【作者】 刘忠华； 李云梅； 檀静； 郭宇龙； 周莉； 刘阁；

【Author】 LIU Zhonghua;LI Yunmei;TAN Jing;GUO Yulong;ZHOU Li;LIU Ge;Key Laboratory of Virtual Geographic Environment of Education Ministry,Nanjing Normal University;

【机构】 南京师范大学虚拟地理环境教育部重点实验室；

【摘要】 总悬浮物浓度是水体重要的水质参数。本研究利用太湖春季一、秋季和巢湖夏季多期野外实测数据,通过对生物光学模型进行合理的简化构建适用于太湖、巢湖水体总悬浮物浓度反演的半分析模型,并将该模型应用于MERIS和环境一号卫星高光谱卫星影像上以验证该方法的适用性。结果表明;①针对太湖和巢湖水体,总悬浮物浓度最优反演波段范围为730~832nm(氧气吸收带除外);②针对MERIS数据,波段10(中心波长754nm)和波段12(中心波长779nm)均适用于太湖总悬浮物浓度反演,而波段11(中心波长761nm)由于氧气吸收带的影响不适用于总悬浮物浓度反演;③针对太湖MERIS数据,模型反演结果的相对误差基本上呈现出随距离卫星过境时间增大而逐渐增加的趋势,在卫星过境时间正负3小时内测量的样点,模型反演结果的相对误差均在50%以内,而时间差超过3小时,相对误差则逐渐增大到50%以上;④环境一号卫星高光谱数据17个波段(B83~B99)均能够对巢湖总悬浮物浓度进行较好的反演,其反演效果要好于MERIS数据在太湖的反演结果。更多还原

【Abstract】 Total suspended matter is an important water quality parameter.Firstly,a semi-analytical model for inversing concentration of total suspended matter was constructed by simplifying bio-optical model,using the in-situ data of Lake Taihu in spring and autumn and Lake Chaohu in summer..And then,its applicability was validated by MERIS and HJ-1 HSI data.The results show that:① The optical range for inversing total suspended matter in Lake Taihu and Chaohu is between 730 and 832 nm except oxygen absorption bands.② According to MERIS data,bands centered at 754 and 779 nm are both suitable for inversing total suspended matter in Lake Taihu except band centered at 761 nm for the influence of oxygen absorption.③According to MERIS data,the relative error of this model increases with the time difference after satellite transit time.The relative errors of inversion results of this model are below 50%when the time difference is less than 3 hours,while they increase to more than 50%when the time difference exceeds 3 hours.④Seventeen bands of HJ-1 HSI data are all suitable for inversing total suspended matter in Lake Chaohu and its result is better than that in Lake Taihu using MERIS data.更多还原