NGS Gravity Station Data for the U.S.
- spatialRepresentationInfo
- referenceSystemInfo
- identificationInfo
- contentInfo
- contentInfo
- distributionInfo
- dataQualityInfo
- dataQualityInfo
- metadataMaintenance
(MI_Metadata)
fileIdentifier: gov.noaa.ngdc.mgg.geophysics:G01479
language: eng; USA
characterSet: (MD_CharacterSetCode) utf8
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contact: (CI_ResponsibleParty)
individualName: Brian Meyer
organisationName: NOAA National Centers for Environmental Information
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: 303-497-6125
address: (CI_Address)
electronicMailAddress: Brian.Meyer@noaa.gov
role: (CI_RoleCode) pointOfContact
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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spatialRepresentationInfo: (MD_VectorSpatialRepresentation)
geometricObjects: (MD_GeometricObjects)
geometricObjectType: (MD_GeometricObjectTypeCode) point
geometricObjectCount: 1633499
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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
dateType: (CI_DateTypeCode) revision
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: (withheld)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://epsg.org/crs_5715/MSL-depth.html
name: MSL depth
description: GML for Vertical CRS in EPGS Registry.
function: (CI_OnLineFunctionCode) information
role: (CI_RoleCode) resourceProvider
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: European Petroleum Survey Group
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
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.
function: (CI_OnLineFunctionCode) search
role: (CI_RoleCode) publisher
code: urn:ogc:def:crs:EPSG::5715
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identificationInfo: (MD_DataIdentification)
citation: (CI_Citation)
title: NGS Gravity Station Data for the U.S.
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
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
positionName: User Services
contactInfo: (CI_Contact)
phone: (CI_Telephone)
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
role: (CI_RoleCode) publisher
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
positionName: User Services
contactInfo: (CI_Contact)
phone: (CI_Telephone)
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
role: (CI_RoleCode) originator
abstract: The gravity station data (1,633,499 records) were gathered by various governmental organizations (and academia) using a variety of methods. This data base was received in March 1999. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (with terrain correction applied only in areas where substantial variations in local topography exist). The gravity station data has been adjusted to the International Gravity Standardization Net 1971 (IGSN 71) and the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the boundaries of the U.S., Alaska and Hawaii.
purpose: To provide easy access to global and regional gravity data and related models for scientific studies.
status: (MD_ProgressCode) completed
pointOfContact: (CI_ResponsibleParty)
individualName: Brian Meyer
organisationName: NOAA National Centers for Environmental Information
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: 303-497-6125
address: (CI_Address)
electronicMailAddress: Brian.Meyer@noaa.gov
role: (CI_RoleCode) pointOfContact
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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
type: (MD_KeywordTypeCode) theme
thesaurusName: (CI_Citation)
title: Global Change Master Directory (GCMD) Science Keywords
date: (CI_Date)
date: 2020-01-09
dateType: (CI_DateTypeCode) publication
edition: 9.1
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
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
role: (CI_RoleCode) custodian
descriptiveKeywords: (MD_Keywords)
keyword: Absolute Gravity
keyword: Bouguer Gravity
keyword: Free Air Anomaly
keyword: Gridded Gravity
keyword: Land Gravity
keyword: Observed Gravity
type: (MD_KeywordTypeCode) theme
thesaurusName: (CI_Citation)
title: Uncontrolled Keywords
date: (unknown)
descriptiveKeywords: (MD_Keywords)
keyword: ICSU-WDS > International Council for Science - World Data System
type: (MD_KeywordTypeCode) project
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title: Global Change Master Directory (GCMD) Project Keywords
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date: 2020-01-09
dateType: (CI_DateTypeCode) publication
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organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
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
role: (CI_RoleCode) custodian
descriptiveKeywords: (MD_Keywords)
keyword: Continent>North America>United States of America
type: (MD_KeywordTypeCode) place
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title: Global Change Master Directory (GCMD) Location Keywords
date: (CI_Date)
date: 2020-01-09
dateType: (CI_DateTypeCode) publication
edition: 9.1
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
contactInfo: (CI_Contact)
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linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
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
role: (CI_RoleCode) custodian
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
type: (MD_KeywordTypeCode) dataCentre
thesaurusName: (CI_Citation)
title: Global Change Master Directory (GCMD) Data Center Keywords
date: (CI_Date)
date: 2020-01-09
dateType: (CI_DateTypeCode) publication
edition: 9.1
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords
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
role: (CI_RoleCode) custodian
resourceConstraints: (MD_LegalConstraints)
accessConstraints: (MD_RestrictionCode) otherRestrictions
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
extent: (EX_Extent)
geographicElement: (EX_GeographicBoundingBox)
westBoundLongitude: -179.99882
eastBoundLongitude: -60.18833
southBoundLatitude: 20.00000
northBoundLatitude: 79.99166
temporalElement: (EX_TemporalExtent)
extent:
TimePeriod:
beginPosition:
endPosition:
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contentInfo: (MD_CoverageDescription)
attributeDescription: (unknown)
contentType: (unknown)
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: agency_code
attributeType: (unknown)
descriptor: A numeric code identifying the contributing source of a dataset.
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: Bouguer_anom_267
attributeType: (unknown)
descriptor: A Bouguer anomaly calculated using a Bouguer slab density of 2.67g/cc.Note that the gravity anomaly calculations were computed using the GRS67 model.
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Real: 659.2
minValue:
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units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: Bouguer_anom_sd
attributeType: (unknown)
descriptor: The standard deviation associated with the Bouguer Anomaly.
maxValue:
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minValue:
Real: 50.0
units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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aName: edit_code
attributeType: (unknown)
descriptor: A National Geodetic Survey code used to summarize record editing actions.
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: latitude
attributeType: (unknown)
descriptor: This is the geographic latitude expressed as a decimal number. The units are degrees. The range is -90.0 to +90.0.
maxValue:
Real: 79.99166
minValue:
Real: 20.0
units:
UnitDefinition:
identifier: degrees
name: degrees
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: longitude
attributeType: (unknown)
descriptor: This is the geographic longitude expressed as a decimal number. The units are degrees. The range is -180.0 to +180.0, where plus designates East longitude and minus designates West longitude.
maxValue:
Real: -60.18833
minValue:
Real: -179.99882
units:
UnitDefinition:
identifier: degrees
name: degrees
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: sea_level_elev_m
attributeType: (unknown)
descriptor: Height of the surface of observation above sea level, in meters (NOTE: most often from terrain surface but may be from lake surface).
maxValue:
Real: 9566.0
minValue:
Real: -85.3
units:
UnitDefinition:
identifier: meters
name: meters
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: obs_grav
attributeType: (unknown)
descriptor: The observed, or measured value of gravity in mGals at an occupied gravity station. In general, observed gravity varies from 978,000 to 984,200 mgals; therefore, many data contributors subtract a large constant from 900,000 to 982,000 from this field.Note that a constant of 978,000 mgals has been removed from the obs_grav values and that they are referenced to the IGSN71 datum.
maxValue:
Real: 5244.92
minValue:
Real: 72.0
units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: secondary_dist_m
attributeType: (unknown)
descriptor: The secondary_dist_ft variable converted to meters. From DMA.
maxValue:
Real: 1803.7
minValue:
Real: -0.1
units:
UnitDefinition:
identifier: meters
name: meters
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: obs_grav_sd
attributeType: (unknown)
descriptor: The standard deviation associated with the observed gravity value.
maxValue:
Real: 200.0
minValue:
Real: 0.0
units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: Free_air_anom
attributeType: (unknown)
descriptor: The anomalous gravity difference between an observed value and theoretical value. The gravity data has been corrected for latitude and elevation (free-air correction), but not for the density of the rock between datum and the plane of measurement (Bouguer correction).Note that the gravity anomaly calculations were computed using the GRS67 model.
maxValue:
Real: 631.0
minValue:
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units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: Free_air_anom_sd
attributeType: (unknown)
descriptor: The standard deviation of the Free-air Anomaly.
maxValue:
Real: 50.0
minValue:
Real: 0.0
units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: terr_corr_total
attributeType: (unknown)
descriptor: The terrain correction is an adjustment to the simple Bouguer correction that accounts for variations in terrain above and below the elevation of the gravity station at distances away from the point of measurement. Terrain below and above the level of the theoretical horizontal slab used to make the simple Bouguer correction results in a mass deficiency or excess that always yields an erroneously low gravity measurement. As a consequence, the terrain correction is always added to the simple Bouguer correction. The total terrain correction is the sum of the inner and outer zone terrain corrections described above.
maxValue:
Real: 184.8
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Real: 0.0
units:
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identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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aName: terr_corr_sd
attributeType: (unknown)
descriptor: The standard deviation associated with the terrain correction.
maxValue:
Real: 99.0
minValue:
Real: 0.0
units:
UnitDefinition:
identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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aName: source_id
attributeType: (unknown)
descriptor: A numeric code for the contributing author or organizations of the data.
maxValue:
Real: 95013
minValue:
Real: 0
units:
UnitDefinition:
identifier:
name:
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: station_char_code
attributeType: (unknown)
descriptor: An alphanumeric code which indicates the type of elevation used in reducing the measured gravity to anomaly values. Generally, elevation of land gravity station, if ocean measurement, then ocean depth positive downward from surface. In some situations this may represent instrument or bottom depth, ice thickness or alternative sea-level distance measurement. From DMA.
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: proprietary_code
attributeType: (unknown)
descriptor: A numeric code denoting whether a gravity data record is: 1)not proprietary data (unmonumented) code=1, or 2)not proprietary data (monumented) code=3Unique to the NGS93 data set.
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contentInfo: (MD_FeatureCatalogueDescription)
includedWithDataset: true
featureTypes:
LocalName:
featureCatalogueCitation: (unknown)
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distributionInfo: (MD_Distribution)
distributionFormat: (MD_Format)
name: Binary
version: (unknown)
distributor: (MD_Distributor)
distributorContact: (CI_ResponsibleParty)
organisationName: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
positionName: User Services
contactInfo: (CI_Contact)
phone: (CI_Telephone)
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
role: (CI_RoleCode) distributor
distributionOrderProcess: (MD_StandardOrderProcess)
fees: Depends on the data set
orderingInstructions: Ordering Instructions: Price information is available upon request. Custom Order Process: Contact Data Center
turnaround: 4 Days
transferOptions: (MD_DigitalTransferOptions)
transferSize:
Real: 73507455
onLine: (CI_OnlineResource)
linkage: https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
onLine: (CI_OnlineResource)
linkage: https://www.ngdc.noaa.gov/mgg/gravity/
transferOptions: (MD_DigitalTransferOptions)
offLine: (MD_Medium)
name: (MD_MediumNameCode) cdRom
mediumFormat: (MD_MediumFormatCode) iso9660 iso9660
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) repository
levelDescription: (MD_ScopeDescription)
other: NOAA National Centers for Environmental Information
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
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.
result: (missing)
report: (DQ_CompletenessCommission)
evaluationMethodDescription: Not available
result: (unknown)
report: (DQ_ConceptualConsistency)
measureDescription: Not available
result: (unknown)
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.
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: All data was processed by the source before being forwarded to the National Geophysical Data Center
dateTime: (unknown)
source: (LI_Source)
description: Source Contribution: Gravity survey data Source Type: varies
sourceCitation: (CI_Citation)
title: NGS Gravity Station Data for the U.S.
date: (CI_Date)
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
sourceExtent: (EX_Extent)
temporalElement: (unknown) (EX_TemporalExtent)
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 2012-10-10T10:32:44.674-06:00
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
address: (CI_Address)
electronicMailAddress: Brian.Meyer@noaa.gov
role: (CI_RoleCode) pointOfContact
