GRACE / GRACE-FO Mascons
Gov-Public
Monthly total water storage change from satellite gravity — the only direct signal of large-scale groundwater depletion.
Data, Monitoring & ForecastingActiveGRACE Water Storage DataGroundwater Modelling
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GRACE Terrestrial Water Storage Data
The GRACE and GRACE-FO satellite pairs measure changes in Earth's gravity field precisely enough to track total terrestrial water storage — groundwater, soil moisture, snow and surface water combined — at basin scale, monthly, since 2002. It is the only direct satellite measurement of large-scale groundwater depletion, and this page indexes the mascon solutions engineers actually use.