Choosing a new spatial reference for an instance (Aviation)

You can choose a new spatial reference to use with an instance in the New Instance or the Instance Properties dialog box. You also have the option to choose an existing spatial reference.

Etapes :

1. Start ArcMap.
2. If you do not have the New Instance dialog box open, right-click an existing instance from the Product Library tree view and choose Properties to open the Instance Properties dialog box.
3. Click the plus sign (+) next to Spatial Reference.
4. Click the cell next to Use Existing.
5. Click the drop-down arrow that appears and choose False.
6. Click the cell next to Base Spatial Reference and click the ellipsis (...) that appears.

   The Spatial Reference Properties dialog box appears.

7. Click Select.

   The Browse for Coordinate System dialog box appears.

8. Navigate to the coordinate system you want to use for your area of interest.
9. Click Add.

   The Spatial Reference Properties dialog box appears.

10. Click OK.

    The New Instance or Instance Properties dialog box appears.

11. Click OK to close the dialog box.