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目的利用卫星遥感技术对长江南京段洲滩钉螺孳生地进行监测研究。方法收集复盖长江南京段区域的LandsatMSS遥感片和1980～1989年江苏省钉螺面积数，比较分析钉螺面积的变化趋势。以ERDASImaging支撑软件分析遥感片，将LandsatMSS4个波段的数据以“TasseledCap”主成份分析模型分类组合成3个波段和15类后，提取出湿地地物特征。结果收集到1983年和1994年3个时段共三辐LandsatMSS遥感图。3个时段的湿地空间分布模型反映了特大洪水位与丰水位间、丰水位与枯水位间的湿地变化，从而得出钉螺孳生地分布与钉螺扩散的二个空间模型。并且在遥感图像中可直接正确地测算出钉螺孳生地分布面积数和钉螺扩散潜在面积数。长江南岸和北岸因决堤洪水淹没的二大区域在1983年的遥感片上清晰地显示出来。江苏省1980～1989年江滩钉螺面积与全省有螺面积变化呈一致的指数曲线上升趋势，但以1983年特大洪水后有螺面积上升非常明显。结论这一技术为研究钉螺孳生地和钉螺扩散范围、预测下一年度钉螺面积提供新方法。
Aim To use satellite remote sensing technology to monitor the snail breeding sites in Duanzhou Beach, Nanjing Changjiang River. Methods The Landsat MSS remote sensing film covering the Nanjing section of the Yangtze River and the area of snails in Jiangsu province from 1980 to 1989 were collected to analyze the changing trend of snail area. The remote sensing slices were analyzed by ERDASImaging software and the data of 4 bands of LandsatMSS were classified into 3 bands and 15 categories according to the “TasseledCap” principal component analysis model to extract the features of wetland features. Results Three Landsat MSS remote sensing images collected in 1983 and 1994 were collected. The wetland spatial distribution model of three periods reflected the wetland changes between the flood and wetlands, and the distribution of snail habitats and snail diffusion. In the remote sensing image, the area of snail breeding area and the potential area of snail spreading can be directly and correctly calculated. The two major areas inundated by floodwaters on the southern and northern banks of the Yangtze River are clearly visible on the 1983 remote sensing film. The index curve of the snail area in Jiangsu Province from 1980 to 1989 was in line with that of the snail area in Jiangsu Province. However, it was obvious that the area of snail rose after the extraordinary flood in 1983. Conclusion This technique provides a new method for predicting snail area in the next year in order to study the spread of snail habitat and snail.