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Disclaimer
Although many of the vertical datum transformations between the North America Vertical Datum of 1988 (NAVD 88) and mean sea level, and between mean sea level and the other tidal datums, are based on tidal values from the present National Tidal Datum Epoch (NTDE, 1983 to 2001), some are based on data from older tidal epochs. NOAA / NOS is in the process of updating the data in VDatum to conform to the latest NTDE. In the mean time, care should be used when applying these transformations.
Users of VDatum should be aware of the potential uncertainties, or errors, in computed heights when applying the software to convert values between vertical datums. Random errors in VDatum may arise from inaccuracies in either the gridded fields employed in the datum transformations, such as GEOID03 or the Mean Sea Level (MSL)-to-Mean Higher High Water (MHHW) transformation, or in the source observational data used to create VDatum, such as the elevation of the tidal datums or the height of the North American Vertical Datum of 1988 (NAVD 88). The user should also be aware of the existence of measurement errors in his or her own vertical elevation data, i.e. uncertainties related to bathymetric measurement, GPS measurement, leveling, etc.
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Java Runtime Environment (JRE)
Running VDatum requires that Java Runtime Environment (JRE) 1.4.2 or newer version be installed on the user's computer. When you click on a link below, you will leave our site and go to a non-government website. We does not endorse these sites, but these links are provided so you may obtain the free software needed to run VDatum software.
Click on this link to see if your computer has the required JRE:
http://java.com/en/download/help/testvm.xml
Otherwise, click on this link to get free Java software:
http://java.com/java/download/index.jsp?cid=jdp121116
VDatum Installation
Since VDatum version 2.x, all transformation grids are in binary format. If your computer has already had the old VDatum, download the new software and transformation grids from the links in this page to use instead.
- New to VDatum or upgrade to VDatum 2.x?
- Have the newest VDatum software and only want to download new VDatum project areas?
- To browse VDatum download directory:
Software and source code directory at: download/software
Typography convention
- Navigation links : describes navigation links to other pages.
- Download links : describes download links. Right click on the link and choose "Save Link As ..." to download compressed VDatum software/data packages. Most of download files are in zip format (.ZIP), these files can be extracted by using file compression program such as 7-zip (free, open source software) or WinZip.
- Hidden picture
: move the cursor over the link to see the hidden picture.
