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Combining Layers in a Basemap

Question asked by ThompsonMS on Nov 1, 2017
Latest reply on Nov 1, 2017 by MBranscomb-esristaff

On the Developers web page at:

Build a new map—ArcGIS Runtime SDK for .NET | ArcGIS for Developers 


is the following topic:

Combining layers into one basemap

You can also combine a number of layers to create a single basemap as long as these layers have the same spatial reference

However, the two ArcGIS Online layers included in the sample code under that topic appear to have different Spatial Reference WKId's. So, what constitutes "same spatial reference"?