On Tue, Aug 09, 2011 at 10:28:34PM +0300, Antonio Rodriges wrote: > Thank you, Sandro, > > yes, I clearly understand this, but all my contours are CLOSED and > NONE of them intersects each other. many of them contain each other. > actually, they are like isobars on synoptic map, > > please, see for ex > http://1.bp.blogspot.com/_a1AVUIK5Er8/S27QJhQijOI/AAAAAAAAI88/NUJE11Me6n4/s1600-h/Synoptic+Chart.jpg
The fact that your lines are CLOSED doesn't make them areas. None of the following 2 CLOSED lines contain the other: +-A------+ | | | +B--+ | | | | | | +---+ | | | +--------+ You may want to convert them to polygons if you want to check that "B" is contained by "A": SELECT ST_Contains(ST_MakePolygon(A), ST_MakePolygon(B)); --strk; () Free GIS & Flash consultant/developer /\ http://strk.keybit.net/services.html _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
