近30年上海大陆海岸线的遥感提取及变迁分析

Extraction and Change Detection of Shanghai Continental Coastline Using RS Imagery in Recent 30 Years

以上海海岸带为研究区域,以1985~2015年的Landsat系列影像为数据来源,提出了一种关于海岸线遥感提取的新思路。结合面向对象影像分割、闽值选取、边缘检测和潮位校正等过程,分幅提取了研究区7个年份的海岸线。同时分析了近30年来上海海岸线的变迁规律。结果表明,受自然和人为两方面因素的影响,上海海岸线的变迁整体表现为岸线外推、海岸淤涨。海岸线的总长度表现为上升态势:从1985年的176.54 km到2015年的189.77 km,新增的岸线长度为13.23km。该研究成果揭示了上海海岸带的发展进程,为人们进一步提取和分析上海海岸带的土地利用变化规律提供了数据基础和参考价值。

Taking Shanghai coast zone as the study area and using the 1985-2015 landsat images as the data source, a new method for coastline extraction is proposed. By incorporating the processes such as object-oriented image segmentation, threshold selecting, edge detection and tide correction, the coastline within the study area over seven years is extracted frame by frame. The change rule of the coastline in Shanghai in recent thirty years is analyzed. The result shows that the change of the coastline in Shanghai is affected by both natural and human factors. The total change of the coastline in Shanghai appears as coastline outward extension and silt at ion. The total length of the coastline exhibits the trend of rising.The coastline increases from 176.54 km in 1985 to 189.77 km in 2015. The length of the new added coastline is 13.23 km. This research result reveals the developing process of Shanghai coast zone. It lays a basis for the further extraction and analysis of the change rule of land use in Shanghai coast zone.