摘要
鉴于GF-4在洪涝灾害领域的重要应用,为了更好地消除山体阴影和城区建筑对水体提取的影响,以GF-4的PMS传感器影像为数据源,针对其影像的高时相与水体在近红外波段高吸收的特点,提出了一种基于多时相影像在近红外波段变化方差的快速水体提取方法。以长江中下游地区的2个典型区域为研究对象,对比分析了该方法与NDWI阈值法的水体信息提取结果,并进行了精度评价。实验结果表明,该方法不仅能快速准确地提取水体信息,而且能很好地去除山体阴影和城区建筑的影响,对细小水体也有很好的提取能力,在2个区域的水体提取精度分别达到99.04%与99.37%,高于NDWI阈值法。该方法可以有效地提取水体信息,为GF-4水体提取提供技术支持。
GF-4 has an important application in the area of the flood.In this paper,a new water extraction method based on the variance of reflectance values in the near-infrared band on multi-temporal remote sensing images is proposed using the characteristics of high absorption of water in the near infrared band and high temporal resolution of GF-4 PMS images.Two typical study areas are investigated,which are selected from the area of middle-lower reaches of the Yangtze River.To evaluate the efficiency of the proposed method,the NDWI threshold method is also used in water extraction as a comparison.Then accuracy assessments are taken on the water extraction results of the two different methods.Results show that the proposed method can not only extract water information accurately,but also distinguish water,the mountain shadows and the urban buildings well and has a good ability in extracting small water bodies,with the water-extracting accuracies of the two study areas reaching 99.04%and 99.37%respectively.To sum up,the proposed method can be effectively used to extract water information of GF-4 remote sensing imagery,providing a technical support for the water extraction of GF-4 imagery.
作者
张伟
赵理君
唐娉
郑柯
ZHANG Wei;ZHAO Lijun;TANG Ping;ZHENG Ke(Institute of Remote Sensing and Digital Earth of Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《遥感信息》
CSCD
北大核心
2018年第4期108-114,共7页
Remote Sensing Information
基金
高分辨率对地观测系统重大专项(03-Y20A04-9001-15/16
11-Y20A05-9001-15/16)
