North American Vertical Datum of 1988
The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum of orthometric height established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988. The definition of NAVD 88 uses the Helmert orthometric height, which calculates the location of the geoid (which approximates sea level) from modeled local gravity. The NAVD 88 model is based on then-available measurements, and remains fixed despite later improved geoid models.
primaryTopic
North American Vertical Datum of 1988
The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum of orthometric height established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988. The definition of NAVD 88 uses the Helmert orthometric height, which calculates the location of the geoid (which approximates sea level) from modeled local gravity. The NAVD 88 model is based on then-available measurements, and remains fixed despite later improved geoid models.
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The North American Vertical Da ...... ry does change between datums.
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The North American Vertical Da ...... e later improved geoid models.
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North American Vertical Datum of 1988
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