Global Gravity Grids, Geoid Height and Gravity Anomaly Profiles
(MI_Metadata)
fileIdentifier: gov.noaa.ngdc.mgg.geophysics:G01146
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
identificationInfo: (MD_DataIdentification)
citation: (CI_Citation)
title: Global Gravity Grids, Geoid Height and Gravity Anomaly Profiles
date: (CI_Date)
date: 1986-01-01
dateType: (CI_DateTypeCode) publication
edition: First
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 entire collection of GEOSAT ERM (Nov.'86 - Dec. '89) data over land and ice regions is held at the National Geophysical Data Center (NGDC). These data will yield reasonable elevation values for land and ice regions of gently varying elevation. This data collection should not be used in regions of highly variable terrain. This satellite altimeter data base contains precise geoid and gravity anomaly profiles which were constructed from the average of 66 repeat cycles of GEOSAT. The data were developed by Professor David T. Sandwell at the University of California in San Diego. The data are contained in two files: (1) geo66asc.bin (2,383,232records) contains the ascending profiles which run southeast to northwest between 72S and 72N, and (2) geo66des.bin (2,397,888 records) contains all of the descending profiles. The dataparameters in addition to time and location are geoid height, gravity anomaly, and uncertainty in gravity anomaly. GEOSAT 66 was updated in 1994 to include the 3rd and last year of data. Thus 66 repeat cycles of data are included in the AVERAGE profile calculation. This satellite altimeter data base was contributed by NOS/Geoscience Laboratory and contains data collected during the first 18 months of the original "Geodetic Mission" of the U.S. Navy Geodetic Satellite (GEOSAT). These digital data are in the form of geophysical data records (GDRs) which are described in NOAA Technical Memorandum NOS NGS-46. The data are observed over a tightly spaced (typically 2 or 3 km at 60 degrees latitude) ground track pattern, and are global in coverage. The Southern Ocean data contained in this subset of the original Geodetic Mission were declassified in 1990 and received at NGDC in mid 1991. GEOSAT GRAVITY ANOMALY GRID SOUTH OF 30 SOUTH K.M. Marks, DC McAdoo, and W.H.F. Smith The Geosciences Laboratory, ocean and Earth Sciences (NOAA), has produced a digital gravity anomaly grid computed from recently declassified Geosat Geodetic Mission data, combined with Exact Repeat Mission data, for the region between 30 S and 72 S latitudes. The grid spacing is 0.04 degrees in latitude, and 0.05 degrees in longitude. The grid file, g30_UNIX.BIN, is a binary file of two-byte signed integers, stored in raster scan line (bands of Latitude) order. There are 1051 scan lines with the first line at 30 S and the last at 72 S latitude. Each line has 7201 integers with the first element at 0 E longitude and the last element at 360 E longitude. Values equal to 32767 indicate land areas where Geosat gravity is unavailable; all other values should be multiplied by 0.01 to yield Free-Air Gravity anomalies in mGals. Data in g30__UNIX.BIN are in "normal" byte order (Sun, Mac, etc.); the equivalent file G30_DOS.DOS is in "swapped" byte order (DEC, PC, etc.). RAPP92: This data base was compiled by Dr. Richard H. Rapp, Ohio State University and was received in April, 1993. The data base consists of the following: One file containing a 0.125 degree grid of free-air gravity anomalies and their standard deviations between +/- 72 degrees latitude. The anomalies in the ocean areas have been derived from a combination of Geos-3, Seasat and Geosat altimeter data and the ETOP05U bathymetric data. Although gravity values are given for land areas they have been, primarily, computed from the OSU91A potential coefficient model that is complete to degree 360. One file containing a 0.125 degree gridded mean sea surface (in the mean tide system), in the same geographic region as the data given in the file above. One file containing 30-minute x 30-minute mean gravity anomalies and geoid undulations (in the tide free system), derived form OSU's 0.125 degree gridded point anomalies and geoid undulations. One file containing 1 degree x 1 degree mean gravity anomalies and geoid undulations (in the tide free system), as derived from the original gridded point values. Principal gravity parameters include mean gravity anomaly and mean geoid undulations. The gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) Theoretical Formula. The data are global in coverage where data are available. SANDWELL: The high density Geosat/GM altimeter data south of 30 S have finally arrived. In addition, ERS-1 has completed more than 6 cycles of its 35-day repeat track. These data provide a dramatically improved view of the marine gravity field. The files in this directory contain global marine gravity anomalies gridded on a Mercator projection (see Sandwell and Smith, EOS Trans. AGU, v. 73, p. 133, Fall 1992 AGU meeting supplement). The grid was derived from the following data sources: Seasat - Used in areas north of 30 S latitude. Profiles within 10 km of a Geosat/ERM track were excluded. Geosat/ERM - Average of 62 Geosat Exact Repeat Mission profiles. Geosat/GM - Recently declassified Geosat Geodetic mission data south of 30 S. ERS-1 - Fast delivery IGDR's obtained from Bob Cheney at NOAA. Six, 35-day repeat cycles were used in the grid. All of these data were gridded using the method described in: Sandwell, D.T., Antarctic marine gravity field from high-density satellite altimetry, Geophys. J. Int., v. 109, p. 437-448, 1992. The method was adapted to accommodate multiple satellite inclinations (Sandwell, D.T., A detailed view of the South Pacific from satellite altimetry, J. Geophys. Res., v. 89, p. 1089-1104, 1984). The gridded data are stored in an integer*2 format without any header or record information. world_grav.image - A 4224 by 7800 grid of 2-byte integers = 65894400 bytes. The gravity anomaly units are 0.1 milligal. The Mercator projected image spans longitudes of 0 E to 390 E and latitudes from 72.006 N to -72.006 N. The center of the upper left grid cell (i.e. the first integer in the file) is located at 71.998 N, 0.025 E. Longitudes increase with a 1/20 degree spacing. The center of the last integer in the file is located at -71.997 N, 389.975 E.
purpose: Provide Access to a WW Collection of Geoid and Gravity Anomaly Profiles
status: (MD_ProgressCode) underDevelopment
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) unknown
descriptiveKeywords: (MD_Keywords)
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravity
keyword: EARTH SCIENCE>SOLID EARTH>Geophysical Fields>Gravity Field
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravitational Field
keyword: EARTH SCIENCE>LAND SURFACE
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Reference Systems
keyword: EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Geoid Properties
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: Derived Height
keyword: Exact Repeat Mission
keyword: Geodetic Mission
keyword: Free-Air Anomaly
keyword: SEASAT
keyword: GEOS3
keyword: GEOSAT
keyword: Sea Surface
type: (MD_KeywordTypeCode) theme
thesaurusName: (CI_Citation)
title: Uncontrolled Keywords
date: (unknown)
descriptiveKeywords: (MD_Keywords)
keyword: Global
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: None
resourceConstraints: (MD_LegalConstraints)
accessConstraints: (MD_RestrictionCode) otherRestrictions
otherConstraints: Access Constraints: None
language: eng; USA
topicCategory: (MD_TopicCategoryCode) geoscientificInformation
extent: (EX_Extent)
geographicElement: (EX_GeographicBoundingBox)
westBoundLongitude: -180.000000
eastBoundLongitude: 180.000000
southBoundLatitude: -90.000000
northBoundLatitude: 90.000000
temporalElement: (EX_TemporalExtent)
extent:
TimePeriod:
beginPosition: 1990-01-01
endPosition:
supplementalInformation: Formerly FE 1038, 981, 1068, 1069, 1073, 1107
return to top
distributionInfo: (MD_Distribution)
distributionFormat: (MD_Format)
name: ASCII
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: 600.000000
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
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
metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) annually
dateOfNextUpdate: 2011-04-23
maintenanceNote: This metadata was automatically generated from the Content Standard for Digital Geospatial Metadata: Extensions for Remote Sensing Metadata standard (version FGDC-STD-012-2002) using the 2012-08-08 version of the FGDC RSE to ISO 19115-2 transform.
maintenanceNote: Translated from FGDC 2012-10-10T10:31:50.265-06:00
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
