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Dataset Overview | National Centers for Environmental Information (NCEI)

Mexico Geoid Heights (MEXICO97)

This 2' geoid height grid for Mexico, and North-Central America, is the MEXICO97 geoid model. The computation used about one million terrestrial and marine gravity measurements held in the NGS database as of March 1997. These gravity measurements were augmented by data contributions from NGA (former National Imagery and Mapping Agency), and satellite altimeter-derived gravity anomalies computed by Sandwell and Smith (1997). Large data gaps south of 20 degrees North latitude were filled with 15'x15' gravity values derived from the EGM96 global geopotential model. This helped control interpolation errors across the data gaps during the gridding of terrain corrected Bouguer anomalies. After gridding of the Bouguer anomalies, the Bouguer plate was restored, a degree 360 model of gravity anomalies (from EGM96) was removed, and the residual free-air anomalies in the data gaps (south of 20 degrees North Latitude) were zeroed. (This zeroing was found to be the best way currently available to yield a reasonable geoid in the data gaps). The residual Faye anomalies were converted to residual co-geoid undulations through a 1-D FFT formulation of Stokes' integral, and finally the EGM96 undulation model was restored, and the indirect effect applied. This means that in the data gaps, long wavelength information is provided by EGM96, short wavelength information is provided by the 2'x2' DTED (during the application of the indirect effect), but medium wavelength information (usually provided by gravity measurements) is missing altogether. Although the exact accuracy of the geoid in the data gaps is difficult to ascertain, the quoted accuracy for EGM96 (which is the primary source of geoid information in the data gaps) is below 50 cm in these areas. 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, centered at the origin of the International Terrestrial Reference Frame 1994 (ITRF94(1996.0)). Additional information is available at: http://www.ngs.noaa.gov/GEOID/MEXICO97/ 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:G01433
Other Access
Distribution Formats
  • Binary
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: -119
East: -75
South: 14
North: 33
Spatial Coverage Map
Documentation links not available.
Publication Dates
  • publication: 1999-01-01
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.
Dataset Citation
  • Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
Originators
  • User Services
    DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Publishers
  • NOAA National Centers for Environmental Information
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Theme keywords Global Change Master Directory (GCMD) Science 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
Data Center keywords Global Change Master Directory (GCMD) Data Center Keywords
  • DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
  • DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Place keywords Global Change Master Directory (GCMD) Location Keywords
  • Continent>North America>Mexico
Project keywords Global Change Master Directory (GCMD) Project Keywords
  • ICSU-WDS > International Council for Science - World Data System
Use Constraints
  • Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
Access Constraints
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
  • 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
  • Mexico Geoid Heights (MEXICO97)
    • Description of Source: Source Contribution: Gravity survey data Source Type: varies
    • Temporal extent used: Unknown to Unknown
Lineage information for: repository
Processing Steps
  • 2015-04-22T00:00:00 - NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015.
Last Modified: 2017-09-25
For questions about the information on this page, please email: Brian.Meyer@noaa.gov