Improved conceptual three-band model for Chlorophyll-a retrieval in Inland Case-Ⅱwaters
In terms of the importance and challenge of accurate Chlorophyll-a (Chla) estimation in inland Case-Ⅱ waters,many empirical or semi-empirical algorithms are established to extract information on Chla concentrations from remote sensing reflectance Rrs.However,the assumption that the optical parameter of Chla specific absorption coefficient a*ph(λ) remains constant usually restrains their estimating accuracy,including the conceptual three-band model Rrs-1(λ1)-Rrs-1(λ2)×Rrs(λ3) developed originally for estimating Chla amounts in terrestrial vegetation recently.Therefore,in this paper,an improved conceptual three-band model with the correction of Chla specific absorption coefficient Rrs-1(λ1)-Rrs-1(λ2)×Rrs(λ3)×a*ph-1(λ1) was presented to estimate Chla contents for Shitoukoumen Reservoir,as a typical example of inland Case-Ⅱ waters.According to the optical characteristics of waters studied,spectral regions included in the model were tuned to eliminate other interferences such as the variability of Chla fluorescence quantum yield,which resulted in the optimal positions for λ1,λ2 and λ3 at 668nm,678nm and 717nm respectively.Compared with the previous three-band model,the improve model gave out a much better estimating performance with a high coefficient determination (0.92) and a low root mean squared error (0.88μgl-1).Although the findings underline the rationale behind the improved model,an extensive database containing data in different water conditions and water types is required to test the accuracy of the model.
Remote sensing Chlorophyll-a Model Inland Case-Ⅱ waters Shitoukoumen Reservoir
Jing P.Xu Fang Li Bai Zhang Kai S.Song Zong M.Wang
Northeast Institute of Geography and Agricultural Ecology,Changchun 130012,China;Graduate School of Northeast Institute of Geography and Agricultural Ecology,Changchun 130012,China
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）