U.S. North-South Deflections (DEFLEC96)
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.
- Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
- ID not available.
gov.noaa.ngdc.mgg.geophysics:G01442
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Ordering Instructions | Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone. Custom Order Process: Contact Data Center for information. |
Distributor | User Services DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce 303-497-6826 ngdc.info@noaa.gov |
Dataset Point of Contact | Brian Meyer NOAA National Centers for Environmental Information 303-497-6125 Brian.Meyer@noaa.gov |
Time Period | Unknown to Unknown |
Spatial Reference System | urn:ogc:def:crs:EPSG::5715 |
Spatial Bounding Box Coordinates |
West:-130
East:-66
South:24
North:53
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Spatial Coverage Map |
Documentation links not available. |
Publication Dates |
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Edition | 1999 Edition |
Dataset Progress Status | Complete - production of the data has been completed |
Data Update Frequency | Irregular |
Purpose | To provide easy access to global and regional gravity data and related models for scientific studies. |
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Theme keywords | Global Change Master Directory (GCMD) Science Keywords
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Data Center keywords | Global Change Master Directory (GCMD) Data Center Keywords
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Place keywords | Global Change Master Directory (GCMD) Location Keywords
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Project keywords | Global Change Master Directory (GCMD) Project Keywords
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Last Modified: 2017-09-25
For questions about the information on this page, please email:Brian.Meyer@noaa.gov