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ArcGIS Online Elevation Analysis Services
The Elevation Analysis services provide a group of capabilities for performing analytical operations against data hosted and managed by Esri. This allows you to perform certain common analytical tasks quickly and easily, without having to collect, maintain, or update an authoritative set of base data. The Viewshed Analysis task is used to identify visible areas based on observer locations you provide as well as ArcGIS Online Elevation data.
Analysis Distance:   meters
Observer Offset:   meters