基于Hydrolight模型的太湖SDGSAT-1卫星悬浮物浓度反演研究
Research on Suspended Matter Concentration Retrieval of SDGSAT-1 Satellite in Lake Taihu Based on Hydrolight Model
王雅萍 1胡雪可 2李家国 3姜晟 4陈兴峰 3赵利民 3陈洪真3
作者信息
- 1. 河南理工大学测绘与国土信息工程学院,焦作 454000
- 2. 河南理工大学测绘与国土信息工程学院,焦作 454000;中国科学院空天信息创新研究院,北京 100094
- 3. 中国科学院空天信息创新研究院,北京 100094
- 4. 江苏省环境监测中心,南京 210019
- 折叠
摘要
利用卫星遥感反演水体中的悬浮物浓度对水质监测和保护具有重要意义,在悬浮物浓度反演过程中,如何避免或最大程度降低水体中叶绿素a、有色可溶性有机物(Colored Dissolved Organic Matter,CDOM)的干扰是当前的技术难点.文章针对可持续发展科学卫星 1 号(SDGSAT-1)MII传感器,利用Hydrolight辐射传输模型,从理论上挖掘只与悬浮物强相关的反演因子,以此构建适用于MII影像的太湖悬浮物浓度反演模型,通过水体的实测数据和遥感数据对模型应用效果进行验证.结果表明:反演因子R′(B5/B3)与悬浮物浓度为强相关,同时与叶绿素a、CDOM浓度弱相关;利用R′(B5/B3)作为反演因子构建的幂函数模型为最优反演模型;将幂函数模型分别应用于实测数据和 2022 年 5 月 4 日的太湖SDGSAT-1 MII数据,两次验证试验显示反演结果和现场测量结果具有较强一致性,模型适用性较好.该研究可为SDGSAT-1 卫星在湖泊水体悬浮物浓度监测、水资源评估与保护等提供一些技术参考.
Abstract
The use of satellite remote sensing inversion of suspended matter concentration in water bodies is of great significance in water quality monitoring and protection.In the process of suspended matter concentration inversion,it is technically difficult at present to avoid or minimize the interference of chlorophyll-a and colored dissolved organic matter(CDOM)in the water body.Aiming at the"Sustainable Development Goals scientific satellite 1"(SDGSAT-1)MII sensor and using the Hydrolight radiative transfer model,the article theoretically excavates the inversion factor that is only strongly related to suspended matter,constructs an inversion model of Lake Taihu suspended matter concentration suitable for MII images,and applies the model to both measured and sensing image data for verification.The results showed that:the inversion factor R′(B5/B3)was strongly correlated with the suspended matter concentration,while weakly correlated with chlorophyll a and CDOM concentration;the power function model constructed by using R′(B5/B3)as the inversion factor was the optimal inversion model;the power function model was applied to the measured data and the SDGSAT-1 MII data of Lake Taihu on May 4,2022,respectively,and the two verification experiments showed that the inversion results and field measurement results had a strong consistency,and the applicability of the power function model was good.This research can provide a technical reference for the SDGSAT-1 satellite in monitoring suspended matter concentration in lake water bodies,water resources assessment,and protection,etc.
关键词
悬浮物浓度反演/可持续发展科学卫星/1/号/相关性/水体辐射传输模拟/遥感应用Key words
suspended matter concentration retrieval/SDGSAT-1/correlation/water body radiative transfer simulation/remote sensing applications引用本文复制引用
基金项目
国家重点研发计划(2020YFE0200700)
河南理工大学青年骨干教师资助计划(2023XQG-12)
河南省科技攻关项目(232102210043)
出版年
2024
NETL
NSTL
万方数据