Fig. 4From: Potential impact of flooding on schistosomiasis in Poyang Lake regions based on multi-source remote sensing imagesThe histogram of scattering values of SAR radar images for waterbody extractions. a An image captured on 15 May 2020, b an image captured on 14 July 2020. There are two apparent peaks in the histograms of the images, and the thresholds for segmented SAR images were − 25.5 and − 24 dB before and after flooding, respectivelyBack to article page