|
|||||
|
|
| 一种计算水体中悬浮物后向散射系数的方法 | |
| 引用本文： | 李俊生,张兵,张霞,申茜,张运林.一种计算水体中悬浮物后向散射系数的方法[J].遥感学报,2008,12(2):193-198. |
| 作者姓名： | 李俊生 张兵 张霞 申茜 张运林 |
| 作者单位： | 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;中国科学院,研究生院,北京,100039 2. 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 3. 中国科学院,南京地理与湖泊研究所,江苏,南京,210008 |
| 基金项目： | 中国科学院基金 , 中国科学院知识创新工程项目 |
| 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. |
| 关 键 词： | 生物光学模型 分析方法 后向散射系数 悬浮物 计算 水体 悬浮物 散射系数 方法 Water Suspended Matter Coefficients 数据基础 实施 数据比较 使用 通用性 测量精度 理论 优势 效果 数据检验 试验区 太湖梅梁湾 |
| 文章编号： | 1007-4619(2008)02-0193-06 |
| 修稿时间： | 2006年8月24日 |
A Method of Calculating Back-scattering Coefficients of Suspended Matter in Water |
|
| LI Jun-sheng,ZHANG Bing,ZHANG Xi,SHEN Qian and ZHANG Yun-lin.A Method of Calculating Back-scattering Coefficients of Suspended Matter in Water[J].Journal of Remote Sensing,2008,12(2):193-198. | |
| Authors: | LI Jun-sheng ZHANG Bing ZHANG Xi SHEN Qian and ZHANG Yun-lin |
| Institution: | State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China;Graduate School of Chinese Acade my of Sciences, Beijing 100039, China;State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China;State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China;State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China;Graduate School of Chinese Acade my of Sciences, Beijing 100039, China;Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Jiangsu Nanjing 210008, China |
| Abstract: | Analytical algorithm, which is based on bio-opticalmode,l represents the trends of algorithms in retrieving water quality parameters from remote sensing data. In analytical algorithm, inherentopticalproperties, including absorp- tion coefficients and back-scattering coefficients ofeach componentofwater, are mi portant inputparameters. The absorp- tion coefficients of each componentofwater can bemeasured easily in laboratory. On the other hand, themeasuring of back-scattering coefficients of suspendedmatter inwater is alwaysdifficult, especially for inlandwaters. There aremainly three kinds ofmethods inmeasuring back-scattering coefficients ofsuspendedmatter: (1) measuring in fieldwith specific instruments; (2) collectingwater samples in field, measuring the scattering phase functions of thewater samples in labo- ratory, and then calculating the back-scattering coefficients based on the scattering phase functions; (3) collectingwater samples in field, measuring the total absorption coefficients and beam attenuation coefficients of the water samples, and then calculating the back-scattering coefficientsby substracting the totalabsorption coefficients from beam attenuation coef- ficients, and thenmultiplying ratio ofback-scattering coefficients of suspendedmatter. However, all these threemethods have some drawbacks: (1) thesemethods aremainly designed foroceanwaters, andmaynotbe suitable for inlandwaters due to the greatdifferences in opticalpropertiesbetween them; (2) the scattering phase functionmeasuring instrument is hard to be designed and installed, and there are few such instruments in China; (3) the ratio ofback-scattering coeffi- cients ofsuspendedmatter, which is difficult tomeasure, has to be estmi ated in calculating back-scattering coefficients of suspendedmatter, and the estmi ationwill lead to some errors. In this paper, a newmethod of calculating back-scattering coefficients of suspendedmatter is put forward. Based on bio-opticalmode,l thismethod uses thewater surface reflectance spectra data and absorption coefficients ofwater compo- nents to retrieve back-scattering coefficients of suspended matter. Validated by data acquired from Meiliang Bay, Taihu Lake, thismethod shows advantages as follows: (1) based on bio-opticalmode,l ithas sound theoreticalbasis; (2) it is easy to be carried out because the data used in thismethod are easy to obtain. Provided the above advantages, data of back-scattering coefficients of suspendedmatter can be acquired for the application in the future. |
| Keywords: | bio-opticalmode lanalytical algorithm back-scaterring coefficient suspendedmatter |
| 本文献已被 万方数据 等数据库收录！ | |
| 点击此处可从《遥感学报》浏览原始摘要信息 | |
| 点击此处可从《遥感学报》下载免费的PDF全文 | |