U.S. Geoid Heights, Scientific Model (G96SSS)
This 2' geoid height grid for the conterminous United States is the G96SSS model.
The computation used 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)). By means of a Fast Fourier Transform (FFT) technique,
high frequency corrections were made to an underlying EGM96 geopotential model through
a remove, compute, and restore process. The gravity values are based on the International
Gravity Standardization Net 1971 (IGSN71). The geoid heights are referred to the Geodetic
Reference System 1980 (GRS80) ellipsoid. Unlike GEOID96, the G96SSS grid does not
incorporate GPS on leveled benchmarks. The G96SSS model is a gravimetric geoid in
a geocentric, ITRF94(1996.0) reference frame. It is necessary to subtract 12.0 cm
from the G96SSS values to obtain the geoid undulation between the best-fit global
geopotential surface and the GRS80 ellipsoid (both expressed in a tide free system).
Additional information is available at: http://www.ngs.noaa.gov 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:G01446
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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