NGS Gravity Station Data for the U.S. | spatialRepresentationInfo|
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(MI_Metadata) fileIdentifier: gov.noaa.ngdc.mgg.geophysics:G01479 language: eng; USA characterSet: (MD_CharacterSetCode) utf8 hierarchyLevel: (MD_ScopeCode) dataset 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) return to top spatialRepresentationInfo: (MD_VectorSpatialRepresentation) geometricObjects: (MD_GeometricObjects) geometricObjectType: (MD_GeometricObjectTypeCode) point geometricObjectCount: 1633499 return to top 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 return to top 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 resourceMaintenance: (MD_MaintenanceInformation) maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) irregular 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 thesaurusName: (CI_Citation) title: Global Change Master Directory (GCMD) Project 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: Continent>North America>United States of America type: (MD_KeywordTypeCode) place thesaurusName: (CI_Citation) 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) 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: 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: return to top 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. maxValue: Real: 659.2 minValue: Real: -371.2 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: Real: 0.0 minValue: Real: 50.0 units: UnitDefinition: identifier: milligals name: milligals dimension: (MD_Band) sequenceIdentifier: MemberName: 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: Real: -436.1 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 minValue: Real: 0.0 units: UnitDefinition: identifier: milligals name: milligals dimension: (MD_Band) sequenceIdentifier: MemberName: 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: MemberName: 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. return to top contentInfo: (MD_FeatureCatalogueDescription) includedWithDataset: true featureTypes: LocalName: featureCatalogueCitation: (unknown) return to top 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 return to top 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 return to top 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: return to top 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 |