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The elevation of the highest predicted astronomical tide expected to occur at a specific tide station over the time period of 40 years. The 40 years period will include 2 National Tidal Datum Epoch periods.
- Station Selection
Website Owner: Center for Operational Oceanographic Products...
- Navd88
Other tidal (Mean High Water(MHW)) and geodetic (North...
- Station Selection
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.
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Jul 12, 2018 · The North American Datum of 1983 (NAD 83) is the horizontal control datum for the United States, Canada, Mexico, and Central America, based on a geocentric origin and the Geodetic Reference System 1980. This datum, NAD 83, is the current geodetic reference system.
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.
Preliminary analyses indicate differences for the conterminous United States between orthometric heights referred to NAVD 88 and to the National Geodetic Vertical Datum of 1929 (NGVD 29) range from -40 cm to +150 cm. In Alaska, the differences range from +94 cm to +240 cm.
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).
NAVD 88 supersedes the National Geodetic Vertical Datum of 1929 (NGVD 29) which was the former official height reference (vertical datum) for the United States. NAVD 88 provides a modem, improved vertical datum for the United States, Canada, and Mexico.
