摘要
长江中下游流域在我国有着重要的地理定位,是长江经济带建设发展的重要组成部分。江心洲的演变对于湿地保护、航道安全等具有较好的参考价值,而洲上的植被动态变化对于河流生态系统功能和相关生态系统服务也至关重要。本文利用1987-2020年的Landsat影像数据,运用ArcGIS软件通过波段合成、改进归一化差异水体指数法和面向对象的分类方法,得到长江中下游流域近30年江心洲形态及部分洲上植被分类矢量数据集,并利用高时空分辨率的影像与之对比验证该数据的准确性和可靠性。本数据集可用于长江中下游流域江心洲演变分析、与环境因子的影响分析、景观格局变化研究等。
As an important geographical position in China,the middle and lower reaches of the Yangtze River play an important role in the construction and development of the Yangtze River Economic Belt.The evolution of mid-channel bar(MCB)has a good reference value for wetland protection and waterway safety,and the dynamic changes of vegetation on the continent are also crucial for river ecosystem functions and related ecosystem services.In this paper,based on the Landsat image data from 1987 to 2020,we used the Arc GIS software to synthesize the bands and improved the normalized differential water index method and the object-oriented classification method,so as to obtain the forms of MCB and some vegetation classification vectors on the continents in the middle and lower reaches of the Yangtze River in the past 30 years.In addition,we compared the data with high spatial resolution images to verify the accuracy and reliability of the data.This dataset can be used for analysis of the evolution of MCB in the middle and lower reaches of the Yangtze River,analysis of the impact of environmental factors,and research on landscape pattern changes.
作者
周旭
温兆飞
ZHOU Xu;WEN Zhaofei(College of Architecture and Urban Planning,Chongqing Jiaotong University,Chongqing 400074,P.R.China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,P.R.China;Chongqing School,University of Chinese Academy of Sciences,Chongqing 400714,P.R.China)
基金
国家自然科学基金(41501096、51779241)。
关键词
长江中下游
江心洲
植被
LANDSAT
the middle and lower reaches of the Yangtze River
mid-channel bars
vegetation
Landsat
