NGVD29 was superseded by the North American Vertical Datum of 1988 (NAVD 88), based upon an equipotential definition and a readjustment, although many cities and Corps of Engineer projects with established data continued to use the older datum.

Vertical Datum: Mean Sea Level.

VERTCON is a computer program that computes the modeled difference in orthometric height between the North American Vertical Datum of 1988 (NAVD 88) and the National Geodetic Vertical Datum of 1929 (NGVD 29) for a location in the contiguous United States.

All elevations in this article include an elevation adjustment from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88).

Vertical Datum Transformation tool (Vdatum)

The point, which is tectonically stable, is called the North American Vertical Datum of 1988.

North American Vertical Datum of 1988 (NAVD 88)

Hurricane Rita made landfall on September 24, 2005 and on September 12-13, 2008, Hurricane Ike struck Sabine Pass and Galveston, generating the highest surge of 22 feet which is, according to the North American Vertical Datum of 1988 (NAVD 88), the highest ever recorded at Sabine Pass.