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My image disappears when I try to georeference it in Surfer.

Q: I import an image as a base map into Surfer 13 (and older versions), click on the image to select it and set the coordinates for the spatial extents for the image, but then the image disappears. Why?

A:  Surfer 14 does not exhibit this behavior. When you load a non-georeferenced base map, Surfer automatically assigns a coordinate system that corresponds to the rows and columns of the image, often pixel coordinates, to both the image and the base layer.  If you just reset the spatial extents for the imported image (and not the base layer), the image moves within the base layer frame so you cannot see it.

You can reset the image coordinates to real world coordinates (i.e. georeference the image) by specifying the base layer coordinates instead of the spatial extents of the image. Resetting the base layer coordinates automatically also updates the coordinates for the image. To do this in surfer 13 (and older versions):

  1. Add or create the base layer from the image file. For example, click Map | New | Base Map, select an unreferenced image file, and click Open.
  2. In the Object Manager select the Base layer.
  3. In the Property Manager click the General tab.
  4. Under the Image Coordinates section, enter the correct xMin, xMax, yMin, and yMax coordinate values. The base layer and the image inside of it have both been updated to the new coordinates.

If you want to set the coordinate system:

  1. Click the Coordinate System tab in the Property Manager.
  2. Click Set next to Coordinate System.
  3. In the Assign Coordinate System dialog, select the appropriate coordinate system.
  4. Click OK.

 

Updated February 13, 2017

 

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