Geoid Height and Deflections of the Vertical Models - National Geospatial Data Asset (NGDA) Geoid Models

Description

In Gauss' words, the geoid is "the mathematical figure of the Earth". This figure is an equipotential surface coincident with the idealized mean sea surface. The geoid can be computed from the geodetic boundary value problems that use gravity data as its boundary value. A geoid model computed using gravity data is called gravimetric geoid. On the other hand, geoid height at bench marks can also be computed using data of the spirit leveling and the Global Positioning System (GPS). A geoid model that fixed to the GPS/leveling data is called hybrid geoid. Both geoid models can serve as the zero-height-surface of a country's height system by selection. To satisfy this need, National Geodetic Survey has published a series of geoid models (http://geodesy.noaa.gov/GEOID). The latest models are USGG2012 and GEOID12B, both are at 1 arc-second grids over the territory of the United States.

Resources

Name Format Description Link
0 Applications http://www.ngs.noaa.gov/GEOID///
0 Online Resource http://www.ngs.noaa.gov/GEOID//
0 Global Change Master Directory (GCMD). 2024. GCMD Keywords, Version 19. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords
33 NOAA Data Management Plan for this record on InPort. https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ngs/dmp/pdf/39739.pdf
0 View the complete metadata record on InPort for more information about this dataset. https://www.fisheries.noaa.gov/inport/item/39739

Tags

  • usgg2012
  • national geodetic survey
  • alaska
  • virgin islands
  • geoid03
  • terrain elevation
  • national ocean service
  • gravity fields
  • national geospatial data asset
  • ngs
  • doc/noaa/nos/ngs
  • topographic data
  • american samoa
  • united states
  • noaa
  • guam
  • elevation
  • hawaii
  • interior and crust
  • geodesy
  • mexico
  • geodetic/global positioning
  • geodetic control theme
  • egm2008
  • u.s. department of commerce
  • ngda
  • geoid12a
  • commonwealth of the northern mariana islands
  • land
  • deflec12a
  • puerto rico
  • caribbean

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