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How do I change the projection of an image georeferenced with an ESRI World File (.TFW) using Didger?

Georeferenced TIF files commonly save the spatial reference information in an ESRI World File (*.tfw). You cannot directly convert the projection of the image georeferenced with a TFW file because TFW files do not contain any projection information. TFW files only contain coordinate information.

The steps necessary to assign a projection to the georeferenced image file, convert the projection, and overlay it with other data files in Didger 3 are outlined in the attached newsletter article: Changing the Projection of an Image with an ESRI World File.pdf.

In Didger 4, go to File | Import, select the TIF file and click Open. In the Tagged Image (TIFF) Spatial References dialog, select ESRIWorld file for the Georeference Sources and click OK. In the Specify Image Projection dialog, select the correct projection and settings and click OK. The image is imported with the coordinates from the TIF file and in the selected projection.

In Didger 5, go to File | Import, select the TIF file and click Open. In the Assign Coordinate System dialog, select the correct projection and settings and click OK. The image is imported with the coordinates from the TIF file and in the selected projection.

See Also:
All the projection information is lost when I import the image into Didger using an ESRI World file (TFW)

Updated October 19, 2016

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