小卫星遥感影像自动提取水体方法研究

基于小卫星影像的水体信息提取方法,即用波段运算得到特征波段(PRWI),经过决策树等辅助手段提取出水体信息。通过在山东省微山湖上级坝北湖选取水体所做的试验表明,该方法在平原地区的总体提取效果较好,经检验发现其误判的像元主要是位于水体和其他地物的交界处。在山区选取山东省东周水库做的试验表明,在山区用该方法提取的小卫星水体信息和Landsat卫星的TM/ETM影像差距不大。小卫星还可以很好地用于城市规划、生态环境、土地利用和环境灾害等动态监测。

The research on the method of automatically extracting water body information from small satellite images

Extraction water information from remotely sensed is significant for surveying, planning and protecting water resources.In this paper, taking Weishan Lake as a case study area, the small satellite image collected on Jan, 2006 is used.The approach of extraction is discussed.Firstly, the special band (PRWI) is applied to extract water information.Secondly, water body information is extracted by image intensification processing and decision tree.Finally, the results are checked by visual and statistical accuracy assessment.Through indicated in the plain experiment, this method gets satisfied result.However, some pixels in the neighborhood between water bodies and mulberry are judged by mistakes.The experiment in mountainous area shows that it can get satisfied results in small satellite image and the TM/ETM image by the same method.The small satellite can be used in dynamic monitor just like urban planning, ecological environment, land utilization, environmental disaster and so on.