The spatial reference for this map or scene. SpatialReference specifies how geometry coordinates relate to real-world space. It ensures that you can accurately view, query, and analyze the layers of a map or scene.

The spatial reference value is null until the ArcGISMap or ArcGISScene is loaded. You can set this value explicitly using the ArcGISMap.ArcGISMap(SpatialReference) or ArcGISScene.ArcGISScene(SceneViewTilingScheme) constructors.