Remote Sensing of Soil Moisture Using Airborne Hyperspectral Data
NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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The Institute for Technology Development ITD has developed an airborne hyperspectral sensor system that collects electromagnetic reflectance data from the terrain. The system consists of sensors for three different sections of the electromagnetic spectrum the Ultraviolet UV, VisibleNear Infrared VNIR, and Short-Wavelength Infrared SWIR. Based upon previous research showing the value of measuring the long wavelengths of the electromagnetic spectrum when attempting to detect soil moisture, a study was conducted to further refine applications of hyperspectral data for estimating soil moisture. The SWIR sensor was used to gather data over an area in which soil moisture probes were located. We evaluated in situ soil moisture values and compared them to transformation results to correlate the transformations with field-collected values of soil moisture at specific sampling stations. An airborne hyperspectral instrument with a SWIR sensor was flown twice over the Little River Experimental Watershed in Georgia 2005 and 2007 and the results were correlated to in situ measurements of soil moisture. A significant statistical correlation R exp 2 value above 0.7 for both sampling dates for the hyperspectral instrument data and the soil moisture probe data at 5.08 cm 2 inches was determined. While models for the 20.32 cm 8 inches and 30.48 cm 12 inches depths were tested, they were not able to estimate soil moisture to the same degree.
- Geology, Geochemistry and Mineralogy
- Infrared Detection and Detectors
- Atomic and Molecular Physics and Spectroscopy