[postgis-users] Why PostGIS ST_Intersection much slower than ArcGIS Intersect ?
jeff at michiganwxsystem.com
Thu Nov 29 06:14:40 PST 2012
Must have something to do with windows and or memory ..
I use ST_Intersects daily on a Linux Server (PostGIS 2.0, PG 9.1.6) with
a quad core Xeon and 16gb memory
it takes milliseconds on much larger layers ..
On 11/28/2012 16:22, Étienne Desgagné wrote:
> I don't want to denigrate PostGIS in any way and I know that my
> comparison may be wrong but I'm trying to understand why a basic
> ST_Intersection of two relatively small layers (< 1000 polygons) take
> about 1m40 sec in PostGIS(2.0 on PG 9.2 on Windows) while applying the
> ArcGIS Intersect on same layers and machine take about 2 sec?
> I'm aware of some PostgreSQL tuning settings but even applying basic
> tuning recommendation for PostGIS I'm facing the same problem...
> My two layers also have a spatial index.
> Is it normal behavior? Any suggestion for reaching better performance?
> Note that I'm also using ST_Intersects on the join to filter only
> intersecting features...
> Thanks a lot
> postgis-users mailing list
> postgis-users at lists.osgeo.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the postgis-users