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

   www.usgs.gov › about › organization

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   This document provides guidance to U.S. Geological Survey (USGS) authors on using and documenting geodetic datums for horizontal (location) and vertical (elevation) coordinates in USGS publication series information products (refer to Survey Manual (SM) chapter SM 1100.3).

2. www.nrc.gov › docs › ML1422TN1333 - National Geodetic Survey - Vertical Datums. - NRC

   www.nrc.gov › docs › ML1422

   A vertical datum is a surface of zero elevation to which heights of various points are referred in order that those heights be in a consistent system. More broadly, a vertical datum is the entire system of the zero elevation surface and methods of determining heights relative to that surface. Over the years, many

3. 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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4. www.ngs.noaa.gov › web › science_eduRedefinition of the U.S. Vertical Datum: Replacing NAVD 88

   www.ngs.noaa.gov › web › science_edu

   Oct 12, 2010 · Definition: The surface of equal gravity potential to which orthometric heights shall refer in North America*, and which is 6.271 meters (along the plumb line) below the geodetic mark at “Father Point/Rimouski” (NGSIDB PID TY5255).

5. dot.ca.gov › ls-manual › 04-surveys-a11y4 Survey Datums - Caltrans

   dot.ca.gov › ls-manual › 04-surveys-a11y

   “NAVD 88”, but this includes any elevations that conform to the provisions for COH88 elevations as described in P.R.C. Sections 8890-8902. 2 different meanings. According to NGS, a geodetic datum is “A set of constants specifying the coordinate system used for geodetic control…”

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6. sensibleshorelines.org › wp-content › uploadsUnderstanding Mean Sea Level, NGVD, NAVD - Sensible Shorelines

   sensibleshorelines.org › wp-content › uploads

   Understanding Mean Sea Level, NGVD, NAVD. These are all the ways of accurately locating a point on the earth with, in the case of the vertical datum, relation to sea level. NAD 83 is a horizontal datum, so is not of particular interest to us.

7. People also ask

   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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   How do I find NAVD 88 elevation?

   • The NAVD 88 datum should be read as “The NAVD 88 elevation of “0.000” is equivalent to 0.335 meters below the MLLW datum at this station.” Or “Adding 0.335 meters to each tidal datum will give you the tidal datum information elevation in NAVD 88 elevations.”

   4 Survey Datums - Caltrans

   dot.ca.gov/-/media/dot-media/programs/right-of-way/documents/ls-manual/04-surveys-a11y.pdf

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   When did NAVD 88 become a vertical datum?

   • In 1993, NAVD 88 was affirmed as the official vertical datum in the NSRS for the Conterminous United States and Alaska (refer to the Federal Register Notice referenced below). For vertical datums applicable to U.S. territories, refer to the NGS vertical datums web page.

   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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   What is the national geodetic datum (NGVD)?

   • North American Vertical Datum of 1988. The official datum for orthometric heights in the United States. National Geodetic Survey. National Geodetic Vertical Datum of 1929. NGVD 29 was the official datum for orthometric heights in the U.S. until superseded by NAVD 88. It is no longer supported by NGS. National Ocean Service.

   4 Survey Datums - Caltrans

   dot.ca.gov/-/media/dot-media/programs/right-of-way/documents/ls-manual/04-surveys-a11y.pdf

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8. gisgeography.com › vertical-datumEarth’s Elevation Reference Frame - GIS Geography

   gisgeography.com › vertical-datum

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   These datums are used to measure the height (altitude) and depth (depression) above and below mean sea level. Commonly used vertical datums in North America are the National Geodetic Vertical Datum of 1929 (NGVD29) and the North American Vertical Datum of 1988 (NAVD88). A (vertical) geodetic datum often ties in tidal datums.