Improved conceptual three-band model for Chlorophyll-a retrieval in inland Case-II waters

Jing P. Xu; Fang Li; Bai Zhang; Kai S. Song; Zong M. Wang; Dian W. Liu; Guang X. Zhang

doi:10.1117/12.813039

3 November 2008 Improved conceptual three-band model for Chlorophyll-a retrieval in inland Case-II waters

Jing P. Xu, Fang Li, Bai Zhang, Kai S. Song, Zong M. Wang, Dian W. Liu, Guang X. Zhang

Proceedings Volume 7145, Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Monitoring and Assessment of Natural Resources and Environments; 71451L (2008) https://doi.org/10.1117/12.813039
Event: Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Geo-Simulation and Virtual GIS Environments, 2008, Guangzhou, China

Abstract

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 . 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)-(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 , and 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.

Citation Download Citation

Jing P. Xu, Fang Li, Bai Zhang, Kai S. Song, Zong M. Wang, Dian W. Liu, and Guang X. Zhang "Improved conceptual three-band model for Chlorophyll-a retrieval in inland Case-II waters", Proc. SPIE 7145, Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Monitoring and Assessment of Natural Resources and Environments, 71451L (3 November 2008); https://doi.org/10.1117/12.813039

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