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  1. Definitions - Mandle-Edwards Surveying

    mandle-edwards.com/as/Definitions.html

    NAVD 88. The North American Vertical Datum of 1988 (NAVD 88) is the vertical control datum established in 1991 by the minimum-constraint adjustment of the Canadian-Mexican-U.S. leveling observations.

  2. National Geodetic Vertical Datum of 1929 - Wikipedia

    en.wikipedia.org/wiki/Sea_Level_Datum_of_1929

    NGVD29 was superseded by the North American Vertical Datum of 1988 (), based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985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 projects with established data continued to use the older datum.

  3. USGS Open-File Report 2005-1027, An Operational Mean High ...

    pubs.usgs.gov/of/2005/1027/html/calcu.html

    Determining Operational MHW Elevations; Calculating Operational MHW, MHHW, and MTL. The lidar-derived shoreline is defined as a specific elevation relative to NAVD 88 (Stockdon, 2002). Therefore, the tidal datum elevations tabulated here also need to be referenced to NAVD 88.

  4. Understanding Vertical Datums - FEMA Region II Coastal ...

    sites.google.com/site/region2coastal/sandy/abfe/...

    The elevations shown on the ABFE maps, preliminary work maps and preliminary FIRMs released by FEMA are referenced to the North American Vertical Datum of 1988 (NAVD88).

  5. elevation - Convert NGVD 1929 to NAVD 1988? - Geographic ...

    gis.stackexchange.com/questions/250174/convert...

    My root issue is that I have elevation values in NGVD 1929 that need to be related to a DEM which has elevation values in NAVD 1988. Is there a way that I can convert elevation from one data to a...

  6. USGS Current Conditions for USGS 04235396 OWASCO LAKE NEAR ...

    waterdata.usgs.gov/ny/nwis/uv?site_no=04235396

    To convert elevations to NAVD of 1988, subtract 0.49 ft. Prior to May 1, 1982, nonrecording gage read once daily by employees of City of Auburn Water Division at same site and datum. COOPERATION.-- Elevation record provided by City of Auburn until April 30, 1982.

  7. Frequently Asked Questions

    www.mvn.usace.army.mil/Missions/Engineering/...

    The difference between zero elevation on the North American Datum of 1988 (NAVD88) and zero ellipsoid height for South Louisiana is about twenty seven meters = 88.5 feet. Handheld GPS receivers (consumer grade), receive single frequency Coarse Acquisition code (CA code), where with Selective Availability turned off, has a nominal positional ...

  8. Can someone explain to me Base Flood Elevation ...

    www.tigerdroppings.com/rant/o-t-lounge/can...

    All elevations are taken from the same datum (NAVD88). If your property is at elev. 4' and the BFE is at 8', then your property is currently 4' below base flood. Back to top

  9. What is my elevation?

    whatismyelevation.com

    This site was designed to help you find the elevation of your current location, or any point on Earth. When viewed from a phone that supports elevation readings, the reading will come directly from your device altitude reading and will update automatically as you move.

  10. What Is My BFE? Address Lookup Tool | FEMA Region II

    www.region2coastal.com/view-flood-maps-data/what-is-my...

    Oct 04, 2019 · Elevate your home’s lowest floor above the updated flood elevation provided by FEMA or the Base Flood Elevation (BFE) shown on your community’s effective FIRM, whichever is higher. This is a good way to reduce your flood risk and it can also reduce future flood insurance premiums.