渭河干流杨凌段水边线提取及其分维数计算方法研究  

Waterline extraction and fractal dimension calculation method of Yangling Section of Weihe River main stream

作　　者：夏积德[1,2] 江仕荣 周波[1] XIA Jide;JIANG Shirong;ZHOU Bo(Yangling Vocational and Technical College,Yangling 712100,China;Northwest A&F University,Yangling 712100,China)

机构地区：[1]杨凌职业技术学院,陕西杨凌712100 [2]西北农林科技大学,陕西杨凌712100

出　　处：《水资源与水工程学报》2019年第6期45-49,共5页Journal of Water Resources and Water Engineering

基　　金：陕西省水利厅科技项目(2017S1kj-11);陕西省科技厅项目(2016NY-091)

摘　　要：利用RGB遥感影像和DEM数据,采用Sobel算子法、人工交互阈值分割法、DEM河网法和面向对象分类法提取渭河干流杨凌段水边线信息和分维数计算。结果表明:不同方法所提取的水边线的盒分维方程的判定系数差别不明显,且具有良好的提取效果;当数据精度较高,研究面积较小时,人工交互阈值分割法具有较高的提取精度,高分辨率RGB遥感影像也能用于提取水边线信息;研究区河流分维数在1.0~1.4之间,属于侵蚀发育阶段的幼年期;文中4种方法提取水边线均可行,在缺乏高精度DEM数据的情况下,采用RGB遥感影像也可以较好地提取水边线信息。The RGB remote sensing images and DEM data were used,and the Sobel operator method,artificial interactive threshold segmentation method,DEM river network method and object-oriented classification method were adopted to extract waterline information and calculate fractal dimension of Yangling Section of the main stream of Weihe River.The results showed that the coefficient difference of the fractal dimension equation of the waterline extracted by different methods is not obvious,and their extraction effect was good The artificial interaction threshold segmentation method has a relatively higher extraction precision,and the high-resolution RGB remote sensing image can be safely used for the waterline information extraction.The fractal dimension of the study area was between 1.0 and 1.4,which means the Yangling main stream is at the infancy of the erosion development.The four methods tested in this paper were all feasible to extract waterline.With the absence of high-precision DEM data,an RGB remote sensing image can also be used to extract waterline information.

关 键 词：分形几何 水边线提取 计盒分维 渭河干流杨凌段 

分 类 号：TV82[水利工程—水利水电工程]