基于小波分析的河道主溜线遥感检测研究

河道主溜是河势的关键要素,是防洪决策需要及时掌握的重要信息,遥感则是快速获取河道主溜的重要途径。根据对现实河道水流中主溜表象的实际观测,分析了河道横断面上主溜区域与非主溜区域表象特征,提出了基于小波多尺度峰值分析的河道主溜检测算法,并利用黄河下游河道TM遥感影像进行了主溜检测实验,以人工查勘主溜线为真值,对检测结果进行了精度评价,验证了该算法对检测河道主溜的有效性。

Research on River Main-stream Detection with Wavelet Transform from Remote Sensing

River Main-stream is the key factor of river regime,which is a very important information for flood control decision.It is a good approach to get the main-stream information from remote sensing images in time.According to the field observation on water surface phenomena of river main-stream,water surface characteristics on main-stream and non main-stream were analyzed on river transect,and a river main-stream detection algorithm based on wavelet transform and its multi-scale peak value analysis was proposed.The proposed algorithm was verified by TM images on the lower reaches of Yellow River,and the precision was evaluated through comparing with manual-surveyed line on the same reaches,therefore the results validated that the proposed method can be used to river main-stream detection in the lower Yellow River.