PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual115 / 3107.4.28 ST_SummaryST_Summary — Returns a text summary of the contents of the ST_Geometry.Synopsistext ST_Summary(geometry g);DescriptionReturns a text summary of the contents of the geometry.This function supports 3d and will not drop the z-index.ExamplesSELECT ST_Summary(ST_GeomFromText(’LINESTRING(0 0, 1 1)’)) As good_line,ST_Summary(ST_GeomFromText(’POLYGON((0 0, 1 1, 1 2, 1 1, 0 0))’)) As bad_poly--resultsgood_line | bad_poly----------------------+-------------------------|Line[B] with 2 points : Polygon[B] with 1 rings: ring 0 has 5 points:--3d polygonSELECT ST_Summary(ST_GeomFromEWKT(’LINESTRING(0 0 1, 1 1 1)’)) As good_line,ST_Summary(ST_GeomFromEWKT(’POLYGON((0 0 1, 1 1 2, 1 2 3, 1 1 1, 0 0 1))’)) As poly--resultsgood_line | poly----------------------+-------------------------|Line[ZB] with 2 points : Polygon[ZB] with 1 rings: ring 0 has 5 points:See AlsoST_IsValid, ST_IsValidReason7.4.29 ST_XST_X — Return the X coordinate of the point, or NULL if not available. Input must be a point.Synopsisfloat ST_X(geometry a_point);