If the large polygon dataset is a true coverage (i.e. is fully noded), then
you do not actually have to union it, but can simply extract all the line
segments and dissolve them. You can either implement the dissolve
operation explicitly (not hard) or use the JTS SegmentStringDissolver.
Then run union between the dissolved linework and the cutting polygon, and
polygonize as before. The union step is still going to be slower than it
needs to be, but it might be faster.
On Mon, Aug 13, 2012 at 3:22 PM, dementiev <dementie...@gmail.com> wrote:
> Thank you for the help.
>
> You are right about valid geometries(our polygons borders inside
> mulipolygon
> touch each other).
>
> We tried to make union(26000 of operations) and then intersects - result
> globally doesn`t changed.
>
> Looking for new ideas :)
>
> Thank you one more time!
>
>
>
> --
> View this message in context:
> http://osgeo-org.1560.n6.nabble.com/intersection-difference-between-Multipolygons-tp4994706p4994965.html
> Sent from the geotools-gt2-users mailing list archive at Nabble.com.
>
>
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--
Martin Davis
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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