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Geodesy is the field of science that is involved in the measurement of the size and shape of the earth as well as its gravity field. Modern geodetic tools such as the global positioning system (GPS), radar altimetry, laser altimetry, synthetic aperture radar, and satellite-to-satellite tracking are accurate enough to monitor time variations in the earth related to plate tectonics, post-glacial, ocean circulation and atmospheric circulation.
Modern geodesy attempts to solve geophysical problems by assimilating observable phenonema (such as variations in the Earth's rotation, gravity, geocenter, and surface deformations) into models. Today, these observations come from a variety of sources including Satellite Laser Ranging (SLR), Very-Long-Baseline Interferometry (VLBI), the Global Positioning System (GPS), and Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS).
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