There is not a direct way to change the coordinates of a DXF file (please email firstname.lastname@example.org to add your vote to this request), but there is a workaround.
Use the page coordinates of two calibration points with known map coordinates on your map to create a new DXF with the changed coordinates.
- Click File | Import, select the DXF file and click Open to load the DXF file and display it without axes or map coordinates.
- Zoom in on the first known point and write down the XY page coordinates from the status bar at the bottom of the plot window.
- Zoom out, scroll to the next point and write down the page coordinates for the second known point.
- Choose File | Export, give the file a new name, choose to export it as an AutoCAD DXF Drawing file, and click Save.
- In the Export Options dialog, on the Scaling page, enter the two sets of page coordinates in the Page Rectangle boxes.
- Enter the corresponding map coordinates under the File Rectangle boxes.
- Although the dialogue box prompts for the Lower Left and Upper Right points, you may enter any two map points.
- Click OK to create the new DXF file.
- To load the file into Surfer with map coordinates, click Home | New Map | Base, select the DXF file and click Open.
Updated February 13, 2017