PostGIS
Name
ST_LocateBetweenElevations — Returns the portions of a geometry that lie in an elevation (Z) range.
Synopsis
geometry +`*`+ST_LocateBetweenElevations*(`geometry `geom,
float8 elevation_start, float8 elevation_end`)`;
Description
Returns a geometry (collection) with the portions of a geometry that lie in an elevation (Z) range.
Clipping a non-convex POLYGON may produce invalid geometry.
Availability: 1.4.0
Enhanced: 3.0.0 - added support for POLYGON, TIN, TRIANGLE.
This
function supports 3d and will not drop the z-index.
Examples
SELECT ST_AsText(
ST_LocateBetweenElevations(
'LINESTRING(1 2 3, 4 5 6)'::geometry,
2, 4 ));
st_astext
-----------------------------------
MULTILINESTRING Z ((1 2 3,2 3 4))
SELECT ST_AsText(
ST_LocateBetweenElevations(
'LINESTRING(1 2 6, 4 5 -1, 7 8 9)',
6, 9)) As ewelev;
ewelev
-----------------------------------------------------------------------
GEOMETRYCOLLECTION Z (POINT Z (1 2 6),LINESTRING Z (6.1 7.1 6,7 8 9))