Create a Datum Grid File

If you have chosen a coordinate system for your project that uses a datum, and the datum has not been defined yet, you must create it before uploading to a field device.

To do this, find a coordinate system with the appropriate datum to use. If you know of a coordinate system that uses the datum you need, you can select it to combine its .dgf files into a single .cdg file suitable for uploading.

Note: When you download or import data into a project, the datum used by the imported data must correspond with the datum defined for the project's coordinate system.

To create a datum grid:

Select Project Settings in the Quick Access Toolbar. The Project Settings dialog displays.
Click Coordinate System and then Datum Transformation in the left pane.
Review the parameters. You can only create a datum grid file if the Latitude Grid File and Longitude Grid File boxes are shown, and .dgf files are listed in them. If there are, click OK, and proceed to step 9.
If there are no .dgf files shown, click Change at the bottom of the dialog. The Change Coordinate System dialog displays.
Select Recently Used System.
In the list, select the coordinate system that uses the datum you need and click Finish. The Project Settings dialog updates.
Confirm that .dgf files are shown in the Latitude Grid File and Longitude Grid File boxes. These files will be combined into a datum grid file (.cdg) file that you can save and upload to a field device.
Click OK to close the Project Settings dialog.
Do one of the following:
- Select Datum Gridding in Survey > Network.
- In the Device pane, with a device connected, click Tasks and select Upload datum grid (.dgf) file.
The Datum Gridding command pane displays. The .dgf files appear in the Project Datum Grid group.
Click Create at the bottom of the command pane. The Save As dialog displays.
Accept the default file name, and click Save. The datum grid file appears in the Datum Grid Files (.cdg) list. Now it can be uploaded to a field device.