The elevation and basemap layers in a scene give context for your operational layers. A basemap layer can provide reference for surrounding areas, and without an elevation layer, all 3D layers will appear on a flat surface at zero elevation.
ArcGIS Runtime SDK apps only support global scenes in WGS 1984 or the Web Mercator Auxiliary Sphere coordinate system. To output a global scene with a Web Mercator Auxiliary Sphere coordinate system, a basemap must be added to the global scene. For more information about creating a basemap in your project, see Author a custom basemap.
Supported raster layers in a basemap include file and geodatabase rasters as well as tile packages.
When creating tile packages, a tiling scheme defines the coordinate system of the package, the levels of detail, and the tile origin for the cache. All elevation tile packages in the ground surface and existing cached layers (such as a tile package or scene layer package) must use the same tiling scheme. The tiling scheme must use the coordinate system of the scene.
The following table lists the supported tiling schemes when creating tile packages for use in a global scene and support for that tiling scheme in ArcGIS Runtime SDK.
|ArcGIS Online/Bing Maps/Google Maps|
|WGS84 Geographic Coordinate System, Version 2|
|CGCS2000 Geographic Coordinate System|
Mobile scenes only allow ground as an elevation surface. The elevation source or sources defining the ground surface must be tile packages using Limited Error Raster Compression (LERC). For more information on working with elevation surfaces, see Elevation surfaces. For detailed steps on creating tile packages with LERC, see Create an offline scene.