![]() For Esri basemaps, this means WGS1984 Web Mercator (auxiliary sphere). ![]() Before any layers are added, the map is soft set to use the basemap coordinate system. This means the first layer that is not a basemap sets the coordinate system for maps and local scenes. ArcGIS Pro Maps and Default Spatial Referencesīy default, Maps in ArcGIS Pro will use the spatial reference of the first operational layer added. It is important to understand how this behaviour works, how to ensure your data in a different datums have correct transformations applied, and what options are available to change default behaviours. The map has a defined spatial reference, and this is what ArcGIS Pro uses as it attempts to align your data to the map. When you work with spatial data in ArcGIS Pro, you add datasets as layers to a Map.
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