How do I change the map coordinates in a DXF file within Surfer?
A. You can use the page coordinates of two calibration points with known map coordinates on your map to create a new DXF with the changed coordinates. Use the File | Import menu to load the DXF file and display it without axes. 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. Choose the File | Export menu, and specify a new file name with the .DXF extension to display the AutoCAD DXF Export dialog box. Type in the page coordinates under the “Page Rectangle” area and the corresponding map coordinates under the “DXF Rectangle” area. Although the labels say Lower Left and Upper Right, these two points can be anywhere on the map. Set the Scaling Source to Application, Format to ASCII, and uncheck all the check boxes in the lower left corner. Click OK to create the new DXF file. To load the file into Surfer with map coordinates, use the Map | L
