Hi, I have noticed that the ST_centroid() function will compute _geometrically_ correct centroids, but will not always compute _logically_ correct centroids.
For example, given two polygons defining hillslope position such that one polygon defines the "ridge" and another defines the "slope". These two polygons are roughly concentric and therefore the geometric centroid of the outermost polygon is computed to exist somewhere in the innermost polygon. Are there any known ways to make postgis return a logically correct centroid: i.e. in the presence of concentric polygons force the position the centroid to be within the correct polygon. Thanks! Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
