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  1. 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.

    • Vertcon 3.0

      The grids in VERTCON 3.0 release 20190601 are replacements...

    • FAQs

      What are NGVD 29 and NAVD 88? Why did NGS change from NGVD...

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  3. 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.

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  5. www.ngs.noaa.gov › VERTCON3VERTCON 3.0 | Tools | National Geodetic Survey

    • T Is Vertcon 3.0?
    • Do I Use Vertcon 3.0?
    • Can I Learn More About Vertcon 3.0?

    VERTCON 3.0 was a project whose intent was to create new “build software”, and use that software to build and release transformation grids capable of performing orthometric height transformations for a range of datums and regions in the National Spatial Reference System. Those new grids (and supporting information) are called VERTCON 3.0 release 20...

    See full list on ngs.noaa.gov

    VERTCON 3.0 release 20190601 is functionally implemented in NGS’s Coordinate Conversion and Transformation Tool (NCAT). Unlike earlier versions of VERTCON, VERTCON 3.0 release 20190601is not a stand-alone tool. Visit the VERTCON 3.0 Digital Archive to access raw transformation data that make up VERTCON 3.0 release 20190601(e.g., grids, images, soft...

    See full list on ngs.noaa.gov

    NOAA Technical Report NOS NGS 68 (PDF, 8 MB)provides detailed information on VERTCON 3.0, and the digital archive includes plots and data.

    See full list on ngs.noaa.gov

  6. emilms.fema.gov › is_1103a › groupsNGVD 1929 Conversion to NAVD 1988 - FEMA

    NAVD 1988 is the newer elevation datum. An easy way to convert BFE data is through the National Geodetic Survey (NGS) online tool known as VERTCON. Select this link to view and use the VERTCON site. You can also contact the appropriate floodplain administrator for guidance.

  7. www.broward.org › ConversionInstructionsConverting Existing Elevations When the Flood Map Vertical ...

    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.

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  8. www.ngs.noaa.gov › datums › faqFrequently Asked Questions: Datums | Datums | National ...

    Jul 12, 2018 · What are NGVD 29 and NAVD 88? Why did NGS change from NGVD 29 to NAVD 88 ? What is the relationship between the geodetic vertical datums (NGVD 29 and/or NAVD 88) and the various water level/tidal datums?

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

    This guidance document supports the nine vertical datum standards adopted by FEMA for vertical datum conversions from the National Geodetic Vertical Datum of 1929 (NGVD 29) to the North American Vertical Datum of 1988 (NAVD 88).

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