advancing geodesy - International Association of Geodesy

Inter-commission Committees• Inter-commission Committee on Theory.http://der.topo.auth.gr/icct• Inter-commission Committee on PlanetaryGeodesy.• Inter-commission Committee on GeodeticStandards.The IAG Project: IGGOS• Integrated Global Geodetic Observing System• Envisaged results- Global patterns of tectonic deformation- Global patterns of height changes on land, ofice covers and of sea level- Deformation due to mass transfer betweenatmosphere, hydrosphere and solid Earth- Separation of effects of mass changes frommotion and thermal expansion- Separation of ocean effects from solid effects("absolute" sea level)- Quantification of angular momentumexchange and mass transferIndividual MembershipBenefits- Substantial reduction on the individualsubscription rate to the Journal of Geodesy- Becoming a member of an IAG Commission ofchoice- Reduction of registration fee for IAGmeetings- Right to participate in the IAG electionprocess as nominator and/or nomineeBackground image courtesy of Earth Sciences and Image Analysis Laboratory, NASAJohnson Space Center. STS057-73-75 (http://eol.jsc.nasa.gov)IAG Servicesc/o University ofCopenhagen,Department of Geophysics,Juliane Maries Vej 30,DK-2100Copenhagen O.DenmarkFax: +45 35365357International GPS Servicehttp://igscb.jpl.nasa.govInternational VLBI Service for Geodesy andAstrometryhttp://ivscc.gsfc.nasa.govInternational Laser Ranging Servicehttp://ilrs.gsfc.nasa.govInternational Gravimetric Bureauhttp://bgi.cnes.frInternational Geoid Servicehttp://www.iges.polimi.itInternational Center for Earth Tideshttp://www.astro.oma.be/ICETPermanent Service for Mean Sea Levelhttp://www.pol.ac.uk/psmslInternational DORIS Servicehttp://ids.cls.frTime Section of the Int. Bureau of Weightsand Measureshttp://www.bipm.orgIAG Bibliographic Servicehttp://www.leipzig.ifag.deFor more information please visit the IAG website:http://www.iag-aig.orgIAG Central BureauInternational Earth Rotation and ReferenceSystems Servicehttp://www.iers.orgIAG Communication andOutreach BranchBudapest University ofTechnology and Economics,Department of Geodesy andSurveying,P.O. Box 91.H-1521, BudapestHungaryFax: +36 1 4633192http://www.iag-aig.orgTheInternationalAssociationofGeodesyAn Association of the International Unionof Geodesy and Geophysics... advancinggeodesy ...

The Mission of IAGis the advancement of geodesy, an Earth science thatstudies the size, shape, orientation and gravity fieldof the Earth, planets and their satellites including thetemporal variations of these features.The IAG accomplishes its mission• by advancing geodetic theory through researchand teaching;• by collecting, analysing and modellingobservational data;• by stimulating technological development; and• by providing a consistent representation of thefigure, rotation and gravity field of the Earth.IAG's objectives• To foster research and development on- Definition of reference systems- Rotation of the Earth and Planets- Positioning and Deformation- Gravity field determination- Ocean and sea level variations- Time transfer,- Signal propagation through the planet'satmosphere.• To Support and maintain geodetic referencesystems.• To Provide observational and processed data,standards, methodologies and models.• To Stimulate development of space techniques toincrease the resolution of geodetic data.• To Initiate, coordinate and promote internationalcooperations.• To promote the development of geodeticactivities in the world, especially in developingcountries.The structure of IAGCommissions, Inter-commission Committees, Services,IAG Projects, Communication and Outreach BranchCommission 1. Reference Frameshttp://iag.dgfi.badw.de• Establishment,maintenance,improvement of thegeodetic referenceframes.• Advanced terrestrial andspace observationtechniques development.• Internationalcollaboration for thedeployment of spacegeodetic observatories.• Theory and coordinationof astrometricobservations.Commission 2.Gravity fieldhttp://www.ceegs.ohio-state.edu/iagcommission2• Terrestrial, marine, andairborne gravimetry.• Satellite gravity fieldobservations.• Gravity field modelling.• Time variable gravity field.• Geoid determination.• Satellite orbit modelling and determination.The EPN NetworkGravity anomalies from EIGEN-GRACE01Smodel (GFZ Potsdam)GRACE Satellites(Illustration)Commission 3. Geodynamics andEarth Rotationhttp://www.astro.oma.be/IAG• Earth orientation (Earth rotation,polar motion, nutation andprecession).• Earth tides.• Tectonics and CrustalDeformation.• Sea surface topography and sealevel changes.• Planetary and lunar dynamics.• Effects of the Earth's fluid layers (e.g. post-glacialrebound, loading).Commission 4. Positioning andApplicationshttp://www.gmat.unsw.edu.au/iag/iag_comm4.htm• Terrestrial and satellite based positioning systemdevelopment, includingsensor and informationfusion.• Navigation and guidanceof platforms.• Interferometric laser andradar applications (e.g.InSAR).• Application of geodetic positioning using threedimensional geodetic networks including monitoringof deformations.• Application of geodesy to engineering.Earth’s precession andnutationEnviSat (Photo: ESA)• Atmospheric investigations using space geodetictechniques.