Options for specifying the direction in which the sensor's field of view crosses the specified altitude.
| Member | Value | Description | 
|---|---|---|
| eDirectionUnknown | -1 | Unknown. | 
| eDirectionEither | 0 | Either - Crossing can occur in either direction. | 
| eDirectionInsideOut | 1 | Inside Out - Crossing occurs from lower altitudes to higher altitudes. | 
| eDirectionOutsideIn | 2 | Outside In - Crossing occurs from higher altitudes to lower altitudes. | 





