PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual265 / 310Examples--This example drops bounding boxes where the cached box is not correct--The force to ST_AsBinary before applying Box2D forces a recalculation of the box,and Box2D applied to the table geometry always-- returns the cached bounding box.UPDATE sometableSET the_geom = PostGIS_DropBBox(the_geom)WHERE Not (Box2D(ST_AsBinary(the_geom)) = Box2D(the_geom));←↪UPDATE sometableSET the_geom = PostGIS_AddBBox(the_geom)WHERE Not PostGIS_HasBBOX(the_geom);See AlsoPostGIS_AddBBox, PostGIS_HasBBox, Box2D7.13.3 PostGIS_HasBBoxPostGIS_HasBBox — Returns TRUE if the bbox of this geometry is cached, FALSE otherwise.Synopsisboolean PostGIS_HasBBox(geometry geomA);DescriptionReturns TRUE if the bbox of this geometry is cached, FALSE otherwise. Use PostGIS_AddBBox and PostGIS_DropBBox tocontrol caching.This method supports Circular Strings and CurvesExamplesSELECT the_geomFROM sometable WHERE PostGIS_HasBBox(the_geom) = false;See AlsoPostGIS_AddBBox, PostGIS_DropBBox