Terrain - Ellipsoidal Height

This layer provides approximate ellipsoidal heights calculated dynamically using a server-side function that adds EGM2008 geoid heights to orthometric heights from the Terrain layer. The transformed ellipsoidal heights are referenced to WGS84 ensemble (WKID:6326). Height units: Meters Update Frequency: Quarterly Coverage: World/Global Data Sources: This layer is compiled from a variety of best available sources from several data providers. To see the coverage and extents of various datasets comprising this service in an interactive map, see World Elevation Coverage Map. What can you do with this layer? Use for Visualization: This layer is generally not optimal for direct visualization. By default, 32 bit floating point values are returned, resulting in higher bandwidth requirements. Therefore, usage should be limited to applications requiring elevation data with ellipsoidal heights. For visualizations such as hillshade, elevation tinted hillshade, and slope consider using the appropriate server-side function defined on this service. Use for Analysis: Yes. This can be used for applications that require processing, such as orthorectifying satellite imagery using RPCs that are usually referenced to ellipsoidal heights. If using the ellipsoidal height to orthorectify an image in ArcGIS, verify that the option to apply a geoid height correction is not enabled. As an alternative to directly using the service, consider exporting small sections. There is a limit of 5000 rows x 5000 columns. NOTE: This layer combines data from different sources and resamples the data dynamically to the requested projection, extent and pixel size. For analyses requiring the highest accuracy, when using ArcGIS Pro, you will need to use native coordinates and specify the native resolutions (refer to the table under Data Sources in the Terrain service description) as the cell size geoprocessing environment setting and ensure that request is aligned with the source pixels. For more details such as Data Sources, Mosaic method used in this layer, please see the Terrain layer. This layer allows query, identify, and export image requests. The layer is restricted to a 5,000 x 5,000 pixel limit in a single export image request. This layer is part of a larger collection of elevation layers that you can use to perform a variety of mapping and analysis tasks.