GeometryCollectionZ and GeometryCollectionM Data Types
GeometryCollectionZ and GeometryCollectionM have the same properties as GeometryCollection with the exception that GeometryCollectionZ can only contain geometries with a Z coordinate and GeometryCollectionM can only contain geometries with an M coordinate.
Examples:
Without specifying SRID:
CREATE TABLE mishmash1 (name VARCHAR(30), path GEOMETRYCOLLECTIONZ);
CREATE TABLE mishmash2 (name VARCHAR(30), path GEOMETRYCOLLECTIONM);
With specifying SRID:
CREATE TABLE mishmash1 (name VARCHAR(30), path GEOMETRYCOLLECTIONZ SRID 4326);
CREATE TABLE mishmash2 (name VARCHAR(30), path GEOMETRYCOLLECTIONM SRID 4326);
Geometry collections can mix singular Z types:
CREATE TABLE collections1 (id INTEGER PRIMARY KEY, collection GEOMETRYCOLLECTIONZ);
INSERT INTO collections1 (id, collection) VALUES (1, GEOMZFROMTEXT('GEOMETRYCOLLECTIONZ( POLYGONZ ((0 0 5, 10 10 10, 0 10 0, 0 0 5)), POLYGONZ ((0 0 0, 10 10 10, 10 0 5, 0 0 0)))'));
INSERT INTO collections1 (id, collection) VALUES (2, GEOMZFROMTEXT('GEOMETRYCOLLECTIONZ( POLYGONZ ((0 0 5, 10 10 10, 0 10 0, 0 0 5)), POINTZ (50 50 25))'));
Geometry collections can mix singular M types:
CREATE TABLE collections2 (id INTEGER PRIMARY KEY, collection GEOMETRYCOLLECTIONZ);
INSERT INTO collections2 (id, collection) VALUES (1, GEOMMFROMTEXT('GEOMETRYCOLLECTIONM( POLYGONM ((0 0 5, 10 10 10, 0 10 0, 0 0 5)), POLYGONM ((0 0 0, 10 10 10, 10 0 5, 0 0 0)))'));
INSERT INTO collections2 (id, collection) VALUES (2, GEOMMFROMTEXT('GEOMETRYCOLLECTIONM( POLYGONM ((0 0 5, 10 10 10, 0 10 0, 0 0 5)), POINTM (50 50 25))'));
Last modified date: 08/28/2024