Modifying or Deleting a Datum
Concept Procedure Quick Reference

To modify or delete a datum

  1. On the General tab of the Define Global Coordinate System dialog box or the Modify Global Coordinate System dialog box, select Geodetic. Click Define.

    Click Map Setup tabCoordinate System panelDefine Global Coordinate System. At the Command prompt, enter ADEDEFCRDSYS. Select Define or Modify.

  2. In the Datum Manager dialog box, select a datum.
  3. To modify the datum, click Modify.

    To remove the datum, click Remove.

  4. If you are modifying the datum, on the General tab of the Define Datum dialog box, change the code and description for the datum.

    To modify a predefined datum, you must change the code on the General tab before you can change the other datum properties.

  5. Under Ellipsoid, select or define an ellipsoid to use for the datum.

    For information about defining ellipsoids, see Defining an Ellipsoid.

  6. On the Datum Conversion tab, select a conversion technique from the Datum Conversion Technique list.
  7. Enter the appropriate conversion parameters for the conversion technique you selected.