# HeightReference

Scene/HeightReference.js 6
Represents the position relative to the terrain.

##### Properties:

Name | Type | Description
--- | --- | ---
`NONE` | Number | The position is absolute.
`CLAMP_TO_GROUND` | Number | The position is clamped to the terrain.
`RELATIVE_TO_GROUND` | Number | The position height is the height above the terrain.

### Members

#### static constant Cesium.HeightReference.CLAMP_TO_GROUND : Number
Scene/HeightReference.js 19

The position is clamped to the terrain.

Default Value: `1`

#### static constant Cesium.HeightReference.NONE : Number
Scene/HeightReference.js 12

The position is absolute.

#### static constant Cesium.HeightReference.RELATIVE_TO_GROUND : Number
Scene/HeightReference.js 26

The position height is the height above the terrain.

Default Value: `2`