4D data types exist in a four-coordinate dimension space, where the four coordinates are x (longitude), y (latitude), z (generally elevation above or below sea level), and m (an application-specific measurement).

The z and m values are considered in geometric calculations and in the generation of some new geometry values.

Each function description indicates whether it supports 4D types.

To convert geometries from WKT or WKB into Ingres geometries you must use the appropriate function. In this case, use GeomZMFromText and GeomZMFromWKB.

4D types include: