GPS also helps analyze global water resources

WaterGAP is a hydrological model used to model water shortage, groundwater depletion, and floods and droughts over the land area of the globe. The Frankfurt hydrologist Professor Petra Döll has examined how good a fit this model provides, using GPS observations and data from the GRACE satellite, which measures the gravitational field of the Earth. The study indicates that WaterGAP needs to be modified.

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