[mapserver-users] Getteing the intersection of two layers
Christian Jauvin
cjauvin at gmail.com
Thu Nov 6 08:19:50 PST 2008
Hi Everyone,
I have two layers that I want to intersect: one with points, and one
with multiple polygons representing the regions of a territory.
The first approach I just tried is doing it programmatically, through Python/MS:
I first union all the region polygons, and then get the convex hull of
this super-shape. I then restrict the points to those inside this
convex hull.
The problem is that it is really too slow.. I'm aware that I could do
it through PostGIS, and that performance would surely much better, but
I'd rather stay with a more generic solution, that is applicable to
shapefile data sources as well.
Would someone be aware of a better method, maybe one involving only
mapfile directives?
Thank you,
Christian
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