[GIS] Georeferenced TIF files, can TFW files be created from TFWX files? – (ArcGIS 9.3)

arcgis-9.3arcgis-desktopgeotiff-tiff

I have georeferenced some image TIF files in ArcGIS 9.3. Update Georeferencing creates a *.TFWX file. Renaming to *TFW file does not place the image in the correct spatial location for software packages outside ArcGIS.

Is their a tool? converter? or method that will allow me to extract the correct georeferencing information from TFWX to TFW so that my image can be used in other Mapping platforms?

Best Answer

the answer is : it depends. But usually this is not possible because the tfwx file is only an approximation of the precise transformation using an affine transformation. The transformation is written in the aux.xml file. More details in the arcGIS doc

if the transformation cannot be expressed as a world file, Update Georeference writes the transformation into the aux.xml file and also writes an approximate affine transformation into a text file or a world file with an 'x' on the end of the extension name. For example, a TIFF image with this approximate affine transformation has the extension .tfwx. This is not an exact transformation; it is only an approximation.

If you want a tfw (affine transform), you should "rectify" your image instead of georeferencing it. A new resampled image will then be created, which can be accurately georeference using a world file.

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