The Global Geodetic Observing System (GGOS): Detecting the Fingerprints of Global Change in Geodetic Quantities

Modern geodetic observations from a wide range of space and terrestrial technologies contribute to our knowledge of the solid Earth, atmosphere, ocean, cryosphere, and land water storage. These geodetic observations record the “fingerprints” of global change processes and thus are a crucial independent source of high accuracy information for many global change studies. Many of the geodetic techniques require a globally distributed ground infrastructure, and associated space segment elements. In the past decade and half a variety of techniquespecific services have been established under the auspices of the International Association of Geodesy (IAG) to facilitate global coordination of geodetic activities