The data used is maintained by Esri and made available through these tasks. A primary benefit of using these data sources is that a lot of the work has already been done, allowing you to perform analysis instead of worrying about compiling, processing, and storing very large datasets of continental and global scales on your local machine or network.
The following map illustrates the types and coverage of elevation data available for analysis:
An interactive map is a also available for exploring the source data further.
Data source details
The elevation data used for the Elevation analysis tasks is available at four extents and resolutions. The elevation source data was created in a spherical coordinate system with units of arc seconds. To simplify understanding, it's referred to in the services by its commonly used meters approximation.
- 10 meter (1/3 arc second) resolution elevation raster for the continental United States from the USGS National Elevation Dataset.
- 30 meter (1 arc second) resolution elevation raster data sources for the following regions are:
- United States, Canada, and Mexico, from the USGS National Elevation Dataset
- Africa, South America, most of Europe and continental Asia, the East Indies, New Zealand, and islands of the western Pacific between 60 degrees north and 56 degrees south, from the Shuttle Radar Topography Mission (SRTM)
- Australia, based on the SRTM DEM-S dataset from Geoscience Australia
- 90 meter (3 arc seconds) resolution elevation raster for the land surface of the world between 60 degrees north and 56 degrees south, from the Shuttle Radar Topography Mission, SRTM.
- 1000 meter (30 arc seconds) resolution elevation raster for the world from GEBCO.
The services do not combine data or resolutions. For example, the services will not create a result that combines 30 meter data in the United States with 90 meter data from Canada. The exception is the Profile task, which uses the GEBCO data for ocean bathymetry regardless of the chosen resolution. These depths should be used only to provide context, not for navigation. For the Viewshed task, oceans have an elevation of zero. For the Summarize Elevation task, oceans and major seas of the world are not considered in the calculation.