_ellas_v2_subset out=corine_ellas_v2_subset use=attr
> column=level3
> 
> Hope that helps
> Cheers, Nikos
> 
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