The World Elevation services provide online access to global collections of multiresolution and multisource elevation data. This collection includes data with resolutions ranging from 230 meters to 3.1 meters. The services provide a single endpoint for desktop and web applications to access elevation values, derived products, and geoprocessing tools.
You can use the services in your desktop and web applications as follows:
These image services support visualization and analysis, with different services optimized for different purposes. They provide access to the raw elevation data or derived products (for example, hillshade) without needing to store, compile, and process the source data on your local machine. They are available on ArcGIS Online. See the Elevation Layers group for access to the entire collection.
The image services provided for visualization can be used as base images in your desktop applications, such as ArcMap, or in web applications to provide context for other layers. The recommended services include the following:
The image services provided for analysis can be used by software applications as a data source for their own analysis or to store a local copy of an area of the elevation data to process other imagery, such as performing an orthorectification. The recommended services for analysis include the following:
The server-side geoprocessing tools allow the user to control the area of interest and tool parameters, perform all processing on the server, and then transmit only the output to the client software. Since the elevation data is a large data volume, transmitting only the results from server to client (as a feature class or array of numeric values) is much faster than downloading the raw data and performing local analysis. The geoprocessing tools include the following:
To learn more about the elevation tools, see Overview of the Elevation Analysis services.
There are several example applications available on ArcGIS Online to demonstrate how you can work with the World Elevation image services. One is the World Elevation Reviewer, a sample web application created using Microsoft Silverlight for exploring the World Elevation services.
The source elevation data is composed of the best available elevation data and samples from public domain sources. The data providers include the following:
The data sources include National Elevation Dataset (NED), Shuttle Radar Topography Mission (SRTM), and Global Multi-resolution Terrain Elevation Data (GMTED). They range in resolution from 230 meters to 3.1 meters. Not all datasets cover the entire earth’s surface.
If you have data you would like to contribute, contact firstname.lastname@example.org.