It is recommended to 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 due to any datum transformation occurring when you bring ArcGIS data into a drawing. This offset due to datum transformation may occur when using coordinate systems that do not have an EPSG code or if any data transformation occurs between coordinate systems.
Note: To prevent a coordinate offset issue from occurring when you save back to ArcGIS,
use a coordinate system that has an EPSG code.
- Close Civil 3D.
- Go to https://developers.arcgis.com/downloads.
- In the ArcGIS Maps SDKs section, click ArcGIS Maps SDK for Qt.
- In the Projection Engine Data section, download the latest version compatible with your version of Civil 3D.
- 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_200_2_0\pedata.
- Click the Windows Start button to display the Search Programs and Files box.
- Enter regedit and press Enter to open the Registry Editor.
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\<version>\ACAD-<version>. For example, HKEY_LOCAL_MACHINE\SOFTWARE\Autodesk\AutoCAD\R24.1\ACAD-5100:409.
- Double-click the registry item ArcGISProjectionDir to open it.
Note: If this registry item does not exist, create a new String Value in that location named ArcGISProjectionDir.
- For the Value Data, enter the folder that contains the unzipped files, for example, C:\Users\<username>\Downloads\ArcGIS_Runtime_Projection_Engine_Data_200_2_0\pedata.
- Click OK.