Hi, I am running the current setup: "POSTGIS="2.0.2 r10789" GEOS="3.4.0dev-CAPI-1.8.0" PROJ="Rel. 4.7.1, 23 September 2009" GDAL="GDAL 1.9.0, released 2011/12/29" LIBXML="2.7.8" (core procs from "2.0.1 r9979" need upgrade) RASTER (raster procs from "2.0.1 r9979" need upgrade)"
I have two tables with geometries. Both include polygons representing administrative units. One at the first level and one at the second level. I want a table that includes all the second level polygons where available, and where not available I want the first level polygons. To find the level 1 polygons for filling the gaps where level 2 is N/A, I thought about finding where the centroid of level one polygons does not intersects with the polygons for level 2. Hence, I tried: SELECT g1.name, g1.geom INTO gadm2_level1_union_selected FROM gadm2_level1_union g1, gadm2_level2_union g2 WHERE ST_Intersects(g1.centroid, g2.geom)=FALSE; I also tried the ST_Disjoint(g1.centroid, g2.geom). My problem is that this is running for ages without finishing. This should be such a simple query, but I have used half of the day running it. If I take the two geometries into PostGIS and run a spatial query to find the points from level 1 not intersecting with polygons of level 2, it takes 15 seconds. What could be the issue with my query? Thanks! Andreas
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