NAVD 88 is the abbreviation for the North American Vertical Datum of 1988. NAVD 88 is one of five current National Geodetic Datums, which are coordinate systems that act as standard reference lines to measure points on the earth’s surface in the region that they apply.
provides elevations on station datum in table and chart. Station: 8638660, PORTSMOUTH, NORFOLK NAVAL SHIPYARD, VA Status: Accepted (Apr 29 2003) Units: Feet ...
Lake or reservoir water surface elevation above NGVD 1929, ft (3 sites) Estuary or ocean water surface elevation above NAVD 1988, ft (27 sites) Depth to water level, ft below land surface (327 sites) Elevation above NGVD 1929, ft (1 sites) Streamflow, tidally filtered, ft³/s (3 sites) Water Quality Parameters
The elevation in NAVD 88 would be: 54.2 + -0.609 = 53.591 or 53.6 ft. Remember, if you add a negative number to the existing elevation, the resulting elevation will be a lower number. In the second example, the conversion factor for Arroyo Seco is 2.99. So for a structure affected by flooding from Arroyo Seco, the elevation in NAVD 88 would be:
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The product refers to an altitude or an elevation (orthometric height). State the vertical datum name and year in that document. Example: "Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88)."
Jul 26, 2013 · One can readily convert elevations in one datum to those based on another. For example, zero in the Chicago City Datum is 579.48 feet above zero (“mean sea level”) in NGVD 29. If one tries to compare a ground elevation in CCD to a flood elevation in NGVD 29, the 579 foot difference will make it readily apparent that something is off.
Dec 01, 2019 · The current standards is that all Flood Elevations are based on NAVD88, which is the North American Vertical Datum of 1988. Planning and Building in the Flood Zone The BFE and DFE must be figured out before beginning even a preliminary design for a property in the Flood Zone.
The term elevation is used when the base gage-height has been determined from less accurate means, such as maps, barometer, etc. The datum or elevation will be reported to either NGVD of 1929 or NAVD of 1988, or to a different datum which is noted in the description of the gage.
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