Fig. 1. Sensitivity analysis of chlorophyll content using PROSPECT model
(a): Reflectivity curves for different chlorophyll contents; (b): Sensitivity analysis of chlorophyll content

Fig. 2. The measured reflectivity spectra
(a): Measured in 2019; (b): Measured in 2020; (c): Wavelet denoised spectra in 2019;(d): Wavelet denoised spectra in 2020; (e): SNV processed spectra in 2019; (f): SNV processed spectra in 2020

Fig. 3. Sensitive band filtering results
(a): SEN-BAND, SPA-BAND; (b): BP-BAND

Fig. 4. Modeling and verification results with SPA-BAND sensitive bands in 2019 and 2020
(a): In 2019; (b): In 2020

Fig. 5. Dynamic chlorophyll distribution results based on PLSR model
(a): Field fertilization distribution; (b): Detected distribution in 2019; (c): Detected distribution in 2020