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2. www.vdatum.noaa.gov › vdatumwebOnline VDatum: Vertical Datums Transformation

   www.vdatum.noaa.gov › vdatumweb

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   Datum Ellipsoidal Datum Orthometric Datum Tidal Datum. Web VDatum is designed to vertically transform geospatial data among a variety of tidal, orthometric and ellipsoidal vertical datums - allowing users to convert their data from different horizontal/vertical references into a common system and enabling the fusion of diverse geospatial data ...

   • Vertcon 3.0

     VERTCON 3.0 was a project whose intent was to create new...

   • Vertical Datum

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

   • Datum Tutorial

     When dealing with paper maps and charts, the datums are...

3. www.broward.org › ConversionInstructionsConversion Instructions - Welcome to Broward County

   www.broward.org › ConversionInstructions

   In the first example, the countywide conversion factor is -0.609. The elevation in NAVD 88 would be: 54.2 + -0.609 = 53.591 or 53.6 ft. Remember, if you add a negative number to the existing elevation, the resulting elevation will be a lower number. In the second example, the conversion factor for Arroyo Seco is 2.99.

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4. People also ask

   How do you calculate elevation in NAVD 88?

   • To calculate the elevation in NAVD 88, add the conversion factor to the existing elevation. For example, assume the existing elevation in NGVD 29 is 54.25 ft. for the top of bottom floor.

   Converting Existing Elevations When the Flood Map Vertical Datum

   www.broward.org/Environment/FloodZoneMaps/Documents/ConversionInstructions.pdf

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   How do I convert NGVD 29 elevation to NAVD 88?

   • Elevations referenced to NGVD 29 can be converted to NAVD 88 by using a conversion factor. This conversion factor is just added to the NGVD 29 elevation to compute the equivalent NAVD 88 elevation. The simplest method is to use the offset used by FEMA.

   Converting Existing Elevations When the Flood Map Vertical Datum

   www.broward.org/Environment/FloodZoneMaps/Documents/ConversionInstructions.pdf

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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)

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

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   Is NAVD 88 lower than NGVD 29?

   • NAVD 88 is lower than NGVD 29 in the east, so the conversion factor will be a negative number. The elevation converted to NAVD 88 will be a lower number than the elevation in NGVD 29. In the western United States, individual streams or watersheds have their own conversion factors.

   Converting Existing Elevations When the Flood Map Vertical Datum

   www.broward.org/Environment/FloodZoneMaps/Documents/ConversionInstructions.pdf

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5. 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 · In a few years the key datum of the last 30 years, the North American Vertical Datum of 1988 — the datum used by federal agencies such as the Federal Emergency Management Agency and the U.S. Army Corps of Engineers — will be replaced by a new, satellite-based system. David B. Zilkoski, the former director of the National Geodetic Survey at ...

6. vdatum.noaa.govNOAA/NOS's VDatum 4.6.1: Vertical Datums Transformation

   vdatum.noaa.gov

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   NOAA VDatum APIs: Full API. VDatum is designed to vertically transform geospatial data among a variety of tidal, orthometric and ellipsoidal vertical datums - allowing users to convert their data from different horizontal/vertical references into a common system and enabling the fusion of diverse geospatial data in desired reference levels.