基于简单比值型水体指数(SRWI)的水体信息提取研究
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摘要
以闽江口Landsat TM影像为研究对象,通过研究水体及其背景地物光谱特征,根据水体在绿光波段(TM2)的亮度值高于中红外波段(TM5),而水体背景地物在绿光波段(TM2)亮度值低于中红外波段(TM5)的特点,提出了简单比值型水体指数(SRWI).该指数中的水体与其背景地物具有较好的可分性,将本依据应用用于不同类型的水体提取上,均取得了良好的效果.实验表明SRWI方法适用于多源遥感数据的水体提取,且操作简单方便,对水体信息快速提取有较强的应用意义.
Using Landsat TM imagery of Minjiang River Estuary as a research object,a simple ratio of water index( SRWI) has been proposed in this paper through the analysis of the difference of spectral features between water body and other background features,and the features that the DN value of water in GREEN( TM2) is higher than in MIR( TM5),while the DN value of backgrounds of water in GREEN( TM2) is lower than in MIR( TM5). SRWI can tell water from backgrounds well and when tested in the abstraction of different kinds of water,it achieved excellent results. Experiments indicate that SRWI can well adapted to the extraction of water body of Multisource remote sensing data. SRWI is simple and easy to use and has strong application significance to quick extraction of water body.
Using Landsat TM imagery of Minjiang River Estuary as a research object,a simple ratio of water index( SRWI) has been proposed in this paper through the analysis of the difference of spectral features between water body and other background features,and the features that the DN value of water in GREEN( TM2) is higher than in MIR( TM5),while the DN value of backgrounds of water in GREEN( TM2) is lower than in MIR( TM5). SRWI can tell water from backgrounds well and when tested in the abstraction of different kinds of water,it achieved excellent results. Experiments indicate that SRWI can well adapted to the extraction of water body of Multisource remote sensing data. SRWI is simple and easy to use and has strong application significance to quick extraction of water body.
引文
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[15]杨存建,徐美.遥感信息机理的水体提取方法的探讨[J].地理研究,1998,17(增刊):86-89.
[2]闫霈,张友静,张元,等.利用增强型水体指数(EWI)和GIS去噪音技术提取半干旱地区水系信息的研究[J].遥感应用,2007(6):62-67.
[3]陆家驹,李士鸿.TM资料水体识别技术的改进[J].环境遥感,1992,7(1):17-23.
[4]杜云艳,周成虎.水体的遥感信息自动提取方法[J].遥感学报,1998,2(4):264-269.
[5]都金康,黄永胜,冯学智,等.SPOT卫星影像的水体提取方法及分类研究[J].遥感学报,2001,5(3):214-219.
[6]McFeeters S K.The use of normalized difference water index(NDWI)in the delineation of open water features[J].International Journal of Remote Sensing,1996,17(7):1425-1432.
[7]徐涵秋.利用改进的归一化差异水体指数(MNDWI)提取水体信息的研究[J].遥感学报,2005,9(5):589-595.
[8]丁凤.基于新型水体指数(NWI)进行水体信息提取的实验研究[J].测绘科学,2009,34(4):155-157.
[9]梅安新,彭望碌,秦齐明,等.遥感导论[M].北京:高等教育出版社,2001.
[10]Jensen J R.Introductory digital image processing:a remote sensing perspective[M].NJ:Prentice Hall Logicon Geodynamics,Inc,1996.
[11]李畅游,于瑞红,王丽,等.乌梁素海遥感影像的水体提取方法与分析[J].内蒙古农业大学学报:自然科学版,2004,25(1):1-4.
[12]肖艳芳,赵文吉,朱琳.利用TM影像Band1与Band7提取水体信息[J].测绘科学,2010,35(5):226-227.
[13]朱峰,邹辉培,李传荣.基于TM遥感图像的水体提取[C]∥第十三届华东六省一市测绘学会学术交流会论文集,2011:129-132.
[14]钟春棋,曾从盛,柳铮铮.基于谱间特征与比值型指数的水体影像识别分析[J].地球信息科学,2008,10(5):663-668.
[15]杨存建,徐美.遥感信息机理的水体提取方法的探讨[J].地理研究,1998,17(增刊):86-89.