Retrieval and application of chlorophyll-a concentration in the Poyang Lake based on exhaustion method：a case study of Chinese Gaofen-5 Satellite AHSI data
1.State Key Laboratory of Information Engineering in Surveying， Mapping and Remote Sensing， Wuhan University， Wuhan 430079， China；2.Beijing Urban Construction Exploration & Surveying， Beijing 100101， China
Abstract：Retrieval of chlorophyll-a concentration in turbid water with complicated optical characteristics has always been a difficulty in remote sensing research on water environment， and hyperspectral is a promising method that is expected to solve this problem because of its advantages such as narrow wave width， multiple spectral bands and approximately continuous information acquisition of ground objects. This study establishes a three-band inversion model of chlorophyll-a concentration at the Poyang Lake for GF-5 Advanced HyperSpectral Imager (AHSI) using the exhaustive method. This model is validated based on the in-situ hyperspectrum and chlorophyll-a concentration data obtained in October 2009， July 2011， and October 2016， with a determination coefficient (R2) of 0.82 and a root mean square error (RMSE) of 1.468 μg·L－1. By comparing and analyzing the GF-5 AHSI and Sentinel-2A MultiSpectral Instrument (MSI) chlorophyll-a concentration inversion results at the Poyang Lake on October 7， 2018， we found that the spatial distribution of the two results were highly consistent， and the relative bias between them for more than 80% area of the Poyang Lake was less than 8%， which effectively demonstrated the potential of GF-5 AHSI in the monitoring of chlorophyll-a concentration for turbid waters.
韦安娜,田礼乔,陈晓玲,余永明. 基于穷举法的鄱阳湖叶绿素a浓度高光谱反演模型与应用研究——以GF-5卫星AHSI数据为例[J]. 华中师范大学学报(自然科学版), 2020, 54(3): 447-453.
WEI Anna,TIAN Liqiao,CHEN Xiaoling,YU Yongming. Retrieval and application of chlorophyll-a concentration in the Poyang Lake based on exhaustion method：a case study of Chinese Gaofen-5 Satellite AHSI data. journal1, 2020, 54(3): 447-453.
2020, Vol. 54 
