PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual125 / 310DescriptionConverts the geometry into a GEOMETRYCOLLECTION. This is useful for simplifying the WKB representation.Availability: 1.2.2, prior to 1.3.4 this function will crash with Curves. This is fixed in 1.3.4+This function supports 3d and will not drop the z-index.This method supports Circular Strings and CurvesExamplesSELECT ST_AsEWKT(ST_Force_Collection(’POLYGON((0 0 1,0 5 1,5 0 1,0 0 1),(1 1 1,3 1 1,1 3 ←↪1,1 1 1))’));st_asewkt----------------------------------------------------------------------------------GEOMETRYCOLLECTION(POLYGON((0 0 1,0 5 1,5 0 1,0 0 1),(1 1 1,3 1 1,1 3 1,1 1 1)))SELECT ST_AsText(ST_Force_Collection(’CIRCULARSTRING(220227 150406,2220227 150407,220227150406)’));st_astext--------------------------------------------------------------------------------GEOMETRYCOLLECTION(CIRCULARSTRING(220227 150406,2220227 150407,220227 150406))(1 row)←↪See AlsoST_AsEWKT, ST_Force_2D, ST_Force_3DM, ST_Force_3D, ST_GeomFromEWKT7.5.9 ST_ForceRHRST_ForceRHR — Forces the orientation of the vertices in a polygon to follow the Right-Hand-Rule.Synopsisboolean ST_ForceRHR(geometry g);DescriptionForces the orientation of the vertices in a polygon to follow the Right-Hand-Rule. In GIS terminology, this means that the areathat is bounded by the polygon is to the right of the boundary. In particular, the exterior ring is orientated in a clockwise directionand the interior rings in a counter-clockwise direction.This function supports 3d and will not drop the z-index.