Mexico East-West 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 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 satellitealtimeter derived gravity anomalies computed by Sandwell and
Smith (1997). The deflection values themselves were obtained by numericaldifferentiation
of cubic spline models along the parallels 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) ellipsoidalnormals
oriented in the International Terrestrial Reference Frame 1994 (ITRF94(1996.0)). 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:G01431
Other Access | |
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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:-119
East:-75
South:14
North:33
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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