NASA’s SMAP mission tracks Earth’s invisible water cycles from 685 kilometers above the surface.
In short: Soil moisture is a vital, hidden pulse of our planet, dictating everything from agricultural yields to the severity of floods. NASA’s Soil Moisture Active Passive mission was designed to map this moisture globally, providing a high-resolution view of how Earth’s water, energy, and carbon cycles interact in real time.
Launched in 2015, the Soil Moisture Active Passive (SMAP) mission was built to provide the most accurate global measurements of soil moisture ever obtained from space. By orbiting at an altitude of 685 kilometers in a near-polar, sun-synchronous path, the satellite observes the entire planet every two to three days. This consistent timing—crossing the equator at 6 a.m. and 6 p.m.—is critical for minimizing environmental interference and ensuring that scientists can detect subtle changes in the ground’s condition over time.
The spacecraft originally relied on two distinct instruments: a synthetic aperture radar and a radiometer. The radar actively pulses radio waves to measure moisture even through vegetation, while the radiometer passively detects radio emissions to gauge temperature and moisture. Together, these tools allow SMAP to distinguish between frozen and thawed ground, a capability essential for understanding ecosystem productivity and the carbon cycle. While the radar experienced a failure in July 2015, the radiometer continues to operate, and NASA has explored using data from other satellites to maintain the mission's scientific objectives.
The implications of this data extend far beyond basic climate research. By mapping moisture in the top layer of soil, SMAP provides the foundational data needed to improve weather forecasts, predict the severity of droughts, and assist in flood management. For farmers and policymakers, these insights are transformative, offering a clearer picture of agricultural productivity in a changing climate. By monitoring these vital signs, NASA continues to refine our understanding of the interconnected natural systems that sustain life on Earth.
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Sources
- Summary by Intellect · source: NASA Previews New Mission to Track Water in Earth's Soil
- Also: SMAP
- Also: Soil Moisture Active Passive (SMAP) | NASA Earthdata
- Also: science.gsfc.nasa.gov — Missions & Projects - Earth Sciences Division
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