基于遥感数据的东平湖面积变化监测

Monitoring for Dongping Lake Area Variation Based on Remote Sensing Data

本文以东平湖的1985、1990、1995、2002、2005、2009年的Landsat4-5卫星遥感数据为数据源,提出了波段加和法提取东平湖的水面面积。并与归一化差异水体指数(NDWI)法、改进的归一化差异水体指数(MNDWI)法和修订型水体指数(RNDWI)法计算结果进行比较,相对误差为0.68%~7.27%。波段加和法较上述的三种方法能够更加精确地提取狭窄水面,使小区域水体与其他地物的区分边界更加明显直观。同时,通过对该湖泊1985~2009年年际水面面积变化趋势分析表明,东平湖水面面积总体呈现缓慢的下降的趋势。

This paper takes the Landsat4-5 satellite remote sensing data of Dong ping Lake in 1985、1990、1995、2002、2005 and 2009 as the data source,and proposes the band addition method to extract the water surface area of Dongping Lake.The results were compared with the normalized difference water index(NDWI)method,the improved normalized difference water body index(MNDWI)method and the revised water body index(RNDWI)method.The relative error was 0.68%~7.27%.The band addition method can extract the narrow water surface more accurately than the above three methods,so that the boundary between the small area water body and other ground objects is more obvious and intuitive.At the same time,through the analysis of the trend of the annual water surface area of the lake from 1985 to 2009,the water surface area of Dongping Lake showed a slow downward trend.