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The effect of modernizing the national datums on floodplain mapping : a cooperative pilot project between the National Geodetic Survey, North Carolina Floodplain Mapping Program, North Carolina Geodetic Survey, and the Federal Emergency Management Agency
  • Published Date:
    2011
Filetype[PDF - 3.60 MB]


Details:
  • Corporate Authors:
    National Geodetic Survey (U.S.) ; North Carolina Floodplain Mapping Program ; North Carolina, Division of Geodetic Survey, ; ... More ▼
  • Description:
    "This study was conducted to examine the effects on floodplain mapping of replacing the national datums of the United States. By approximately 2022, NOAA's National Geodetic Survey (NGS) will modernize (replace) the official datums, currently the North American Datum of 1983 (NAD 83) and the North American Vertical Datum of 1988 (NAVD 88). Based on new technologies and methods, NGS will define new geometric and geopotential datums that will replace NAD 83 and NAVD 88, respectively. Georeferencing spatial data to the correct datum is extremely important to many geospatial applications, including construction, agriculture, resource management, navigation, and emergency management. These updates will provide a critical improvement to orthometric heights, which are offset up to 2 meters (over 6 feet). In addition to the new datums, NGS is also considering promoting appropriate use of the passive control network by publishing estimated orthometric height accuracies for bench marks. In order to investigate the effects of this coming change, a pilot study was conducted in cooperation with the North Carolina Floodplain Mapping Program (NCFMP) and the North Carolina Geodetic Survey (NCGS). This report reflects the outcome of that pilot study"--executive summary.

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