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    • NGVD 29 = NAVD 88 –3.6 feet

      • 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.
      pubs.usgs.gov › sir › 2010

      Conversion Factors and Datums - USGS Publications Warehouse

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

    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 in desired reference levels.

    • Datum Tutorial

      A vertical datum is a reference system used for specifying...

    • Vertical Datum

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

  4. www.fema.gov › sites › defaultGuidance for Flood Risk Analysis and Mapping - FEMA.gov

    1-percent-annual-chance flood elevation information in Flood Insurance Rate Map (FIRM) databases, on FIRMs, and in Flood Insurance Studies (FISs). Information on publicly available software for converting from NGVD 29 to NAVD 88.

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    • North American Vertical Datum of 1988 (NAVD 88) | Mass.gov
    • Vertical Datum - Earth's Elevation Reference Frame - GIS Geography
    • SRWMD Using a Newer Vertical Datum | Suwannee River Water Management ...
    • Getting the height right: The North American Vertical Datum of 1988 ...

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

    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.

  7. pubs.usgs.gov › sir › 2010Conversion Factors and Datums - USGS Publications Warehouse

    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.

  8. www.fema.gov › sites › defaultGuidance for Flood Risk Analysis and Mapping - FEMA.gov

    This document contains the fol lowing information about conversion from the NGVD29 to NAVD88: • General information about the two vertical datums most commonly used by FEMA for referencing 1% annual chance flood elevation information in Flood Insurance Rate Map

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