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基于半分析模型的太湖春季水体漫衰减系数Kd(490)估算及其遥感反演
引用本文:刘忠华,李云梅,李瑞云,吕恒,檀静,郭宇龙.基于半分析模型的太湖春季水体漫衰减系数Kd(490)估算及其遥感反演[J].环境科学,2012,33(2):421-428.
作者姓名:刘忠华  李云梅  李瑞云  吕恒  檀静  郭宇龙
作者单位:南京师范大学虚拟地理环境教育部重点实验室,南京 210046;南京师范大学虚拟地理环境教育部重点实验室,南京 210046;南京师范大学地理科学学院地理信息系统系,南京 210046;南京师范大学虚拟地理环境教育部重点实验室,南京 210046;南京师范大学虚拟地理环境教育部重点实验室,南京 210046;南京师范大学虚拟地理环境教育部重点实验室,南京 210046
基金项目:高分辨率对地观测系统国家科技重大专项(E0203/1112/JC01);高等学校博士学科点专项科研基金项目(20093207110011);江苏高校优势学科建设工程项目(1411109012)
摘    要:漫衰减系数是水体重要的光学参数,是水生态系统的重要影响因素.利用2009年4月和2010年5月太湖实测数据,基于光学闭合原理,首先求解出490 nm处水体总的吸收系数a(490)]和后向散射系数bb(490)],进而研究了其与模拟的环境一号卫星多光谱数据不同波段遥感反射率之间的关系,在此基础上构建了太湖春季水体Kd(490)反演的半分析模型并将其应用到环境一号卫星影像上进行了太湖春季水体Kd(490)的遥感反演.结果表明,①基于光学闭合原理,可以较为准确地求解出a(490)和bb(490),a(490)实测值与求解值的平均相对误差为17.1%,bb(490)与模拟的环境一号卫星第四波段的遥感反射率具有很好的指数关系;②本研究所构建的模型具有较好的精度和稳定性,利用与卫星影像准同步的地面采样点对模型进行验证,得出模型反演的平均相对误差为21.6%,均方根误差为1.68 m-1;③太湖春季水体Kd(490)具有较强的空间差异性,太湖北部和东太湖大部分区域为Kd(490)的低值区,太湖西部和南部为Kd(490)的高值区,而太湖中部大部分区域介于两者之间.

关 键 词:漫衰减系数  半分析模型  环境一号卫星  光学闭合  太湖
修稿时间:5/9/2011 12:00:00 AM

Estimation and Remote Sensing Inversion of Diffuse Attenuation Coefficient Kd(490) in Lake Taihu in Spring Based on Semi-analytical Model
LIU Zhong-hu,LI Yun-mei,LI Rui-yun,LV Heng,TAN Jing and GUO Yu-long.Estimation and Remote Sensing Inversion of Diffuse Attenuation Coefficient Kd(490) in Lake Taihu in Spring Based on Semi-analytical Model[J].Chinese Journal of Environmental Science,2012,33(2):421-428.
Authors:LIU Zhong-hu  LI Yun-mei  LI Rui-yun  LV Heng  TAN Jing and GUO Yu-long
Institution:Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China;Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China;Department of Geographical Information System, School of Geographic Science, Nanjing Normal University, Nanjing 210046, China;Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China;Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China;Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, China
Abstract:Diffuse attenuation coefficient is not only an important optical parameter, but also an important factor of water ecological system. Two datasets measured in April 2009 and May 2010 were firstly used to calculate absorption coefficient a(490)] and backscattering coefficient bb(490)] at 490 nm, and then, the relationship between bb(490) and simulated remote sensing reflectance at different bands of HJ-1 was studied. The semi-analytical model of Kd(490)in Lake Taihu in spring was constructed based on this basis, and it was used to estimate Kd(490) of Lake Taihu via an image of HJ-1 finally. The results show that: 1 The values of a(490) and bb(490) can be calculated accurately based on optical closure principle, and the mean absolute percent error (MAPE) of a(490) between calculated and measured is 17.1%. In addition, the backscattering coefficient at 490 nm bb(490)] exponentially relate with the simulated remote sensing reflectance at the fourth band of HJ-1; 2 The semi-analytical model constructed in this study has good accuracy and stability. The MAPE is 21.6% and RMSE is 1.68 m-1 by comparing inversion result and quasi-synchronous measured data; 3Kd(490) of Lake Taihu in spring differs a lot in space distribution. The values are relatively smaller in north and east part of Lake Taihu, but larger in west and south part.
Keywords:diffuse attenuation coefficient  semi-analytical model  HJ-1 satellite  optical closure  Lake Taihu
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