Mexico North-South Deflections (DMEX97)

This 2' surface deflection of the vertical grid for Mexico, and North-Central is the DMEX97 model. The computation used about one million terrestrial and marine gravity measurements heldin the NGS database as of March 1997. These gravity measurements were augmented by data contributions from NGA (former National Imagery and Mapping Agency), and satellitealtimeter derived gravity anomalies computed by Sandwell and Smith (1997). The deflection values themselves were obtained by numerical differentiation of cubic spline models along the meridians of the MEXICO97 geoid grid, followed by a correction for curvature of the plumb line, yielding surface deflections of the vertical. Since the EGM96 model was used to fill data gaps south of 20 degrees North latitude, the deflections in and around those regions will be less accurate. The gravity values are based on the International Gravity Standardization Net 1971 (IGSN71). The deflections are referred to Geodetic Reference System 1980 (GRS80) ellipsoidal normals oriented in the International Terrestrial Reference Frame 1994 (ITRF94(1996.0)). 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:G01432
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
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 Reference System urn:ogc:def:crs:EPSG::5715
Spatial Bounding Box Coordinates
N: 33
S: 14
E: -75
W: -119
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
  • 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 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
  • 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 North-South Deflections (DMEX97)
    Last Modified: 2017-09-25
    For questions about the information on this page, please email: Brian.Meyer@noaa.gov