基于Canny算子的南通江海岸线研究

Study on Nantong coastlines based on Canny operator

基于RS、GIS、Matlab等技术与平台提取遥感影像岸线是当前实现海岸动态监测和分析各类型海岸动力地貌演化的重要技术方法。本文选取江苏南通江海岸带为研究区,对多期预处理后的MSS、TM和OLI影像进行卷积滤波、图像分割等处理;然后使用Matlab,基于Canny算子检测图像边缘,提取了多期影像的瞬时水边线。与此同时,结合不同类型海岸目视解译标志和吕四港近5 a潮汐数据矫正提取瞬时水边线,最后提取南通市4期江海岸线并分析了近45 a来南通江海岸线演变特性。

Based on RS,GIS,Matlab and other platforms,the extraction of shoreline from remote sensing images is an important technical method to realize dynamic monitoring and analysis of various types of coastal dynamic geomorphological evolution.In this study,the coastal zone of Nantong,Jiangsu province is selected as the research area.Based on RS platform,the images of MSS,TM and OLI after multi-stage preprocessing are processed by convolution filtering and image segmentation.Then,using Canny operator to detect the image edge and extract the instantaneous water line of these multi-stage images.At the same time,the instantaneous water boundary is extracted combining with different types of coastal visual interpretation signs and tidal data correction over the past five years in Lvsi Port.Based on GIS platform,this study finally extracts four times coastlines and analyses the erosion and deposit evolution of them in recent 45 years in Nantong.