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It is important to mention that the acronym GGOS has two very distinct meaning:
While the components of the GGOS organization are fully under the control of the IAG, the same is not true for all the components contributing to GGOS the observing system. Many parts of the infrastructure are provided by other organizations not even loosely affiliated with IAG. For example, the GPS system, which is crucial for the IGS, is operated and maintained by the U.S. Department of Defence. Many of the relevant satellite missions including satellite altimetry, gravity, and InSAR missions are under the control of space agencies, while GGOS only can utilize the observations. In the following, we will look at these two facets of GGOS. Before we do so, will have a brief look at the chronology of GGOS. |