Gravity Data For The Maryland/Virginia Area
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fileIdentifier: gov.noaa.ngdc.mgg.geophysics:G01475
language: eng; USA
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individualName: Brian Meyer
organisationName: NOAA National Centers for Environmental Information
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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)
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geometricObjectType: (MD_GeometricObjectTypeCode) point
geometricObjectCount: 5905
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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.
function: (CI_OnLineFunctionCode) information
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organisationName: European Petroleum Survey Group
contactInfo: (CI_Contact)
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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.
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: Gravity Data For The Maryland/Virginia Area
date: (CI_Date)
date: 1999-01-01
dateType: (CI_DateTypeCode) publication
edition: 1999 Edition
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
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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
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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
role: (CI_RoleCode) originator
abstract: The gravity station data (5,905 records) were compiled by the U. S. Geological Survey. This data base was received on July 11, 1997. Principal gravity parameters include observed gravity, Free-air anomalies and Bouguer anomalies. The Bouguer gravity anomaly values were computed using the 1967 gravity formula (International Association of Geodesy, 1971). See Open-File Report 90-265 for further information.
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
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voice: 303-497-6125
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electronicMailAddress: Brian.Meyer@noaa.gov
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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
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
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keyword: ICSU-WDS > International Council for Science - World Data System
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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: Continent>North America>United States of America>Maryland
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
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organisationName: NASA Goddard Space Flight Center, Earth Science Data and Information System
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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
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title: Global Change Master Directory (GCMD) Data Center Keywords
date: (CI_Date)
date: 2020-01-09
dateType: (CI_DateTypeCode) publication
edition: 9.1
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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
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: -79.4793
eastBoundLongitude: -75.7073
southBoundLatitude: 38.0388
northBoundLatitude: 39.9992
temporalElement: (EX_TemporalExtent)
extent:
TimePeriod:
beginPosition:
endPosition:
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contentInfo: (MD_CoverageDescription)
attributeDescription: (unknown)
contentType: (unknown)
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.
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minValue:
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units:
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identifier: degrees
name: degrees
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aName: longitude_min
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descriptor: The minute portion of the longitude when the longitude is given in degrees, minutes, and seconds. Values range from 0 to less than 60.
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units:
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identifier: degrees
name: degrees
dimension: (MD_Band)
sequenceIdentifier:
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aName: sea_level_elev_ft
attributeType: (unknown)
descriptor: Height of the surface of observation above sea level, in feetNOTE: most often from terrain surface but may be from lake surface.
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Real: 3040.0
minValue:
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units:
UnitDefinition:
identifier: Feet
name: Feet
dimension: (MD_Band)
sequenceIdentifier:
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aName: obs_grav
attributeType: (unknown)
descriptor: The observed, or measured value of gravity in mGals at an occupied gravity station.
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units:
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identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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aName: terr_corr
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 at the point of observation. As a consequence, the terrain correction is always added to the simple Bouguer correction.
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units:
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identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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aName: curvature_corr
attributeType: (unknown)
descriptor: The Bouguer gravity correction assumes that the mass between the measurement elevation and sea level can be approximated by an infinite slab (often using a slab density of 2.67 grams per cc). The curvature correction is subtracted from the Bouguer gravity correction and compensates for the mass of this slab which extends beyond the curvature of the Earth. The U.S. Geological Survey computes it as follows: curvature_corr = elev*(1.4639108e-3+elev*(4.449648e-14*elev-3.532715e-7))Where elev is the elevation of the gravity station in meters and the curvature correction is in units of milligals. This correction rarely exceeds a few tenths of a milligal and is often omitted.
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units:
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identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
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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).
maxValue:
Real: 59.27
minValue:
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units:
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identifier: milligals
name: milligals
dimension: (MD_Band)
sequenceIdentifier:
MemberName:
aName: Bouguer_anom
attributeType: (unknown)
descriptor: The residual value obtained after latitude correction, elevation correction (including both free-air and Bouguer corrections) and terrain corrections have been applied to gravity data. In many situations the terrain correction is assumed to be zero. When this is explicitly documented, the term " Simple Bouguer Anomaly " is often used. When one explicitly documents that the terrain correction has been applied the term " Complete Bouguer Anomaly " is often used.
maxValue:
Real: 47.15
minValue:
Real: -74.61
units:
UnitDefinition:
identifier: milligals
name: milligals
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contentInfo: (MD_FeatureCatalogueDescription)
includedWithDataset: true
featureTypes:
LocalName:
featureCatalogueCitation: (unknown) (CI_Citation)
title: Entity and Attribute Information
date: (unknown)
otherCitationDetails: Entity and Attribute Overview: Unavailable Entity and Attribute Detail Citation: See section 2.5.2
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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. 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
transferOptions: (MD_DigitalTransferOptions)
transferSize:
Real: 242105
onLine: (CI_OnlineResource)
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/tablereg.html
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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)
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role: (CI_RoleCode) processor
source: (LI_Source)
description: Source Contribution: Gravity survey data Source Type: varies
sourceCitation: (CI_Citation)
title: Gravity Data For The Maryland/Virginia Area
date: (CI_Date)
date: (unknown)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
organisationName: DOI/USGS > U.S. Geological Survey, U.S. Department of the Interior
contactInfo: (CI_Contact)
phone: (CI_Telephone)
voice: (703) 648-5953
address: (CI_Address)
deliveryPoint: 12201 Sunrise Valley Drive
city: Reston
administrativeArea: VA
postalCode: 20192
country: USA
onlineResource: (CI_OnlineResource)
linkage: http://www.usgs.gov/ask/index.php
role: (CI_RoleCode) originator
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extent:
TimePeriod:
beginPosition:
endPosition:
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) annually
dateOfNextUpdate: 2011-04-23
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 2012-10-10T10:32:43.126-06:00
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