摘要
河流边滩是因河流沉积作用在岸边形成的沉积物,其变化可以间接反映出河流形态及其周围环境的演变。河流边滩的动态监测对于河流生态系统研究和航道管理有着非常重要的意义。针对河流边滩与部分建筑物影像光谱相似而难以区分的问题,基于Landsat影像中边滩与河流的光谱、空间和物候等多维差异化特征,提出了一种新的河流边滩提取方法,综合利用多时相水体指数的二值变化检测方法和面向对象分析方法,成功提取了赣江中下游的河流边滩。一方面丰富了河流边滩监测的方法,为地理学研究提供新的观察视角;另一方面为赣江流域生态系统建设、环境治理和航运规划管理提供更丰富的河流边滩数据。
A point bar is a sediment deposition that forms on river banks as a result of river sedimentation.Changes in point bars are regarded as an indirect response to the evolution of a river's morphology and its surrounding environment.Therefore,dynamic monitoring of point bars is significant for river-ecosystem research and shipping-lane management.It is difficult to distinguish point bars from some buildings due to the similarity of spectral characteristics.In this study,an innovative method to identify and extract point bars was proposed.This method was based on the multifarious differential characteristics such as spectrum,space,and phenology of the river and point bars in Landsat images.A binary change detection in multi-temporal water indices and an object-based image analysis were used in this method.The point bars in the middle and lower reaches of Gan river were identified and extracted by it.This method,on the one hand,enriches the methodology of monitoring point bars and provides a new perspective for the geographical study of point bars,and on the other hand,provides abundant data for the ecosystem construction,environmental management and shipping-lane planning in the Gan river basin.
作者
姜雨宏
谢相建
刘开枝
付瑞烨
谭皓
JIANG Yu-hong;XIE Xiang-jian;LIU Kai-zhi;FU Rui-ye;TAN Hao(East China University of Technology,School of Surveying and Geoinformation Engineering,Nanchang Jiangxi 330013,China;East China University of Technology,Key Laboratory of Mine Environmental Monitoring and Improving around Poyang Lake of Ministry of Natural Resources,Nanchang Jiangxi 330013,China)
出处
《现代测绘》
2024年第2期12-16,共5页
Modern Surveying and Mapping
基金
东华理工大学博士研究基金(DHBK2017156)
江西省教育厅科学技术研究项目(GJJ2200743)。
