Fine-Resolution Measurement of Soil and Vegetation Moisture using InSAR Closure Phase
Fine-Resolution Measurement of Soil and Vegetation Moisture using InSAR Closure Phase
by Elizabeth Wig
Stanford University
Soil and vegetation moisture can vary spatially at the scale of agricultural fields or landscape features. Active radar provides a finer resolution than most radiometer systems; the amplitude of active radar has been used to measure soil moisture. The phase of active radar is relatively underutilized in moisture measurements. In this talk, I’ll discuss how phase measurements from active radar can be used to detect changing soil and vegetation moisture.
InSAR (interferometric synthetic aperture radar) measures a difference in phase between two radar scenes taken at different times to generate an interferogram. By calculating the phase around a loop of InSAR interferograms, we find a signal we call the closure phase. The closure phase is sensitive to changes in moisture, both in the soil and in vegetation. Here, we show that we can use InSAR closure phase from Sentinel-1 to measure changing soil and vegetation moisture over forests in the northeastern US. The closure phase signal is dominated by soil moisture changes in some areas and vegetation changes in others, or can be produced by a combination of the two. Whether measuring soil or vegetation, InSAR closure phase is a promising new method to measure changing moisture in radar images.
Webinar sponsored by IEEE GRSS IFT-TC
5 September 2024
More details at: https://www.grss-ieee.org/events/fine...
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