U.S. North-South Deflections (DEFLEC96)

Description

This 2' surface deflection of the vertical grid for the conterminous United States is the DEFLEC96 model. The computationused about 1.8 million terrestrial and marine gravity data held in the National Geodetic Survey gravity data base in July 1996. These data were augmented by gravity data contributions from NGA (former National Imagery and Mapping Agency (former Defence Mapping Agency)). The deflections were obtained by numerical differentiation of cubic spline models along the meridians of the GEOID96 grid. The gravity values are based on theInternational Gravity Standardization Net 1971 (IGSN71). The deflections are referred to the Geodetic Reference System 1980 (GRS80) ellipsoidal normals. The deflections of the vertical incorporate the reference system relationship between NAD 83(86) and ITRF94(1996.0), the datum offset of NAVD 88, and thecontributions from 2951 GPS on leveled benchmarks. The curvature of the plumb line correction has been applied. http://www.ngs.noaa.gov/DEFLEC/deflec.html We are particularly grateful to NGA (former National Imagery and Mapping Agency) for their assistance and their data contributions.

Resources

Name Format Description Link
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
21 se-0703.html https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
21 tablegri.html https://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords
21 1999cd.html https://www.ngdc.noaa.gov/mgg/gravity/1999cd.html
0 The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords

Tags

  • bouguer gravity
  • united states of america
  • land gravity
  • international council for science - world data system
  • nesdis
  • icsu-wds
  • absolute gravity
  • continent
  • national geophysical data center
  • noaa
  • satellite orbits
  • north america
  • gravity
  • u.s. department of commerce
  • observed gravity
  • earth science
  • doc/noaa/nesdis/ngdc
  • gridded gravity
  • solid earth
  • doc/noaa/nesdis/ncei
  • gravitational field
  • control surveys
  • free air anomaly
  • geodetics/gravity
  • national centers for environmental information
  • reference systems

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