一种计算水体中悬浮物后向散射系数的方法  

A Method of Calculating Back-scattering Coefficients of Suspended Matter in Water

作　　者：李俊生[1,2] 张兵[1] 张霞[1] 申茜[1,2] 张运林[3] 

机构地区：[1]中国科学院,遥感应用研究所,遥感科学国家重点实验室,北京100101 [2]中国科学院,研究生院,江苏南京210008 [3]中国科学院,南京地理与湖泊研究所

出　　处：《遥感学报》2008年第2期193-198,共6页NATIONAL REMOTE SENSING BULLETIN

基　　金：中国科学院研究生科学与社会实践项目“内陆水体固有光学量遥感反演方法研究”;中科院知识创新重要方向项目(编号:KZCX3-SW-350)

摘　　要：基于生物光学模型的水质参数反演分析方法是水质遥感监测算法的发展趋势。分析方法中需要以水体中悬浮物后向散射系数作为参数。水体中悬浮物后向散射系数目前主要有3种测量方法,但是这些方法要么因为仪器稀缺而无法普及,要么测量精度不高。提出了一种计算水体中的悬浮物后向散射系数的方法,该方法利用水面比较容易测量的反射率光谱和实验室内比较容易测量的水体各组分的吸收系数光谱,基于生物光学模型推导得出水体中的悬浮物后向散射系数。利用太湖梅梁湾试验区获取的数据检验了这种方法,并取得了较好的效果。这种方法的主要优势是:它基于生物光学模型,有严密的理论基础,具有较高的精度和通用性;另外,它使用的数据比较容易测量,方法容易实施,可为水质参数反演分析方法的建立奠定坚实的数据基础。Analytical algorithm,which is based on bio-optical model,represents the trends of algorithms in retrieving water quality parameters from remote sensing data.In analytical algorithm,inherent optical properties,including absorption coefficients and back-scattering coefficients of each component of water,are important input parameters.The absorption coefficients of each component of water can be measured easily in laboratory.On the other hand,the measuring of back-scattering coefficients of suspended matter in water is always difficult,especially for inland waters.There are mainly three kinds of methods in measuring back-scattering coefficients of suspended matter:(1) measuring in field with specific instruments;(2) collecting water samples in field,measuring the scattering phase functions of the water samples in laboratory,and then calculating the back-scattering coefficients based on the scattering phase functions;(3) collecting water samples in field,measuring the total absorption coefficients and beam attenuation coefficients of the water samples,and then calculating the back-scattering coefficients by substracting the total absorption coefficients from beam attenuation coefficients,and then multiplying ratio of back-scattering coefficients of suspended matter.However,all these three methods have some drawbacks:(1) these methods are mainly designed for ocean waters,and may not be suitable for inland waters due to the great differences in optical properties between them;(2) the scattering phase function measuring instrument is hard to be designed and installed,and there are few such instruments in China;(3) the ratio of back-scattering coefficients of suspended matter,which is difficult to measure,has to be estimated in calculating back-scattering coefficients of suspended matter,and the estimation will lead to some errors.In this paper,a new method of calculating back-scattering coefficients of suspended matter is put forward.Based on bio-optical model,this method uses the water surface reflectance spectra data

关 键 词：生物光学模型 分析方法 后向散射系数 悬浮物 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]