To Change the Vertical Datum of a GCS
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In the Geographic Coordinate System dialog, select the From Library icon.
The Select Geographic Coordinate System dialog opens.
- On the Library tab, expand the folders as needed to locate a GCS that uses a datum of NAD27, NAD83, HPGN, or their equivalent.
- Click OK.
- In the Geographic Coordinate System dialog, click Details. The Geographic Coordinate System Properties dialog opens.
- On the Coordinate System Modifiers section, in the Vertical Datum drop-down list, change the vertical datum to National Geodetic Vertical Datum of 1929 or North American Vertical Datum of 1988.
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Click OK.
If Reproject Elevation to "Yes" in the Reprojection Settings dialog, the Geographic Coordinate Systems Changed dialog opens.
- Select the appropriate option for your data, to either reproject or not reproject the data.