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5,761 ft
- 5,761 ft (1,756 m)
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What is NAVD 88?
How do I change a coordinate from NGVD 29 to NAVD 88?
What is the difference between NGVD 29 and NAVD 88?
Geodesy. 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 of America based upon the General Adjustment of the North American Datum of 1988. [1]
Nov 4, 2020 · The NAVD 88 used some of the original data from 1929 but also re-leveled about 100,000 km. Originally scheduled to be completed in 1988, it was finished on June 15, 1991. The new datum produced fewer distortions than earlier vertical datums and more accurate elevations, according to Remondi.
Montana City: Jefferson: 4199-111.932: 46.538: Montaqua: Carbon: 3560-108.901: 45.509: Moore: Fergus: 4136-109.696: 46.976: Moorhead: Powder River: 3326-105.871: 45.065: Morgan: Phillips: 2826-107.832: 48.993: Mosby: Garfield: 2512-107.883: 46.992: Musselshell: Musselshell: 3036-108.091: 46.519: Myers: Treasure: 2637-107.340: 46.251: Nashua ...
Oct 12, 2010 · The first geodetic leveling project in the United States was surveyed by the Coast Survey from 1856 to 1857. General adjustments of leveling data yielded datums in 1900, 1903, 1907, and 1912. NGS does not offer products which transform from these older datums into newer ones (though some users still work in them!)
NAVD 88, was completed in June 1991. It is now the only official vertical datum in the United States. NAVD 88 was created by adding 625,000 kilometers of leveling, performed after NGVD 29 was established, and by performing a major least squares adjustment that constrained only a single tide station at zero elevation.
v. t. e. The North American Datum ( NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, cartography, and land-use planning, two North American Datums are in use for making lateral or ...
Per Standard 118, all new flood maps must be referenced to NAVD88. If the Flood Risk Project is updating an existing FIRM that is referenced to NGVD29, any unrevised flood elevations within the project footprint will need to be converted to NAVD88. Additionally, to eliminate possible confusion and misuse of flood elevation information, all ...
