Mexico Geoid Heights (MEXICO97)
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fileIdentifier: gov.noaa.ngdc.mgg.geophysics:G01433
language: eng; USA
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electronicMailAddress: Brian.Meyer@noaa.gov
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dateStamp: 2017-09-25
metadataStandardName: ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
metadataStandardVersion: ISO 19115-2:2009(E)
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referenceSystemInfo: (MD_ReferenceSystem)
referenceSystemIdentifier: (RS_Identifier)
authority: (CI_Citation)
title: Mean Sea Level depth
alternateTitle: MSL depth
date: (CI_Date)
date: 2012-08-10
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linkage: https://epsg.org/crs_5715/MSL-depth.html
name: MSL depth
description: GML for Vertical CRS in EPGS Registry.
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organisationName: European Petroleum Survey Group
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linkage: https://epsg.org/home.html
name: European Petroleum Survey Group Geodetic Parameter Registry
description: Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations.
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code: urn:ogc:def:crs:EPSG::5715
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identificationInfo: (MD_DataIdentification)
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title: Mexico Geoid Heights (MEXICO97)
date: (CI_Date)
date: 1999-01-01
dateType: (CI_DateTypeCode) publication
edition: 1999 Edition
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) publisher
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organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
positionName: User Services
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voice: 303-497-6826
facsimile: 303-497-6513
address: (CI_Address)
deliveryPoint: 325 Broadway
city: Boulder
administrativeArea: CO
postalCode: 80305-3328
country: USA
electronicMailAddress: ngdc.info@noaa.gov
hoursOfService: 8am-5pm, Monday through Friday
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abstract: 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.
purpose: To provide easy access to global and regional gravity data and related models for scientific studies.
status: (MD_ProgressCode) completed
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organisationName: NOAA National Centers for Environmental Information
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descriptiveKeywords: (MD_Keywords)
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Control Surveys
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravitational Field
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravity
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Reference Systems
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Satellite Orbits
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title: Global Change Master Directory (GCMD) Science Keywords
date: (CI_Date)
date: 2020-01-09
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edition: 9.1
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name: Global Change Master Directory (GCMD) Keywords
description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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keyword: Absolute Gravity
keyword: Bouguer Gravity
keyword: Free Air Anomaly
keyword: Gridded Gravity
keyword: Land Gravity
keyword: Observed Gravity
type: (MD_KeywordTypeCode) theme
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description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
function: (CI_OnLineFunctionCode) information
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keyword: Continent>North America>Mexico
type: (MD_KeywordTypeCode) place
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title: Global Change Master Directory (GCMD) Location Keywords
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date: 2020-01-09
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name: Global Change Master Directory (GCMD) Keywords
description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
function: (CI_OnLineFunctionCode) information
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descriptiveKeywords: (MD_Keywords)
keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
keyword: DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
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title: Global Change Master Directory (GCMD) Data Center Keywords
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date: 2020-01-09
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name: Global Change Master Directory (GCMD) Keywords
description: The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords.
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resourceConstraints: (MD_LegalConstraints)
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otherConstraints: 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.
resourceConstraints: (MD_LegalConstraints)
useConstraints: (MD_RestrictionCode) otherRestrictions
otherConstraints: Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
resourceConstraints: (MD_LegalConstraints)
accessConstraints: (MD_RestrictionCode) otherRestrictions
otherConstraints: Access Constraints: None
spatialRepresentationType: (MD_SpatialRepresentationTypeCode) grid
language: eng; USA
topicCategory: (MD_TopicCategoryCode) geoscientificInformation
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westBoundLongitude: -119
eastBoundLongitude: -75
southBoundLatitude: 14
northBoundLatitude: 33
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beginPosition:
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contentInfo: (MD_CoverageDescription)
attributeDescription: (unknown)
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sequenceIdentifier:
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aName: Gravity grid value
attributeType: (unknown)
descriptor: Value, in milligals of an observed gravity station value, after various corrections have been applied to the value.
maxValue:
Real: 6.759
minValue:
Real: -47.597
units:
UnitDefinition:
identifier:
name:
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contentInfo: (MD_FeatureCatalogueDescription)
includedWithDataset: true
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featureCatalogueCitation: (unknown)
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name: Binary
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organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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deliveryPoint: 325 Broadway
city: Boulder
administrativeArea: CO
postalCode: 80305-3328
country: USA
electronicMailAddress: ngdc.info@noaa.gov
hoursOfService: 8am-5pm, Monday through Friday
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fees: Depends on the data set
orderingInstructions: 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.
turnaround: 4 Days
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linkage: https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
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linkage: https://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html
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dataQualityInfo: (DQ_DataQuality)
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level: (MD_ScopeCode) repository
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other: NOAA National Centers for Environmental Information
lineage: (LI_Lineage)
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description: 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.
dateTime:
DateTime: 2015-04-22T00:00:00
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
report: (DQ_AbsoluteExternalPositionalAccuracy)
nameOfMeasure: Horizontal Positional Accuracy Report
evaluationMethodDescription: Horizontal accuracy varies from source contributor to source contributor. However, horizontal positions are usually taken from topographic maps of the area being surveyed. Accuracy may range up to +/- 100 feet.
result: (missing)
report: (DQ_AbsoluteExternalPositionalAccuracy)
nameOfMeasure: Vertical Positional Accuracy Report
evaluationMethodDescription: Vertical accuracy varies from source contributor to source contributor. However, vertical positions are usually taken from topographic maps of the area being surveyed, monumented benchmark locations, or they are determined by the use of the Global Positioning System (GPS). Accuracy may range from meters to centimeters or better.
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measureDescription: Not available
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report: (DQ_QuantitativeAttributeAccuracy)
nameOfMeasure: Quantitative Attribute Accuracy Assessment
measureDescription: Statistical analysis.
evaluationMethodDescription: Gravity data values are the result of the measurement of small variations in the gravitational field of the earth. The magnitudes and ranges of these variations are well known in the potential field discipline.
result: (DQ_QuantitativeResult)
valueUnit:
BaseUnit:
identifier: meters
unitsSystem: http://www.bipm.org/en/measurement-units/
value:
Record: Variable: the average acceleration on the Earth's surface is about 980 centimeters per second squared, which is equal to 980 gals, but increases by about 1/2 percent from equator to pole.
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description: All data were processed by the source before being forwarded to the National Geophysical Data Center
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description: Source Contribution: Gravity survey data Source Type: varies
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title: Mexico Geoid Heights (MEXICO97)
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date: (unknown)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: 301-713-3191
facsimile: 301-713-4324
address: (CI_Address)
deliveryPoint: Spatial Reference System Division 1315 East-West Highway N/NGS2, SSMC3, Room 8813
city: Silver Spring
administrativeArea: MD
postalCode: 20910
country: U.S.A.
electronicMailAddress: ngs.cors@noaa.gov
role: (CI_RoleCode) custodian
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extent:
TimePeriod:
beginPosition:
endPosition:
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) annually
dateOfNextUpdate: 2015-11-01
maintenanceNote: This metadata was automatically generated from the Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2012-08-08 version of the FGDC RSE to ISO 19115-2 transform.
maintenanceNote: Translated from FGDC 2012-10-10T10:32:28.867-06:00
maintenanceNote: Last Metadata Review Date: 2017-09-25
maintenanceNote: This record has been automatically modified to include references to NCEI where applicable on 2015-09-01.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
positionName: Metadata Specialist
role: (CI_RoleCode) editor
contact: (CI_ResponsibleParty)
individualName: Brian Meyer
organisationName: NOAA National Centers for Environmental Information
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: 303-497-6125
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