基于InSAR相干系数的河湖岸线水事活动监测

Monitoring Water Matter Activity of River and Lake Shoreline Based on Coherent Coefficient

及时发现河湖岸线水事活动对监管河湖岸线、维护河湖健康具有重要意义。选取黄河小北干流4期Radarsat-2遥感影像形成2期干涉像对,对干涉数据进行数据预处理生成相干系数图。利用地物的干涉相干特性,采用差值阈值法获取河湖岸线水事活动疑似“热点”图斑,以同期高分辨率可见光遥感影像为验证数据对结果进行验证和分析。结果表明,基于相干系数变化可以成功发现河道临河房屋建设、堆放、占用等水事活动,利用该方法进行河道水事活动监测是可行的。

Water matter activity monitoring is of great significance for river and lake shoreline supervision and maintenance of river and lake health.Four radarsat⁃2 remote sensing images of Xiaobeiganliu reach of the Yellow River were chosen to form phase 2 interference image pairs.Coherence coefficient difference maps were generated through data preprocessing of the interference images.Based on the coherence characteristics of the ground object in InSAR images,the suspected“hot spot”pattern of water matter activity in the river and lake shoreline were obtained by the threshold method.The monitoring results were verified by the high⁃resolution visible remote sensing image of the same period.The results show that the methods based on the change of coherence coefficient is feasible and effective to find water matter activity of river and lake shoreline such as house construction,stacking and occupation.