I have two tables of MULTIPOLYGONS to which I apply a negative buffer and relate to see how they overlap. (The buffer is necessary to accommodate errors where the boundaries should coincide.)
With PostGIS 1.4, this worked: ST_Relate(ST_Buffer(geom1, -.0005), ST_Buffer(geom2, -.0005), 'T********') I upgraded to PostGIS 1.5 and now I get the error: ERROR: Relate Operation called with a LWGEOMCOLLECTION type. This is unsupported. All geometries in the tables return geometry type MULTIPOLYGON. It seems that ST_Buffer on the MULTIPOLYGONs returns geometries of type POLYGON, MULTIPOLYGON and GEOMETRYCOLLECTION. Am I doing something wrong or is this a bug? System info: PostgreSQL 8.3 POSTGIS="1.5.1" GEOS="3.2.0-CAPI-1.6.0" PROJ="Rel. 4.6.1, 21 August 2008" LIBXML="2.7.6" USE_STATS Windows XP Thanks, Sean _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
