The obtaining of the spatio-temporal representation of the wet refractivity distribution in the lower troposphere using GPS has been a line of research that has recently achieved very promising results. We here present a review of the work done and discuss some aspects as well as trace some future lines of development to increase the impact of GPS data in meteorological studies. Starting from the refinement of the tomographic technique, we assessed its capabilities using simulations based on the ground network of GPS receivers at mount Kilauea, Hawaii, and finally applied the whole procedure to the GPS data campaign conducted at the Onsala Space Observatory, verifying the results there obtained using traditional meteorological tools and analysis.
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