Hi,
If I have point data that were collected in UTM based on a datum other than WGS1984, can I use the calculate geometry function to get the point value in lat/long or do I first need to project the data and do a datum transformation before I calculate geometry?
I experimented with this by: 1. importing data collected in UTM based on WGS84; 2. creating two fields for the lat/long values; 3. setting the data frame to WGS84; 4. calculated geometry based on data frame with decimal degrees output versus first projecting the imported data to WGS84 before I do steps 1-4, and I get the exact same coordinate value.
I am wondering if this would be the case if the data were collected with UTM based on a local datum. Is it best practice to first project and transform the data before calculating geometry?
Any thoughts?
Thanks,
Carlynne