Re: [postgis-users] Casting a point and a polygon to geometry
On 10 July 2012 06:53, Roba Binyahib wrote: > ST_Crosses(geometry g1, geometry g2); > > but I want g1 to be column of points and g2 a column of geometry, so how can > I convert them to geometry enable to use the function By column of "points", do you mean a PostGIS type, or a PostgreSQL type[1]? If it is a PostGIS type, then it is a geometry, with it's own internal type (Point, MultiPoint, Polygon, etc.). > select r.name,u.id from river r, users u where > ST_Crosses(r.point,u.polygon)='T' ; ST_Crosses returns T/F, so you don't need to evaluate " ='T' ". -Mike [1] http://www.postgresql.org/docs/current/static/datatype-geometric.html ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
[postgis-users] Casting a point and a polygon to geometry
Dear all I want to use the following query ST_Crosses(geometry g1, geometry g2); but I want g1 to be column of points and g2 a column of geometry, so how can I convert them to geometry enable to use the function this is my query select r.name,u.id from river r, users u where ST_Crosses(r.point,u.polygon)='T' ; hope you can help thanks --- Best Regards, Roba -- -- This message and its contents, including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email. ___ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
