Method for specifying the altitude of a grid point.
| Member | Value | Description |
|---|---|---|
| eAltitudeMethodUnknown | -1 | Unknown altitude method. |
| eAltAboveTerrain | 0 | Altitude above terrain. |
| eAltitude | 1 | Altitude above the surface. |
| eRadius | 2 | Radius from the center of the Earth. |
| eAltitudeAboveMSL | 3 | Altitude above MSL of the surface. |
| eAltitudeDepth | 4 | Depth below the surface. |





