The Build Elevation Mosaic Tools toolbox
Building mosaic dataset makes it simple to publish collections of elevation data files as elevation, slope, aspect, and hillshade layer services, so they do not have to be re-created for each use. This approach reduces data duplication because the source files do not need to be copied to be used in the mosaic dataset. They can be used from their existing locations as long as ArcGIS for Server can access them as a data store.
When publishing the results, you can reduce the number of services by applying the raster function templates included with the tools in this toolbox. These function templates modify pixel values on the fly to show derived views of the elevation data, such as percent slope, aspect, and hillshade. The client simply chooses which function to view from the DTM service.
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https://github.com/Esri/solutions-geoprocessing-toolbox/releases/tag/v10.2.2.1