# MapProjection

#### new Cesium.MapProjection()
Core/MapProjection.js 20

  Defines how geodetic ellipsoid coordinates (`Cartographic`) project to a flat map like Cesium's 2D and Columbus View modes.

  ##### See:

  - GeographicProjection
  - WebMercatorProjection

### Members

#### readonlyellipsoid : Ellipsoid
Core/MapProjection.js 33

  Gets the `Ellipsoid`.

### Methods

#### project(cartographic, result) → Cartesian3
Core/MapProjection.js 51

  Projects `Cartographic` coordinates, in radians, to projection-specific map coordinates, in meters.

  Name | Type | Description
  --- | --- | ---
  `cartographic` | Cartographic | The coordinates to project.
  `result` | Cartesian3 | optional An instance into which to copy the result. If this parameter is undefined, a new instance is created and returned.

  ##### Returns:

  The projected coordinates. If the result parameter is not undefined, the coordinates are copied there and that instance is returned. Otherwise, a new instance is created and returned.

#### unproject(cartesian, result) → Cartographic
Core/MapProjection.js 67

  Unprojects projection-specific map `Cartesian3` coordinates, in meters, to `Cartographic` coordinates, in radians.

  Name | Type | Description
  --- | --- | ---
  `cartesian` | Cartesian3 | The Cartesian position to unproject with height (z) in meters.
  `result` | Cartographic | optional An instance into which to copy the result. If this parameter is undefined, a new instance is created and returned.

  ##### Returns:

  The unprojected coordinates. If the result parameter is not undefined, the coordinates are copied there and that instance is returned. Otherwise, a new instance is created and returned.