基于决策树与密度聚类的高分辨率影像海岸线提取方法

发布时间：2018-01-11 21:37

本文关键词：基于决策树与密度聚类的高分辨率影像海岸线提取方法　出处：《海洋环境科学》2017年04期 　论文类型：期刊论文

【摘要】：针对高分辨率影像进行海岸线提取时常常出现的河道区域岸线向陆地方向伸向较远的问题,本文将海岸线视为海水(包括潮滩)与陆地(包括河流)两类地物的分界线进行提取。首先采用C4.5决策树分类方法进行海岸带地物分类规则挖掘,实现基于规则的地物分类;再对海水与陆地分类结果进行基于密度的聚类方法进行后处理,实现噪声去除,其基本原理为:设置一邻域半径,通过统计半径内异类样本点的数量来确定当前点是否为噪声点,若异类像素点的个数超过某一预设的阈值,则对当前噪声点进行修正。为验证本文提出方法的有效性,获取了2013年10月20日天津附近海岸带区域的资源三号卫星影像数据进行验证,结果表明,本文提出的岸线提取方法能够消除河道区域岸线提取的影响,除个别地物比较复杂的区域之外,其平均提取精度优于2个像元,满足海域遥感技术规程中线状信息误差标准的要求。
[Abstract]:In the process of shoreline extraction from high-resolution images, the problem of channel regional shoreline extending to land is often encountered. In this paper, shoreline is regarded as the boundary line between sea water (including tidal flat) and land (including river). Firstly, C4.5 decision tree classification method is used to mine coastal features classification rules. Realization of rule-based feature classification; Then the classification results of seawater and land are processed by density-based clustering method to achieve noise removal. The basic principle is to set a neighborhood radius. By counting the number of heterogeneous sample points in the radius to determine whether the current point is a noise point, if the number of different pixel points exceeds a preset threshold. In order to verify the effectiveness of the proposed method, the satellite image data of resource 3 in the coastal zone area near Tianjin on October 20th 2013 are obtained and verified. The results show that the proposed method is effective. The method of shoreline extraction proposed in this paper can eliminate the influence of shoreline extraction in river area. The average extraction accuracy of the method is better than that of two pixels except for some complicated areas. Meet the requirements of the standard of linear information error in the remote sensing technical specification of the sea area.
【作者单位】：青岛大学数据科学与软件工程学院;国家海洋环境监测中心;国家海洋局海域管理技术重点实验室;
【基金】：国家自然科学基金(41506198) 国家海洋局国家海域管理技术重点实验室开放基金项目(201205) 海域使用动态监测和污染监测研究专项(Y30B12-9001-14/16) 青岛市科技发展计划(13-1-4-121-jch,13-1-4-156-jch)
【分类号】：P715.7
【正文快照】： 海岸线定义为平均大潮高潮时的海陆分界线[1]。我国海岸线全长约为3.2万km,其中大陆海岸线长约1.8万km,岛屿海岸线长约1.4万km。如何可靠、准确、实时的监测海岸线的变化并测定其位置,对我国国家安全战略、沿海地区的经济建设、海洋生态保护、可持续发展等具有十分重要的意义

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