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   When was NAVD 88 renamed?

   • Therefore, it was renamed in 1973, the National Geodetic Vertical Datum on 1929. ( Geodetic Glossary, pp. 56) 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.

   Frequently Asked Questions: Datums | Datums | National Geodetic Survey

   www.ngs.noaa.gov/datums/faq.shtml

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   What is NAVD 88 & NGVD 29?

   • The North American Vertical Datum of 1988 (NAVD 88) is the official vertical datum of the United States, having superseded the older National Geodetic Vertical Datum of 1929 (NGVD 29). Both NAVD 88 and NGVD 29 are geodetic datums, a reference surface of zero elevation to which heights are referred to over a large geographic extent.

   North American Vertical Datum of 1988 (NAVD 88) | Mass.gov

   www.mass.gov/info-details/north-american-vertical-datum-of-1988-navd-88

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   What is NAVD 88?

   • In 1993 NAVD 88 was affirmed as the official vertical datum in the National Spatial Reference System (NSRS) for the Conterminous United States and Alaska (see Federal Register Notice (FRN)). Although many papers on NAVD 88 exist, no single document serves as the official defining document for that datum.

   North American Vertical Datum of 1988 (NAVD 88) - Vertical Datum

   www.ngs.noaa.gov/datums/vertical/north-american-vertical-datum-1988.shtml

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   Does NAVD 88 mean sea level?

   • If the specific vertical datum is NAVD 88, areas outside North America can reference the sea level vertical datum or another local vertical datum. If the specific vertical datum is NGVD 29, areas outside the conterminous United States and Alaska can reference the sea level vertical datum. Can the term "mean sea level" be used?

   Guidance on Use and Documentation of Horizontal and Vertical Datum…

   www.usgs.gov/about/organization/science-support/office-science-quality-and-integrity/guidance-use-and

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2. www.ngs.noaa.gov › datums › verticalNorth American Vertical Datum of 1988 (NAVD 88) - Vertical ...

   www.ngs.noaa.gov › datums › vertical

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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.

   • FAQs

     The North American Vertical Datum of 1988 (NAVD 88) is the...

   • Background

     NAVD 88 is both biased (by about one-half meter) and tilted...

3. en.wikipedia.org › wiki › North_American_VerticalNorth American Vertical Datum of 1988 - Wikipedia

   en.wikipedia.org › wiki › North_American_Vertical

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   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.

4. www.asce.org › publications-and-news › civilGetting the height right: The North American Vertical Datum ...

   www.asce.org › publications-and-news › civil

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   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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6. www.usgs.gov › about › organizationGuidance on Use and Documentation of Horizontal and Vertical ...

   www.usgs.gov › about › organization

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   The NAD 83 and the NAVD 88 are the recommended datums to use in USGS publication series information products. The use of these datums establishes a common reference for all horizontal and vertical data in the NSRS for the conterminous United States and Alaska.

7. www.mass.gov › info-details › north-americanNorth American Vertical Datum of 1988 (NAVD 88) | Mass.gov

   www.mass.gov › info-details › north-american

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   The North American Vertical Datum of 1988 (NAVD 88) is the official vertical datum of the United States, having superseded the older National Geodetic Vertical Datum of 1929 (NGVD 29). Both NAVD 88 and NGVD 29 are geodetic datums, a reference surface of zero elevation to which heights are referred to over a large geographic extent.