面向对象的GF-2影像水体信息提取研究
2021-07-08王冬梅陈琳冯峰
王冬梅 陈琳 冯峰



摘 要:高分辨率遥感影像面向对象信息提取的前提和关键步骤是影像分割。在分析水体信息提取方法的基础上,提出多尺度-光谱差异分割的方法。首先,以河南省开封市某区域为例,采用多尺度分割的方法对GF-2影像进行分割,确定最优分割尺度;然后,在保证地类分割纯度的基础上,对分割的影像进行光谱差异分割,得到研究区域水体分割最佳效果;最后,利用水体在近红外波段均值的特征,设置阈值提取到满意的水体信息结果。根据目视评价和定量评价结果,证明该方法在研究区域是可行的。
关键词:面向对象;GF-2影像;多尺度-光谱差异分割;水体信息提取
中图分类号:TV213.4;TP75 文献标志码:A
doi:10.3969/j.issn.1000-1379.2021.05.015
Abstract: The prerequisites and key step of object-oriented information extraction high-resolution remote sensing image is image segmentation. Based on the analysis of previous water information extraction methods, a new multiscale-spectral differential segmentation method was proposed. Firstly, taking an area in Kaifeng City of Henan Province as an example, the multi-scale segmentation method was used to segment the GF-2 image and determine the optimal segmentation scale; then, on the basis of ensuring the purity of land-cover category segmentation, the spectral differential segmentation was performed on the segmented images to obtain the best effect of water segmentation in the study area; finally, according to the characteristics of the mean value of water in the near-infrared band, a threshold value was set to extract the satisfactory water information results. Based on the visual and quantitative evaluation, the proposed method is proved to be feasible in the study area.
Key words: object-oriented method; GF-2 image; multiscale-spectral differential segmentation; water information extraction
水是人類和一切生物赖以生存和发展的物质基础。人口数量大幅度增长、社会经济快速发展、水资源分布不平衡,导致全球性的水资源短缺和水环境污染,极大地影响着社会的发展。采取科学、准确、快速的方法对水资源水环境进行监测,适时掌握水资源水环境的变化信息,进而采取相应的措施,是水资源水环境有效利用、合理规划和保护的关键。传统的水体信息提取是通过野外测量的方式获取,费时费力,不适合对水体信息及时获取和实时监测。随着遥感影像空间分辨率的提高,遥感影像的应用越来越广泛。利用高分辨率遥感影像快速提取水体信息已成为水资源水环境动态监测的重要手段。
利用遥感影像提取水体信息的方法可分为基于像元和面向对象两大类。……
