new international centre for global earth models - sirgas · 2019. 10. 28. · gfz potsdam, germany...
TRANSCRIPT
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International Centre for Global Earth Models
http://icgem.gfz-potsdam.de/home
E. Sinem Ince, Sven Reißland,Franz Barthelmes (retired) and Kirsten Elger
1- Department 1: Geodesy2- Library and Information Services
GFZ-Potsdam
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ICGEM – Service of IAG
http://icgem.gfz-potsdam.de/home
International Gravity Field
Service (IGFS)
Bureau Gravimetrique
International (BGI)
Toulouse, France
International Centre for Global Earth Models (ICGEM)
GFZ
Potsdam, Germany
International Service for the Geoid (ISG)
Politecnico di Milano
Milano, Italy
International Geodynamics and Earth Tide Service
(IGETS),
EOST
Strasbourg, France
International Digital Elevation Model
Service (IDEMS), ESRI
Redlands, CA, USA
15 years of service to the Gravity Field related activities
Hosted and supported by GFZ.
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Objectives of ICGEM
• Collecting and archiving of all existing global gravityfield models (e.g. static)
• Making them available in a standardized format(.gfc format)
• Interactive visualisation of the models, theirdifferences, and their time variation
• Web interface to calculate gravity field functionals fromthe spherical harmonic models on freely selectible grids
• Evaluation of the static gravity field models
• Online discussion forum
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ICGEM Homepage
http://icgem.gfz-potsdam.de/home
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Information
Other IGFS services
ICGEM services
Our references
Home Page
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Static Gravity Field Models
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List of static gravity field models
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• The ultimate aim is to collect and make available the static gravity field models
• Any model from any institution is accepted as long as they are consistent with other already “reliable” models based on our evaluation results in spectral domain and w.r.t. GNSS/levelling-derived geoid undulations
• For other models (temporal, other celestial bodies and topographic) we do not apply any evaluation scheme but observe the consistency among models
Which models are accepted/published?
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Model
Release year
Model expansion
Data usedReferences Download option
Link to calculation
Service
Link to
visualization
DOI #
assignment
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Model information
References
Header
XGM2016
Coefficients
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DOI# Assignment
http://pmd.gfz-potsdam.de/panmetaworks/metaedit/
DOI Request
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DOI# Assignment
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Evaluation w.r.t. GNSS/Levelling
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3 Processing centre
Other groups
Monthly
Weekly
Daily
GRACE-FO solutions
coming soon…
Combined solutions
CSR, GFZ, JPL
Combination!
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Which (temporal) gravity field model is the best?
• Depends on the application
• Depends on the area
• Depends on the post processing, background models, assumptions, regularisation
• …
Which center or institution provides the best solutions?
For temporal models new product service since July, 2019
COST-G: Combination Service for Time Variable Gravity Field
https://cost-g.org/index.php?p=introduction
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Filtered or unfiltered coefficients
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Topographic gravity field models
New set of models on the ICGEM service
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New set of models on the ICGEM service
Topographic gravity field models
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Other Celestial Bodies
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Model type Model selection
Gravity field
functional selection
Filtering
Area selection
Reference
Tide
Calculation ServiceRegular Grid
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Model type Model selection
Gravity field
functional selection
Filtering
Area selection
Reference
Tide
Calculation ServiceRegular Grid
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Calculation Service
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Calculation Service
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Calculation Service
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Different areas – different projection
Ince et al. 2019
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Spherical harmonic degree expansions of the same model:
(a) 50, (b) 150, (c) 250, and
(d) 500 which correspond to
400, 133, 80, and 40 km half wavelength spatial resolutions.
ICGEM for educational purposes
Gravity anomalies in mGal with different spectral and spatial resolution of EIGEN-6C4.
Ince et al. 2019
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Improvement of spatial resolution in satellite-only Global Gravity Field ModelsExample gravity anomalies in Europe
GOCE (1062 Days 20091101 – 20130524)Resolution ~ 80 km
GRACE (6 Years, 2002…2008)Resolution ~ 150 km
Derived from 25 Satellites before CHAMP era (1999)Resolution~ 1500 km (grim5-S1)
CHAMP (7 Years, 2002…2009)Resolution ~ 300 km
mgal
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Calculation ServiceUser-defined points
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Calculation ServiceUser-defined points
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Calculation ServiceUser-defined points
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Area
Description of columns
Simplified equations
Results
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Reference
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3D Visualisation
Geoid undulation Gravity anomalies
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• Differences between two latestGOCE releases
• DIR-R6 and TIM-R6, differences in the polar regionsdue to different regularisationsapplied
3D Visualisation
Geoid undulation differences
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3D Visualisation
Mass change
Trend Annual
Jan 2009 May 2009
GIA
Ice
melting Large
signal
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Some other calculations
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Open access journalpaper with examples
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Updates Newsletter
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Discussion Forum
Needs users’
contribution to spread
the information in the
gravity field community!
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Why not creating a dynamic platform?
Suggestions are welcome!
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Users’ supportKnowledge exchange
• Contribution to the Discussion Forum– Question or answer
• Provision of GNSS/levelling datasets for evaluation purposes – To ICGEM, to others?
• Any feedback, comment, and critique is welcome. – Some good ideas
– Some possible improvements
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Thank you
for your attention!
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References
• Barthelmes F (2013): Definition of functionals of the geopotential and their calculation from spherical harmonic models: theory and formulas used by the calculation service of the International Centre for Global Earth Models (ICGEM); http://icgem.gfz-potsdam.de/ICGEM/; revised Edition, (Scientific Technical Report; 09/02), Potsdam: Deutsches GeoForschungsZentrum GFZ, 32 p. DOI: http://doi.org/10.2312/GFZ.b103-0902-26.
• Ince ES, Barthelmes F, Reißland S, Elger K, Förste C, Flechtner F, Schuh H (2019): ICGEM – 15 years of successful collection and distribution of global gravitational models, associated services, and future plans, Earth Syst. Sci. Data, 11, 647-674, https://doi.org/10.5194/essd-11-647-2019.