Null Datum Transformations

By default, Geographic Calculator allows conversions with no datum transformation. When the user selects from the list of possible datum transformations, <none> will be one of the options. If <none> is selected, there will be no transformation applied, and the result may not be accurate. To prevent this, you can select "Do not allow null datum transformations" in the Administrative Settings.

1. Select Options>Administrative Settings and go to the Geodetic tab.
   
   

2. Clicking the checkbox for Do not allow null coordinate transformations will prevent users from selecting <none> as the transformation between two systems. Sources and Targets with no valid coordinate transformations will not be processed.