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noaa.gov
Vertical Datum Transformation
Integrating America's Elevation Data
 * Home
   
 * About VDatum
   * Revision Log
   
 * Download
   
 * Online
   
 * Docs & Support
   * Est. of VDatum Uncertainties
   * User FAQs
   * User Guide
   * Command-line Guide
   * API Guide
   * Datum Tutorial
   * Presentations & Publications
   * Interpolation and Transformation Grid Format
   
 * Contact Us

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WELCOME TO VDATUM!

VDatum is a free software tool being developed jointly by NOAA's National
Geodetic Survey (NGS), Office of Coast Survey (OCS), and Center for Operational
Oceanographic Products and Services (CO-OPS). 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.

Important:

 * Understanding how Chesapeake/Delaware Bay Transformation Roadmap differs from
   the normal roadmap
   
   
 * Understanding how SE AK Transformation Roadmap differs from the normal
   Roadmap.
   
   
 * Gulf of Maine (identified issue): a transformation error in ME grids for
   VDatum in the vicinity of Bath ME has been identified. Users should
   understand there is higher uncertainty (greater than 50 cm) than reported
   when transforming to tidal datums in the vicinity.
   
   
 * Transformation Uncertainties in the ‘Louisiana/Mississippi - Eastern
   Louisiana to Mississippi Sound’ Regional Model, have been found to range from
   20 to 50 cm in particular locations from the Mississippi River Delta north to
   Lake Pontchartrain. These issues most likely can be attributed to subsidence,
   newly established datums, and changes to the understanding of NAVD88 based on
   new versions of the GEOID. The VDatum Team is currently looking at resolving
   these uncertainties.

Download v4.3

Download the latest VDatum (v4.3) and its datasets.

Revision Log

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FEATURES

VDatum software is written in Java, so it runs on Mac OS X, Unix, VMP, and
Windows. (*Check your local JDK or JRE version before you run VDatum app. In
NOAA VDatum package, the OpenJDK-11.0.2_Windows-x64 is bundled) About Java Home

Where available and uncertainties are established, VDatum supports the
conversions among following: 

 * Coordinate Systems:  Geographic, UTM, State Plane Coordinates (SPC), and
   geocentric (ECEF)

 * Horizontal Datums:  NAD27, NAD83_2011, NAD83_1986, NAD83_FBN, and NAD83_HARN;
   and ellipsoidal datums such as of ITRF, WGS84, and NAD83 serializations

 * Vertical Datums: 
   
   * Ellipsoidal Datums: NAD83_2011, WGS84, ITRF88, ITRF89, ITRF90, NEOS 90,
     PNEOS 90, ITRF91, ITRF92, SIO/MIT 92, ITRF93, ITRF94, ITRF96, ITRF97,
     IGS97, ITRF2000, IGS00, IGb00, ITRF2005, IGS05, ITRF2008, IGS08, ITRF2014,
     IGS14, WGS84(transit), WGS84(G730), WGS84(G873), WGS84(G1150),
     WGS84(G1674), NAD83(PACP00), NAD83(MARP00)
   
   * Orthometric Datums:   NAVD88, NGVD29, PRVD02, VIVD09, ASVD02, GUVD04,
     NMVD03, HAWAII EGM2008, EGM1996, and EGM1984
   
   * Tidal Datums: MLLW, MLW, LMSL, DTL, MTL, MHW, LWD, MHHW and Local Tidal(LT)
   
   * IGLD85, LWD IGLD 1985, OHWM IGLD 1985
   
   

 * GEOID models: GEOID18, GEOID12B, GEOID12A, GEOID09, GEOID06 (Alaska only),
   GEOID03, GEOID99, and GEOID96

 * EGM models: EGM2008, EGM1996, and EGM1984

 * xGEOID models: xGEOID16b (BETA), xGEOID17b (BETA), xGEOID18b (BETA),
   xGEOID19b(BETA), and xGEOID20b(BETA)

 * Supported file format: text(ASCII), LiDAR(.LAS, *.LAZ) version 1.0, 1.1, 1.2
   and 1.4 with Classification, ESRI ASCII Raster(.ASC), ESRI 3D shapefile,
   GeoTIFF (on Windows OS), and ERDAS IMAGINE (on Windows OS)

 * NOAA VDatum APIs:  Tidal API, Full API (Beta)


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