GRACE Earh Gravity Field Level 2 Collection
The GRACE level-2 products are the main outputs from the GRACE and GRACE-FO missions. They consist of the time average (10-day, monthly) solutions of the Earth gravity field in spherical harmonics.
GRACE is a joint project between the National Aeronautics and Space Administration ( NASA ) and the Deutsches Zentrum für Luft- und Raumfahrt ( DLR ). The mission has been proposed in 1996 jointly by the University of Texas at Austin, Center for Space Research ( UTCSR ), the German Research Centre for Geosciences ( GFZ ) and the Jet Propulsion Laboratories (JPL) in Pasadena. GRACE was selected in 1997 as second mission in NASA's Earth System Science Pathfinder ( ESSP ) program. As an innovation, the Principal Investigator Prof. Byron Tapley (UTCSR) and his team are ultimately responsible for developing the flight mission hardware from selection to a launch-ready condition, for accomplishing the scientific objectives and delivering the proposed measurements to the broader Earth science community and general public as expediently as possible. Co-Principal Investigator of the mission is Dr. Frank Flechtner (GFZ). Project management and systems engineering activities are carried out by JPL.
GRACE-FO is a joint project between the National Aeronautics and Space Administration ( NASA ) and the GeoForschungsZentrum ( GFZ ) Potsdam. GRACE-FO, launched May 22, 2018, is a successor to the original GRACE mission. The Principal Investigator at NASA JPL is Felix landerer. Co-Principal Investigator of the mission is Dr. Frank Flechtner (GFZ). Project management and systems engineering activities are carried out by JPL.
Simple
- Date (Révision)
- 2022-01-06
- Identificateur
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CNES:GRACE:RL05
- But
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The primary science objective of the GRACE and GRACE-FO missions is to measure the Earth’s gravity field and it’s time variability with unprecedented accuracy. The increase in accuracy has been achieved by utilizing two satellites following each other on the same orbital track. To consider precise attitude and non-gravitational forces both satellites are equipped with star cameras and accelerometers. The position and velocity of the satellites is measured using onboard GPS antennae and (for validation purposes) SLR retro-reflectors. Additionally, the twin satellites are interconnected by a K-band microwave link to measure the exact separation distance and its rate of change to an accuracy of better than 0.1 µm/s. These measurements are directly coupled to the seasonal and sub-seasonal variations in the continental hydrological cycle, to ice mass loss in the large glacier systems in Greenland or Antarctica, to long wavelength ocean circulation processes or to the transport of ocean heat to Earth’s poles. Additionally, GRACE provides the time variability of the Earth’ overall external shape, the geoid. Consequently, since its launch in March 2002 this fundamental dataset has enabled dramatic improvements of seasonal and inter-annual climate change estimates.
The secondary science objective of the GRACE and GRACE-FO missions is to obtain about 150 very precise globally distributed vertical temperature and humidity profiles of the atmosphere per day using the GPS radio occultation technique.
- Etat
- Mise à jour continue
- Fréquence de mise à jour
- Lorsque nécessaire
- Mots clés
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Geodynamic
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Gravitational field
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- Contraintes d'utilisation
- Autres restrictions
- Autres contraintes
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Data is public, although an ISDC account is mandatory
- Type de représentation spatiale
- Raster
- Distance de résolution
- 100 km
- Langue de la ressource
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eng
- Encodage des caractères
- Utf8
- Catégorie ISO
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- Sciences de la terre, géosciences
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- Date de début
- 2002-03-17
- Nom du système de référence
- WGS 1984
- Format (encodage)
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ASCII
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ASCII
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)
- Ressource en ligne
- Product description ( WWW:LINK-1.0-http--link )
- Ressource en ligne
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Average trend of the gravity signal
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WTS
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Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average trend
- Ressource en ligne
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Average semiannual of the gravity signal
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WTS
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Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average semiannual signal
- Ressource en ligne
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Average annual of the gravity signal
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WTS
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Gravity signal from GRACE and GRACE-FO (in Equivalent Water Heights), average annual signal
- Ressource en ligne
- Product download ( WWW:LINK-1.0-http--link )
- Ressource en ligne
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The Grace Plotter
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WWW:LINK-1.0-http--link
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Visualization service
- Ressource en ligne
- Cylindrical Gravity Anomalies ( WWW:LINK-1.0-http--link )
- Ressource en ligne
- Polar Gravity Anomalies ( WWW:LINK-1.0-http--link )
- Ressource en ligne
- Cylindrical Geoid Height Comparison ( WWW:LINK-1.0-http--link )
- Ressource en ligne
- Polar Geoid Height Comparison ( WWW:LINK-1.0-http--link )
- Ressource en ligne
- Cylindrical Water Heights Comparison ( WWW:LINK-1.0-http--link )
- Ressource en ligne
- Polar Water Heights Comparison ( WWW:LINK-1.0-http--link )
- Niveau
- Collection de données
Etendue
- Généralités sur la provenance
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Based on the time-variable (monthly or 10-day) solutions CNES/GRGS RL04, a mean Earth gravity field model complete to degree and order 300 has been computed: EIGEN-GRGS.RL04.MEAN-FIELD.linear_mean_pole.zero_slope_extrapolation. It contains time-variable coefficients up to degree and order 90. For the higher degree part, it is based on a combined GRACE+GOCE static model: EIGEN-6C. This model has been used for Precise Orbit Determination of the altimetry satellites following the GDR-E standards
- Identifiant de la fiche
- e747d804-a5d1-4fd1-bd9b-306a8ebd4904 XML
- Langue
- Français
- Jeu de caractères
- Utf8
- Type de ressource
- Collection de données
- Date des métadonnées
- 2024-05-03T10:40:03
- Nom du standard de métadonnées
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ISO 19115:2003/19139
- Version du standard de métadonnées
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1.0
Aperçus

Étendue spatiale
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