Hello, I'm busy to work on an application where the user can select (with precision) an area on a map (for example the contours of a lake) and I have to retrieve all the data (specimen observations) within this area.
I have a list of coordinates pair [(lat1, long1), (lat2, long2), (lat3, long3), (..., ...)] which form a polygon. In my database every specimen has a pair of coordinates where it has been collected. Is there an SQL function to check if a point is contained in a polygon shape (before I start to write my own) ? I tried something like : rodentia=> select point '(-8,25)' <@ polygon '((-3,10),(8,18),(-3,30),(-10,20))'; ERROR: operator does not exist: point <@ polygon HINT: No operator matches the given name and argument type(s). You may need to add explicit type casts. ... but without success as you can see ;\ In advance thanks, Julien -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: [EMAIL PROTECTED] @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52 -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
