PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual116 / 310DescriptionReturn the X coordinate of the point, or NULL if not available. Input must be a point.NoteIf you want to get the max min x values of any geometry look at ST_XMin, ST_XMax functions.This method implements the SQL/MM specification. SQL-MM 3: 6.1.3This function supports 3d and will not drop the z-index.ExamplesSELECT ST_X(ST_GeomFromEWKT(’POINT(1 2 3 4)’));st_x------1(1 row)SELECT ST_Y(ST_Centroid(ST_GeomFromEWKT(’LINESTRING(1 2 3 4, 1 1 1 1)’)));st_y------1.5(1 row)See AlsoST_Centroid, ST_GeomFromEWKT, ST_M, ST_XMax, ST_XMin, ST_Y, ST_Z7.4.30 ST_YST_Y — Return the Y coordinate of the point, or NULL if not available. Input must be a point.Synopsisfloat ST_Y(geometry a_point);DescriptionReturn the Y coordinate of the point, or NULL if not available. Input must be a point.This method implements the OpenGIS Simple Features Implementation Specification for SQL 1.1.This method implements the SQL/MM specification. SQL-MM 3: 6.1.4This function supports 3d and will not drop the z-index.