[Gdal-dev] Cookie cutting shapefiles in OGR

[Alexandre Leroux]

Hi,

I'm new to the list and started using GDAL/OGR recently :-)

Can someone tell me if I can do the following with OGR: I have two 
shapefiles and need to cookie cut one with the other while keeping the 
attributes of the first shapefile in the newly generated third shapefile.

I saw there is OGRGeometry::Intersection which would allow me to do 
this, but I'd need to verify the intersection of all features from 
shapefile #1 with all features of shapefile #2, which would take days 
and days to compute with OGR (that's what my collegue which knows OGR 
way better told me). Is there a way to cookie cut shapefiles directly at 
the layer level?

This collegue also wonders if speed limitations from the GEOS library 
are affecting other users of OGR.

Thanks for any help!

Alex

http://slashgeo.org
-- 
Alexandre Leroux, M.Sc., Ing.
Environnement Canada / Environment Canada
Centre météorologique canadien / Canadian Meteorological Centre
Division de la réponse aux urgences environnementales /
Environmental Emergency Response Division
alexandre.leroux at ec.gc.ca