Sensors aboard a suite of NASA satellites continuously observe and measure water across Earth's primary environments: on land, in the ocean, and throughout the atmosphere.

These satellite observations support monitoring of the broader water cycle, tracking how water is distributed and moves across different Earth systems.

Satellite Observation of Earth's Water

The Global Precipitation Measurement (GPM) mission was developed to help scientists measure and understand the amount of rain and snow falling globally.

Accurate global precipitation data is essential for analyzing weather and climate impacts on Earth's environment, water and energy cycles, fresh water availability, agriculture, and natural disaster response. Precipitation connects all four of Earth's primary spheres: the hydrosphere, geosphere, atmosphere, and biosphere.

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