New to ArcGIS Pro – I want to add a spatial reference to a raster file I have downloaded (in this case from Nearmap.com). When I click properties of the raster file through the new project TAB in ArcGIS Pro I can not edit/change the spatial reference. You should be able to do this in ArcGIS Pro 1.0 by using the ANALYSIS tab to click the Tools button and open the Geoprocessing pane to find and load the Define Projection tool: This tool overwrites the coordinate system information (map projection and datum) stored with a dataset. The only use for this tool is for datsets that have an unknown or incorrect coordinate system defined. The solution is to add a dummy layer. We can create a ‘fake’ feature layer from JSON to trick the map into the desired projection. This feature layer should have the target spatial reference. You can get an estimate for an appropriate spatial grid index by using CalculateDefaultGridIndex on the input dataset. Then temporarily set the SpatialGrid1 and, as necessary, SpatialGrid2 and SpatialGrid3 environments. This will help provide indexes that are appropriate when running the tool. Reset the environments to their previous setting when finished. The tool failed to write records to the output feature class or table. This error is typically the result of mismatched field definitions between incoming features and the output feature class or table. Where possible, adjust the input field properties to be consistent with the expected output field properties. Source.