PostGIS 1.5.8 Manual - Fedora Project Packages GIT repositories

PostGIS 1.5.8 Manual243 / 310SELECT ST_AsEWKT(the_geom)FROM(SELECT ST_Locate_Between_Measures(ST_GeomFromEWKT(’MULTILINESTRINGM((1 2 3, 3 4 2, 9 4 3),(1 2 3, 5 4 5))’),1.5, 3) As the_geom) As foo;st_asewkt-----------------------------------------------------------------GEOMETRYCOLLECTIONM(LINESTRING(1 2 3,3 4 2,9 4 3),POINT(1 2 3))--Geometry collections are difficult animals so dump them--to make them more digestableSELECT ST_AsEWKT((ST_Dump(the_geom)).geom)FROM(SELECT ST_Locate_Between_Measures(ST_GeomFromEWKT(’MULTILINESTRINGM((1 2 3, 3 4 2, 9 4 3),(1 2 3, 5 4 5))’),1.5, 3) As the_geom) As foo;st_asewkt--------------------------------LINESTRINGM(1 2 3,3 4 2,9 4 3)POINTM(1 2 3)See AlsoST_Dump, ST_Locate_Along_Measure7.10.6 ST_LocateBetweenElevationsST_LocateBetweenElevations — Return a derived geometry (collection) value with elements that intersect the specified range ofelevations inclusively. Only 3D, 4D LINESTRINGS and MULTILINESTRINGS are supported.Synopsisgeometry ST_LocateBetweenElevations(geometry geom_mline, float elevation_start, float elevation_end);DescriptionReturn a derived geometry (collection) value with elements that intersect the specified range of elevations inclusively. Only 3D,3DM LINESTRINGS and MULTILINESTRINGS are supported.Availability: 1.4.0This function supports 3d and will not drop the z-index.ExamplesSELECT ST_AsEWKT(ST_LocateBetweenElevations(ST_GeomFromEWKT(’LINESTRING(1 2 3, 4 5 6)’),2,4)) As ewelev;ewelev----------------------------------------------------------------MULTILINESTRING((1 2 3,2 3 4))SELECT ST_AsEWKT(ST_LocateBetweenElevations(