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Space-borne Passive Microwave Remote Sensing of Soil Moisture: A Review

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Soil moisture (SM) plays an important role in groundwater recharge, runoff, air moisture, atmospheric temperature, land degradation, geo-chemical process, surface and sub-surface biota including agriculture, etc. Several studies have reported comparable results of space-borne passive microwaves remote sensing of surface (2 to 5 cm) SM using relationship between volumetric SM and brightness temperature, dielectric constant, polarimetry, roughness parameter, mathematical inferences, etc. However, reported success studies are very site-, image -, overpass time-, model- and situation specific and insufficient to reach at global conclusions. Therefore, reported methods, techniques and algorithms should thoroughly be tested in different biophysical environments to assess applicability in SM retrievals using microwave data captured at different frequencies, polarization, angle, time, etc.
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Keywords: Calibrations; dielectric properties; enhancements; frequency; models; passive microwave; polarimetry; radiometry; remote sensing

Document Type: Research Article

Publication date: December 1, 2014

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  • Recent Patents on Space Technology publishes review/research articles, and guest edited thematic issues on recent patents in the field of Space Technology. A selection of important and recent patents on Space Technology is also included in the journal. The journal is essential reading for all researchers involved in the fields of Space Technology. Research areas covered by the Journal are: Space exploration , Space colonization, telemetry, satellite television, weather forecasting, Global Positioning System (GPS), Satellite, Asteroid mining, Spacecraft and Aerobot.
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