湖北农业科学 ›› 2018, Vol. 57 ›› Issue (1): 51-55.doi: 10.14088/j.cnki.issn0439-8114.2018.01.013

• 资源·环境 • 上一篇    下一篇

利用Landsat影像定量评价土地盐渍化的方法探索——以瓜州-敦煌地区为例

杜婷, 焦继宗, 颉耀文, 张娟   

  1. 兰州大学资源环境学院,兰州 730000
  • 收稿日期:2017-08-15 出版日期:2018-01-10 发布日期:2020-01-02
  • 通讯作者: 颉耀文,教授,主要从事环境遥感与GIS研究,(电子信箱)xieyw@lzu.edu.cn。
  • 作者简介:杜 婷(1993-),女,河南南阳人,在读硕士研究生,研究方向为遥感与地理信息系统应用研究,(电话)15769342175(电子信箱)895983514@qq.com
  • 基金资助:
    国家自然科学基金项目(41471163)

Method Exploration for Quantitative Evaluation of Salinization Using Landsat Satellite Image:A Case Study of Guazhou-Dunhuang Area

DU Ting, JIAO Ji-zong, XIE Yao-wen, ZHANG Juan   

  1. College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China
  • Received:2017-08-15 Online:2018-01-10 Published:2020-01-02

摘要: 以2015年7月甘肃省瓜州-敦煌地区Landsat影像为研究对象,先后提取了盐碱化指数(Salinization index,SI)、修改后盐碱化指数(Modified salinization index,MSI)以及归一化植被指数(Normalized difference vegetation index,NDVI)和以二维特征空间构建新的盐渍化遥感监测指数(Modified salinization detection index,MSDI),同时利用同期野外实际考察测量数据进行适应性评价和精度验证。结果表明,指数SI容易将盐碱地和裸土地混淆,不能准确表示盐渍化程度;MSI在提取盐渍化方面具明显优势,但其仅考虑样本像元内以裸土为主的情况,忽略了像元内植被光谱信息。最后综合考虑裸土和植被信息,采用新构建的指数MSDI对该区域盐渍化进行定量化提取,结果表明MSDI指数对盐渍化提取的总体精度为86.36%,能很好反映该地区盐渍化程度。

关键词: Landsat, 遥感影像, 盐渍化, 瓜州-敦煌地区

Abstract: The Landsat image of Guazhou-Dunhuang area in Gansu province in July 2015 was taken as the research object. salinization index (SI),modified salinization index (MSI),normalized difference vegetation index (NDVI) and a new Salinization detection index(MSDI) constructed by two-dimensional feature space were extracted. At the same time,the adaptive evaluation and precision verification were carried out by using the actual field survey data. The results show that the SI is easy to confuse the saline-alkali soil and the bare land,and can’t accurately indicate the degree of salinization;MSI has obvious advantages in salinization’s extraction,but MSI only considers the case of bare soil in the sample pixel,ignores the vegetation spectral information. Finally,combined the bare soil and vegetation information,the newly constructed MSDI index was used to extract the salinization quantitatively in this area,the results show that the overall accuracy of MSDI index for salinization is 86.36%, and it is a good reflection of the degree of salinization in the area.

Key words: Landsat, remote sensing image, salinization, Guazhou-Dunhuang area

中图分类号: