Mexico East-West Deflections (DMEX97)

Metadata Updated: February 8, 2018

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.

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Dates

Metadata Date September 25, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) January 1, 1999 (publication)
Frequency Of Update irregular

Metadata Source

Harvested from NOAA CSW Harvest Source

Additional Metadata

Resource Type Dataset
Metadata Date September 25, 2017
Metadata Created Date September 27, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) January 1, 1999 (publication)
Responsible Party DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Contact Email
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., Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data., Access Constraints: None
Bbox East Long -75
Bbox North Lat 33
Bbox South Lat 14
Bbox West Long -119
Coupled Resource
Frequency Of Update irregular
Guid gov.noaa.ngdc.mgg.geophysics:G01431
Harvest Object Id dbfa4079-7280-4ead-995d-711b14a264ca
Harvest Source Id 2aed8e29-fc5b-4cde-aa66-fb1118fd705e
Harvest Source Title NOAA CSW Harvest Source
Licence
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System urn:ogc:def:crs:EPSG::5715
Spatial Harvester True

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