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NGVD29 was superseded by the North American Vertical Datum of 1988 , [3] based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985 local mean sea level height value), although many cities and U.S. Army Corps of Engineers "legacy" projects with established data continued to use the older datum.
This simple template will aid editors to document that the National Geodetic Vertical Datum of 1929 is being used. Note that Wikipedia encourages the use of NAVD 88 and conversions between the two datum can be done using a tool provided by the National Geodetic Survey. The tool is named VERTCON and can be found here. If an elevation is ...
VERTCON is a computer program that computes the modeled difference in orthometric height between the North American Vertical Datum of 1988 (NAVD 88) and the National Geodetic Vertical Datum of 1929 (NGVD 29) for a location in the contiguous United States. [1] The parameters required are the latitude and longitude of the location.
This template creates a bottom note which explains that VERTCON, an online orthometric height conversion tool, was used to calculate the NAVD 88 elevation from the NGVD 29 elevation. Ref tags are generated by the template and so must not be added by the editor.
The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States based upon the General Adjustment of the North American Datum of 1988. [1] It superseded the National Geodetic Vertical Datum of 1929 (NGVD 29), [2] previously known as the Sea Level ...
Vertical measurements, based on distances above or below Mean High Water (MHW), are calculated using the North American Vertical Datum of 1988 (NAVD 88). [1] NAD 83, along with NAVD 88, is set to be replaced with a new GPS- and gravimetric geoid model-based geometric reference frame and geopotential datum, potentially in 2025. [2]
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This template creates a bottom note which explains that VERTCON, an online orthometric height conversion tool, was used to calculate the NAVD 88 elevation from the NGVD 29 elevation. Ref tags are generated by the template and so must not be added by the editor.