I am using ArcGIS Enterprise 11.5. Our default basemap is in NAD27. Therefore, any new maps in Portal have a NAD27 basemap.
I have published a new tiled image cache service in NAD83. I wish to make a web map using this imagery so that is an available basemap in Portal and ArcGIS Pro.
I open a new map, which has our default NAD27 basemap already loaded. I add the NAD83 image layer to the map. I move the new layer to the basemaps section. I remove the old basemap. My map has no layers and no tables, and only one layer in the basemaps section. I try to save the map but get this error:
Failed to save map
The layer, Untitled map, cannot be saved.
I have also tried this: I open the web item page of the imagery layer and click Open in Map Viewer. Again, I move that layer to the basemaps section, remove the old basemap from that section, and attempt to save. I get the same error as before.
I suspect that my issue has to do with coordinate systems. But since I can't tell the map what coordinate system I want to use, and I can't open a map with no basemap at all, I feel stuck.
How can I make my new NAD83 image serve an available basemap in Enterprise without getting an error when trying to save the web map?
