Fig. 7From: Potential impact of flooding on schistosomiasis in Poyang Lake regions based on multi-source remote sensing imagesRisk classification of spread of Oncomelania hupensis. The NDVI values of suitable snail habitats were calculated based on snail density data, and the risk was classified as high-density, medium-density and low-density snail habitats with reference to the NDIV valuesBack to article page