2009/11/23 Henri De Feraudy <[email protected]> > > Hi, > I'm working in planar coordinates. I have a Postgis database and > for starters I want to limit my attention to all geometries that intersect a > given rectangle (the "selection"). > I can imagine that one could enumerate all geometries and ask in each case if > they > intersect the rectangle, but that doesnt seem very efficient, so what do you > suggest?
Use ST_Intersects > I only need general guidance so I can look at the various parts of the doc. > Later I'll be wanting to clip the geometies with this selection. > Still later I'll want to consider polygonal selections. > By the way I'm accessing the PostGis database via LibPQ and have written my > application > in Qt. > > Thanking you in advance > Henri > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- Brian Modra Land line: +27 23 5411 462 Mobile: +27 79 69 77 082 5 Jan Louw Str, Prince Albert, 6930 Postal: P.O. Box 2, Prince Albert 6930 South Africa http://www.zwartberg.com/ _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
