- Expand the Base layer in the Contents window and select the Image.
- Click Map Tools | Layer Tools | Georeference Image (or click the Georeference Image button in the Properties window). The Georeference Image window appears.
- To calibrate the image using the corner point locations, click Edit | Add Control Points At Corners. If you don't know the real world coordinates for the four corner points, click Tools | Add Mode and click on the image in the known point locations. A row will appear in the calibration points table for each location clicked.
- In the calibration points table below the image, enter the real-world X and Y coordinates of each calibration point in the Target X and Target Y columns.
Surfer's Georeference Image window with four calibration points at the image corners.
- If desired, change the warp method by clicking the Edit | Set Warp Method and then clicking the desired method.
- Click the Update Map button () in the toolbar.
- When you're done with the Georeference Image window, you can click File | Close to close it, though you can work in Surfer without closing this window.
- If the image should have a coordinate system assigned to it, select the Base layer in the Contents window and click the Coordinate System tab in the Properties window.
- Click the Set button.
- In the Assign Coordinate System dialog, select the coordinate system that corresponds to the Target X and Target Y coordinates you entered into the Georeference Image window.
- Click OK to apply the coordinate system to the base map layer.
For additional details on the georeference functionality and tools, review this knowledge base article, A detailed look at how to georeference (assign coordinates to) an image in Surfer
To georeference an image with corner coordinates in Surfer 13 and earlier versions, you can use these steps:
- In the Object Manager select the Base layer object.
- In the Property Manager click the General tab.
- Under the Image Coordinates section, enter the correct xMin, xMax, yMin, and yMax coordinate values in real world units.
For more information on the georeferencing tools, review the online help on georeferencing images
If you do not know the real-world coordinates of the corners of your image, but instead know the coordinates of three or more points within the image, you can:
- Follow the steps in this knowledge base article to georeference the image in Surfer 14: A detailed look at how to georeference (assign coordinates to) an image in Surfer
- Follow the instructions in this knowledge base article to georeference the image in Surfer 13 or previous using an Excel table: Georeference an Image in Surfer 13 or previous using Internal Points
- Use our Didger software to georeference the image and import it into Surfer.
- Follow the instructions in the attached Issue43Surfer.pdf. The instructions are written for Surfer 7, but apply to higher versions as well.
Updated October 24, 2017