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Jul 12, 2018 · The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established in 1991 by the minimum-constraint adjustment of the Canadian-Mexican-United States leveling observations.
- TY5255
- Quebec, Canada
- Pointe-au-Pere, Rimouski
- 54L071
The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.
Conversion between NAVD 88 and the commonly used NGVD 29 varies spatially; however, over most of the study area the following conversion can be used: NGVD 29 = NAVD 88 –3.6 feet. This conversion generally is accurate within about ± 0.5 feet for 95 percent of the study area.
Jun 20, 2024 · The North American Vertical Datum of 1988 (NAVD88) is currently the official geodetic vertical datum for the United States. A NAVD88 elevation is an orthometric height, which means a height above the geoid (an equipotential gravitational reference surface that approximates an idealized global sea surface).
Have you ever noticed the abbreviation NAVD 88 or NGVD 29 written after an elevation marker on a survey or construction drawing and wondered what it means? What’s the difference between the two? Or maybe you’ve wondered why we don’t always use Above Ground Level (AGL).
Nov 4, 2020 · The NAVD 88 used some of the original data from 1929 but also re-leveled about 100,000 km. Originally scheduled to be completed in 1988, it was finished on June 15, 1991. The new datum produced fewer distortions than earlier vertical datums and more accurate elevations, according to Remondi.
People also ask
What does NAVD 88 stand for?
Why is NAVD 88 more accurate than NVD 29?
Is NAVD 88 biased or tilted?
Why was NAVD 88 computed?
Jul 12, 2018 · What is the relationship between the geodetic vertical datums (NGVD 29 and/or NAVD 88) and the various water level/tidal datums? NGS develops and maintains the current national geodetic vertical datum, NAVD 88.
