Main: Project > Settings > Set Datum Shift for Importing Data
Selects the reference datum for the incoming data. It is common that new data will use a different map projection than existing project. If the reference datums don't match, it is necessary to select the reference datum of the new data. When importing LatLon-based data, it only matters that the reference datums match.
Petra uses the projects coordinate system to automatically calculate XY values. With the new data's reference datum selected, Petra can account for and automatically recalculate the imported data's latitude and longitude to match the project's reference datum.
In the example shown, the incoming well data Lat-Lons are based on the NAD27 reference datum, while the project is based on the NAD83 datum.
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