Hi Jenner - I have implemented your code to geolocate aerial images - and the locations are only somewhat close. I have a centroid located at 35.44752324, -119.0344939 and the UTM comes out as 11N 3925110.67478774, 314745.859021866 - this is about 373 and 741 meters off. The Lat/Lon are in WGS84, and I am loading the resulting UTM Arcmap using NAD83_UTM_Zone11 as my projection. . Thanks for your help