[Gdal-dev] Cookie cutting shapefiles in OGR

[Chapman, Martin]

Thank you for the information Markus.  I will look into that.

Martin

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of Markus Neteler
Sent: Wednesday, July 05, 2006 5:59 AM
To: gdal-dev at lists.maptools.org
Subject: Re: [Gdal-dev] Cookie cutting shapefiles in OGR

On Sun, Jul 02, 2006 at 04:18:36PM -0400, Frank Warmerdam wrote:
...
> You might want to look at options for doing this in GRASS.  I believe
it
> has some sort of layer overlay operation (perhaps done in the raster
> domain?).

You can do it both in the raster or vector domain.
Since vector was asked:
 http://grass.itc.it/grass61/manuals/html61_user/v.overlay.html
 http://grass.itc.it/grass61/manuals/html61_user/v.select.html

Operators are
    and : also known as 'intersection' in GIS
    or :  also known as 'union' in GIS (only for atype=area)
    not : features from ainput not overlayed by features from binput
    xor : features from either ainput or binput but not those from
ainput overlayed 
          by binput (only for atype=area)

As a script solution, you can put everything into a shell script which
internally launches GRASS:
- v.in.ogr: import
- v.overlay: operation
- v.out.ogr: export

For details, see
 http://grass.gdf-hannover.de/wiki/GRASS_and_Shell

Regards,

 Markus
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