Dataset Identification:

Resource Abstract:
This 2' gravity anomaly grid for the conterminous United States is NOT the input data set used in development of the GEOID96 model. This gravity grid models the 1.7 million terrestrial and marine gravity data held in the National Geodetic Survey gravity data base in July 1996. The data used in this grid have NOT been augmented by gravity data contributions from NGA (former National Imagery and Mapping Agency (former Defence Mapping Agency)). Please note that the GEOID96 model itself does contain the NGA (former National Imagery and Mapping Agency) contributions. These gravity values are based on the International Gravity Standardization Net 1971 (IGSN71). Terrain corrected, atmospherically corrected, Bouguer anomalies were computed with respect to the Geodetic Reference System 1980 (GRS80) using NAD83 and NAVD88 coordinates. Terrain corrections were computed by FFT integration of 30" digital elevation data throughout the United States. These complete Bouguer anomalies were gridded by splines in tension. The free air anomaly grid was obtained by restoring the Bouguer plate with a 2' mean elevation grid. Additional information is available at http://www.ngs.noaa.gov/GEOID/geoid.html
Citation
Title U.S. Terrain Corrected Free Air Anomalies (96)
publication  Date   1999-01-01
Edition 1999 Edition
cited responsible party - publisher
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
cited responsible party - publisher
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
position Name User Services
Contact information
Telephone
Voice 303-497-6826
Fax 303-497-6513
Address
325 Broadway, Boulder, CO, 80305-3328 Country USA
electronic Mail Addressngdc.info@noaa.gov
hoursOfService 8am-5pm, Monday through Friday
cited responsible party - originator
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
position Name User Services
Contact information
Telephone
Voice 303-497-6826
Fax 303-497-6513
Address
325 Broadway, Boulder, CO, 80305-3328 Country USA
electronic Mail Addressngdc.info@noaa.gov
hoursOfService 8am-5pm, Monday through Friday
Topic Category:  geoscientificInformation
Theme keywords (theme):
EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Control Surveys
EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravitational Field
EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Gravity
EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Reference Systems
EARTH SCIENCE>SOLID EARTH>Geodetics/Gravity>Satellite Orbits
thesaurus name >
Title Global Change Master Directory (GCMD) Science and Services Keywords
revision  Date   2007-04
Edition Version 6.0.0.0.0
edition Date 2007-04
cited responsible party - resourceProvider
organisation Name  NASA/GSFC/SED/ESD/GCDC/GCMD > Global Change Master Directory, Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA
Contact information
Linkage for online resource
name GCMD Keywords, Version 6.0.0.0.0
URL:http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html
protocol http
link function information
Description Thesuarus for earth science keywords and associated directories hosted and maintained by NASA.
target application profile  web browser
Theme keywords (theme):
Absolute Gravity
Bouguer Gravity
Free Air Anomaly
Gridded Gravity
Land Gravity
Observed Gravity
thesaurus name >
Title Uncontrolled Keywords
project Keywords
ICSU-WDS > International Council for Science - World Data System
thesaurus name >
Title Global Change Master Directory (GCMD) Project Keywords
revision  Date   2016-12-12
publication  Date   1995-04-24
Edition 8.4.1
cited responsible party - publisher
organisation Name  NASA
position Name GCMD User Support Office
Contact information
Address
electronic Mail Addressgcmduso@gcmd.gsfc.nasa.gov
Linkage for online resource
name GCMD Feedback Form
URL:http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
link function information
Description Have a Comment for the GCMD?
cited responsible party -
organisation Name
Contact information
Linkage for online resource
name GCMD's Science Keywords and Associated Directory Keywords
URL:http://gcmd.nasa.gov/learn/keyword_list.html
link function information
Description This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.
Location keywords:
Continent>North America>United States of America
thesaurus name >
Title Global Change Master Directory (GCMD) Location Keywords
revision  Date   2016-12-01
publication  Date   1995-04-24
Edition 8.4.1
cited responsible party - publisher
organisation Name  NASA
position Name GCMD User Support Office
Contact information
Address
electronic Mail Addressgcmduso@gcmd.gsfc.nasa.gov
Linkage for online resource
name GCMD Feedback Form
URL:http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
link function information
Description Have a Comment for the GCMD?
cited responsible party -
organisation Name
Contact information
Linkage for online resource
name GCMD's Science Keywords and Associated Directory Keywords
URL:http://gcmd.nasa.gov/learn/keyword_list.html
link function information
Description This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.
dataCenter Keywords
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
thesaurus name >
Title Global Change Master Directory (GCMD) Data Center Keywords
revision  Date   2016-12-01
publication  Date   1995-04-24
Edition 8.4.1
cited responsible party - publisher
organisation Name  NASA
position Name GCMD User Support Office
Contact information
Address
electronic Mail Addressgcmduso@gcmd.gsfc.nasa.gov
Linkage for online resource
name GCMD Feedback Form
URL:http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso
link function information
Description Have a Comment for the GCMD?
cited responsible party -
organisation Name
Contact information
Linkage for online resource
name GCMD's Science Keywords and Associated Directory Keywords
URL:http://gcmd.nasa.gov/learn/keyword_list.html
link function information
Description This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.
Theme keywords (theme):
thesaurus name >
Title Science Domain > Earth Science
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Organization > GOVERNMENT AGENCIES-U.S. FEDERAL AGENCIES
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Feature > Geologic Feature
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Method > information processing
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Feature > Physiographic Feature
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Property > Measure
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Virtual International Authority File (VIAF) Corporate Names
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Realm > marine
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
Theme keywords (theme):
thesaurus name >
Title Activity > Observation
publication  Date   2018-12-14
other Citation Details  Cinergi keyword enhanced.File generated at Fri Dec 14 20:41:02 UTC 2018
purpose:
To provide easy access to global and regional gravity data and related models for scientific studies.
Resource language:  eng; USA
Resource progress code:  completed
Resource Maintenance Information
maintenance or update frequency:  irregular
Constraints on resource usage:
Constraints
Use limitation statement:
While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Constraints on resource usage:
Legal Constraints
use constraint:  otherRestrictions
Other constraints
Use Constraints: If you use this data, please cite the National Geophysical Data Center and the originator of the data.
Constraints on resource usage:
Legal Constraints
Access Constraints  otherRestrictions
Other constraints
Access Constraints: None
Spatial representation type code:  grid
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude  -130
eastBoundLongitude  -66
northBoundLatitude  53
southBoundLatitude  24
Temporal Extent
point of contact - pointOfContact
individual Name Susan McLean
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Contact information
Telephone
Voice (303) 497-6478
Fax (303) 497-6513
Address
E/GC2 325 Broadway, Boulder, CO, 80305-3328 Country USA
electronic Mail AddressSusan.McLean@noaa.gov
hoursOfService 7:30 - 5:00 Mountain
contact Instructions
Contact Data Center
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Grid spatial representation

number of grid dimensions: 2
Grid axis property:
Grid Dimension
Dimension Name:  row
Dimension Size 871
resolution
Distance 0.03333333333333333 decimalDegrees
Grid Dimension
Dimension Name:  column
Dimension Size 1921
resolution
Distance 0.03333333333333333 decimalDegrees
cell geometry type:  area
transformation parameter availability:
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Coverage description

Type of coverage content
Cell value attribute description:
Band
descriptor Value, in milligals of an observed gravity station value, after various corrections have been applied to the value.
sequence Identifier
name Gravity grid value
Long Wavelength  306.684
Short Wavelength  -160.874
units
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Content information: feature catalog description

Included With Dataset  true
Feature Types  
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Reference system information

Reference System Identifier
Identifier string: urn:ogc:def:crs:EPSG::5715
authority
Title Mean Sea Level depth
alternateTitle  MSL depth
revision  Date   2012-08-10
cited responsible party - resourceProvider
organisation Name
Contact information
Linkage for online resource
name MSL depth
URL:http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::5715
link function information
Description GML for Vertical CRS in EPGS Registry.
cited responsible party - publisher
organisation Name  European Petroleum Survey Group
Contact information
Linkage for online resource
name European Petroleum Survey Group Geodetic Parameter Registry
URL:http://www.epsg-registry.org/
link function search
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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Scope of quality information
scope level  repository
Level Description
other component described  NOAA National Centers for Environmental Information
Resource lineage description

Scope of quality information
scope level  dataset
Resource lineage description
source
source description  Source Contribution: Gravity survey data Source Type: varies
source citation
Title U.S. Terrain Corrected Free Air Anomalies (96)
publication  Date
cited responsible party - custodian
organisation Name  DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce
Contact information
Telephone
Voice 301-713-3191
Fax 301-713-4324
Address
Spatial Reference System Division 1315 East-West Highway N/NGS2, SSMC3, Room 8813, Silver Spring, MD, 20910 Country U.S.A.
electronic Mail Addressngs.cors@noaa.gov
Resource extent
Temporal Extent
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy Report
evaluation Method Description  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.
AbsoluteExternalPositionalAccuracy
name Of Measure Vertical Positional Accuracy Report
evaluation Method Description  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.
Completeness Commission
evaluation Method Description  Not available
ConceptualConsistency
measure Description  Not available
QuantitativeAttributeAccuracy
name Of Measure Quantitative Attribute Accuracy Assessment
measure Description  Statistical analysis.
evaluation Method Description  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.
Quantitative Result
result value 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.
value Units

Resource distribution information

Distributor
distributor contact - distributor
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
position Name User Services
Contact information
Telephone
Voice 303-497-6826
Fax 303-497-6513
Address
325 Broadway, Boulder, CO, 80305-3328 Country USA
electronic Mail Addressngdc.info@noaa.gov
hoursOfService 8am-5pm, Monday through Friday
Standard ordering process
fees Depends on the data set
Ordering Instructions  Ordering Instructions: Price information is available on request, or through the on-line store http:// ols.nndc.noaa.gov Prepay by check, money order, or bankcard There is a standard handling charge, with additional costs for special handling Order may be placed via fax, e-mail, regular mail, through the online store, or by telephone Custom Order Process: Contact Data Center for information.
turnaround
4 Days
Format
Format name Binary
Format version
Digital Transfer Options
transfer Size 6692764
Linkage for online resource
URL:https://www.ngdc.noaa.gov/mgg/fliers/se-0703.html
Linkage for online resource
URL:https://www.ngdc.noaa.gov/mgg/gravity/1999/document/html/tablegri.html
Linkage for online resource
URL:https://www.ngdc.noaa.gov/mgg/gravity/1999cd.html
Digital Transfer Options
Medium of distribution
name  cdRom
medium Format  iso9660 iso9660
Metadata data stamp:  2015-09-01
Resource Maintenance Information
date of next update:  2015-11-01
maintenance or update frequency:  annually
notes: 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.
notes: Translated from FGDC 2012-10-10T10:32:32.541-06:00
notes: Last Metadata Review Date: 2014-11-20
notes: This record has been automatically modified to include references to NCEI where applicable on 2015-09-01.
Metadata contact - pointOfContact
individual Name Brian Meyer
organisation Name  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
Contact information
Telephone
Voice 303-497-6125
Address
electronic Mail AddressBrian.Meyer@noaa.gov
Metadata scope code  dataset
Metadata language  eng; USA
Metadata character set encoding:   utf8
Metadata standard for this record:  ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
standard version:  ISO 19115-2:2009(E)
Metadata record identifier:  gov.noaa.ngdc.mgg.geophysics:G01444

Metadata record format is ISO19139-2 XML (MI_Metadata)