Abstract
The estimation of chlorophyll-a concentrations (Chla) in lakes using remote sensing is convenient, but its use remains challenging in large eutrophic water bodies due to the great spatial and temporal variations of its optical properties. Combining the sampling location and date information with Chla data, this study divided the lake water into three types, I, II and III, and then built an optimal Chla estimation model for each type based on 11 datasets collected from 2004 to 2012 in Taihu Lake, China. The resultant model expression is Chla = exp (ax2 + bx + c), where x is R701/R677, (1/R686–1/R695) × R710 and (R690/R550–R675/R700) / (R690/R550 + R675/R700). For the Chla ranging from 2 to 192 mg/m3, the root-mean-square error (RMSE) of the new model decreased up to 5.1 mg/m3 compared to that of previous band combination models, such as band ratio, three-band and four-band models when directly validated. The RMSE of the re-parametrization model (the lowest RMSE < 12 mg/m3) is also lower than for those models (the lowest RMSE > 16 mg/m3), indicating that the Chla estimation model that considers the spatial and temporal variations has a better performance and validation accuracy and therefore is more effective for remote sensing monitoring of water quality.
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Funding
The study was supported by the National Natural Science Foundation of China (No. 41471283). We would like to express our gratitude to Wang Lei, Zhang Xiaowei, Zhou Yu and Sun Xiaopeng for field work and to Zhang Jing for laboratory work.
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Appendix
Appendix
The appendix section lists the typical Chla estimation models before and after the data partition. Figures 12, 13, 14, and 15 present the four models for Type I, II and III based on partitioned data and unpartitioned data; the subfigures in the Z order of each type present scatter plots between the model variable and lnChla, estimated and measured Chla, residuals and predicted Chla, and the QQ plot of residuals, respectively.
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Cheng, C., Wei, Y., Lv, G. et al. Remote sensing estimation of chlorophyll-a concentration in Taihu Lake considering spatial and temporal variations. Environ Monit Assess 191, 84 (2019). https://doi.org/10.1007/s10661-018-7106-4
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DOI: https://doi.org/10.1007/s10661-018-7106-4