Datum Tegak Amerika Utara 1988

Datum Tegak Amerika Utara 1988 (NAVD 88) is the vertical control datum established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.

The NAVD 88 was established in 1991 by the minimum-constraint adjustment of geodetic leveling observations in Canada, the United States, and Mexico. It held fixed the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 local mean sea level height value, at Rimouski, Quebec, Canada. Additional tidal bench mark elevations were not used due to the demonstrated variations in sea surface topography, i.e., the fact that mean sea level is not the same equipotential surface at all tidal bench marks.

NAVD 88 menggantikan Datum Tegak Geodesi Negara 1929 (NGVD 29) yang dahulunya dikenali sebagai Datum Aras Laut 1929.

Lihat juga

• Altitud
• Datum Tegak Geodesi Negara 1929
• Datum Aras Laut 1929
• Geodesi
• Ketinggian topografi
• Topografi

Pautan luar

• United States Geological Survey website
• U.S. National Geodetic Survey website
  • Geodetic Glossary @ NGS
  • NGVD 29 to NAVD 88 online elevation converter @ NGS