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Alaska Terrain Corrected Free Air Anomalies (96)

This 2' x 4' gravity anomaly grid for Alaska is NOT the input data set used in development of the GEOID96 model. This gravity grid models the 1.1 million terrestrial and marine gravity data held in the National Geodetic Survey gravity data base in July 1996. The data used in this grid have NOT been augmented by gravity data contributions from NGA (former National Imagery and Mapping Agency (former Defence Mapping Agency)). Please note that the GEOID96 model itself does contain the NGA (former National Imagery and Mapping Agency) contributions. These gravity values are based on the International Gravity Standardization Net 1971 (IGSN71). Terrain corrected, atmospherically corrected, Bouguer anomalies were computed with respect to the Geodetic Reference System 1980 (GRS80) using NAD83 and NAVD88 coordinates. Terrain corrections were computed by an FFT method from 30" x 60" digital elevation data. These complete Bouguer anomalies were gridded by splines in tension. The free air anomaly grid was obtained by restoring the Bouguer plate with a 2' x 4' mean elevation grid. Additional information is available at: http://www.ngs.noaa.gov/GEOID/geoid.html
  • Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
  • ID not available.
Distribution Formats
  • Binary
Ordering Instructions Ordering Instructions: 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
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
303-497-6125
Brian.Meyer@noaa.gov
Time Period Unknown to Unknown
Spatial Bounding Box Coordinates
N: 72
S: 49
E: -126
W: -180
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • publication: 1999-01-01
Edition 1999 Edition
Dataset Progress Status
  • Complete
Data Update Frequency Irregular
Supplemental Information
Note that for the Alaska Geoid96 data the West Bounding Coordinate is actually -188 degrees.
Purpose To provide easy access to global and regional gravity data and related models for scientific studies.
Dataset Citation
  • Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
Originator(s)
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Publisher(s)
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords
  • EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Control Surveys
  • EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravitational Field
  • EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravity
  • EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Reference Systems
  • EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Satellite Orbits
Uncontrolled Keywords
  • Absolute Gravity
  • Bouguer Gravity
  • Free Air Anomaly
  • Gridded Gravity
  • Land Gravity
  • Observed Gravity
Place keywords
  • Continent>North America>United States of America>Alaska
Keywords
    Keywords
      Use Constraints
      • Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
      Access Constraints
      • Access Constraints: None
      Fees
      • Depends on the data set
      Lineage information for: dataset
      Processing Steps
      • All data were processed by the source before being forwarded to the National Geophysical Data Center
      Source Datasets
      • Alaska Terrain Corrected Free Air Anomalies (96)
        Last Modified: 2017-09-25
        For questions about the information on this page, please email: Brian.Meyer@noaa.gov