研究目的
To investigate the backscatter sensitivity of Sentinel-1 (S-1) C-band (5.4 GHz) to water stored in the canopy.
研究成果
Seasonal changes in vegetation had larger effects in the C-band backscatter signal for the Douglas-fir plot than from a beech plot. Rainfall intercepted in a Douglas-fir canopy causes an increase in σ° at the C-band, more evident for VH polarization. The effects of rainfall in the beech canopy were not representative. The spatial information of wetness can be mapped at high spatial resolution, but with limitations in accuracy.
研究不足
The sensitivity to rainwater storage is limited to an error of 50% in retrieved wetness, and the method is best suited for canopies with large storage capacity.
1：Experimental Design and Method Selection:
The study used time series of S-1 images acquired over two types of nearby mature forest (Douglas-fir and beech). The methodology involved calibrating S-1A/B scenes, analyzing their seasonality, classifying images as wet or dry based on meteorological information, and comparing variations in S-1A/B backscattering coefficients (σ°) averaged over the two forest plots for wet and dry conditions.
2：Sample Selection and Data Sources:
Two forest plots in the Netherlands were selected, and hourly precipitation data was obtained from a nearby weather station.
3：List of Experimental Equipment and Materials:
Sentinel-1A and S-1B scenes, Sentinel-1 Toolbox from SNAP for image processing.
4：Experimental Procedures and Operational Workflow:
Images were calibrated, geocoded, and subsetted. A Lee speckle filter was applied, and σ° were obtained in dB.
5：Data Analysis Methods:
The mean backscattering coefficient was determined for each plot, and images were classified as wet or dry based on rainfall data.
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