简介：Theaimofthisinvestigationistostudyhowtouseagravimetric(quasi)geoidforlevellingbyGPSdatainanoptimalway.TheadventofprecisegeodeticGPShasmadetheuseofatechniquepossible,whichmightbecalledGPS-gravimetricgeoiddetermination.Inthisapproach,GPSheightsabovethereferenceellipsoidaredeterminedforpointswhoselevelled(orthometric)heightHisabovesealevelpeoplehavealreadysurveyed;forthesepoints,wethushavethevaluesofthegeoidundulationN.ThesevaluesarethenusedtoconstrainthegeoidundulationsN′obtainedfromthegravimetricsolution.
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