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You can georeference an image base map in the base properties.

You will need to know the X and Y coordinates of the lower left and upper right corners of the image. If you do not know what these are, but instead know the coordinates of points within the image, you can use our Didger software to georeference the image and import it into Surfer, or follow the instructions in our online newsletter article “Calibrating Bitmap Corners from Points Within the Map in Surfer 7” on the last page of Issue 43.

Surfer 10
1. Go to Map | New | Base Map, select your image file and click Open.
2. After the image is loaded, select Base in the Object Manager.
3. In the Property Manager, on the Base Map tab, enter the real world coordinate values for the xMin, xMax, yMin and yMax. The base map is immediately updated with the new coordinates.

Surfer 7, 8, 9
1. Create a base map from your image file (ie. Map | New | Base Map, select the image and click Open).
2. After the image is loaded, double click on Base in the Object Manager.
3. In the Map: Base Properties dialog, on the Base Map tab, type in the real world coordinate values for the xMin, xMax, yMin and yMax.

4. Click OK. Now the base map is referenced in the coordinates you entered.