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Suggested Citation:"SMAP, Soil Moisture Active-Passive ." National Research Council. 2008. Satellite Observations to Benefit Science and Society: Recommended Missions for the Next Decade. Washington, DC: The National Academies Press. doi: 10.17226/11952.
Page 23

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Earth Science and Applications from Space 23 SMAP Soil Moisture Active-Passive Launch : 2010–2013 Mission size: Medium Orbit: LEO, SSO Agency: NASA Estimated cost: $300 million Areas of interest: Health, Water Instruments: L-band radar, L-band radiometer Benefits: More accurate weather and climate forecasts, especially over interior continental areas Improved early warning and decision support for droughts Better predictions of agricultural productivity Improved flood forecasts, especially in the developing world Although soil moisture strongly affects plant growth and the evolu- tion of both weather and climate, there is no global network to measure it. When accurate readings of soil moisture are fed into weather and climate models, the forecast quality improves and longer lead times become possible. Soil moisture is one of the leading factors in flood and landslide risk, and it also plays an important role in the global carbon cycle through its effects on plant growth. Many field studies have shown that microwave radars provide useful data on soil moisture. SMAP combines an active radar with a passive radi- ometer, allowing soil moisture to be measured and analyzed globally at a resolution of 3 to 10 kilometers every 2 to 3 days. The results will help Earth scientists to better represent the water, energy, and carbon cycles in global models of weather and climate. Significant advances in long-range weather and seasonal forecasting will become possi- ble, and the data will help build a new generation of hydrologic models for predicting and studying floods and droughts.

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Satellite Observations to Benefit Science and Society: Recommended Missions for the Next Decade Get This Book
 Satellite Observations to Benefit Science and Society: Recommended Missions for the Next Decade
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Satellite Observations to Benefit Science and Society: Recommended Missions for the Next Decade brings the next ten years into focus for the Earth and environmental science community with a prioritized agenda of space programs, missions, and supporting activities that will best serve scientists in the next decade. These missions will address a broad range of societal needs, such as more reliable weather forecasts, early earthquake warnings, and improved pollution management, benefiting both scientific discovery and the health and well-being of society.

Based on the 2007 book, Earth Science and Applications from Space: National Imperatives for the Next Decade and Beyond, this book explores each of the seventeen recommended missions in detail, identifying launch dates, responsible agencies, estimated cost, scientific and public benefits, and more. Printed entirely in color, the book features rich photographs and illustrations, tables, and graphs that will keep the attention of scientists and non-scientists alike.


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