Abstract:

Objective To study the dynamic changes of the water body of rivers and Oncomelania snail habitats by using multi?temporal China?Brazil Earth Recourses Satellite?02 images taken in Anxiang County so as to establish the correct procedure for selecting images. Methods CBERS ? 02 images were collected on 20th December 2003，10th February 2004，10th April 2004，19th June 2004，10th August 2004 and 27th October 2004. Then the water body information from the study areas based on NDWI was extracted and the areas of water body were calculated to determine the images. Results The dynamic changes of the water body conformed to the rules of“water in summer and land in winter” . Because of the rise of water，the water area in July was the biggest and the water area began to decline from August. The water area in April was the smallest. Then the wet season and the dry season should be June and April. Conclusion The multi?temporal CBERS?02 images could be used to surveillance the dy? namic changes of the water area and helpful in choosing the right images of the wet season and dry season.

Key words: Oncomelania snail；China?Brazil Earth Recourses Satellite?02；Normalized difference water index；Time?series data；Environmental monitoring

摘要：

目的 探讨基于多时相中巴资源卫星02星 （CBERS?02） 数据监测钉螺孳生地水体变化的可能性。方法 收集湖南省安乡县2003?12?20、 2004?02?10、 2004?04?02、 2004?06?19、 2004?08?10和2004?10?27 6幅连续的双月间隔的CBERS?02影像， 基于归一化水体指数提取各时相河流和洲滩水体， 计算水域面积， 确定遥感时相。结果 安乡县河流和洲滩水体的动态变化基本符合 “冬陆夏水” 的规律， 6月因为涨水， 水域面积达到最大， 8月开始下降， 4月面积最小。丰水期和枯水期的遥感图像分别确定为6月和4月。结论 多时相遥感数据可以动态监测河流和洲滩水体的变化， 有助于正确选择丰水期和枯水期影像数据， 为其他研究选择遥感图像提供了方法学参考。

关键词: 钉螺； 中巴资源卫星02星； 归一化差异水体指数； 时间序列； 环境监测