Datum tab

  

The Datum tab is used to select:

  • A reference datum at the beginning of a project
  • A reference datum for new data imports
  • Project Area

Project Datum Reference

Sets the project reference datum, which is critical to correctly projecting all well, seismic, and overlay data.  After changing the datum, it's necessary to select a coordinate system in order to save any changes.  

Changing the project's datum here does not re-project the entire project.  This option on the Datum tab should only be used when setting up the project's map projection before importing any data.
To change the datum of the project, select theAdvanced tab on the Map Projection Settings dialog.

Datum for Data Imports

Recalculates the imported data's latitude and longitude to match the project’s reference datum.  In the example below, the incoming well data's LatLons are based on the NAD27 reference datum, while the project is based on the NAD83 datum.  

Project Area

Sets the list of available reference datums.  The Contiguous US option lists only the datums relevant to the US, while the International option shows all available datums.