To Install the ArcGIS Projection Engine Data

Install the ArcGIS Projection Engine Data before bringing ArcGIS data into your drawing with the Autodesk Connector for ArcGIS. The Projection Engine Data prevents a coordinate offset from occurring when you bring ArcGIS data into a drawing.

Note: To prevent a coordinate offset issue from occurring when you save back to ArcGIS, use a coordinate system that has an EPSG code.

1. Close Civil 3D.
2. Go to https://developers.arcgis.com/downloads/data.
3. Sign in to ArcGIS.
4. From the Supplemental ArcGIS Runtime Data tab, download Projection Engine Data.
5. Unzip the downloaded file to a local folder such as C:\Users\<username>\Downloads.

   By default additional subfolders are added to the folder name when the content is unzipped. For example, C:\Users\<username>\Downloads\ArcGIS_Runtime_Projection_Engine_Data_100_5_0\PEDataRuntime.

6. Click the Windows Start button to display the Search Programs and Files box.
7. Enter regedit and press Enter to open the Registry Editor.
8. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R23.1\ACAD-3000:409.
9. Double-click the registry item ArcGISProjectionDir to open it.
10. For the Value Data, enter the folder that contains the unzipped files, for example, C:\Users\<username>\Downloads\ArcGIS_Runtime_Projection_Engine_Data_100_5_0\PEDataRuntime.
11. Click OK.