Retrieval of Chlorophyll a Concentration in Water Considering High-Concentration Samples and Spectral Absorption Characteristics

The envelope removal method has the advantage of suppressing background spectrum and expanding weak absorption characteristic information. However, for second-class water bodies with a relatively complex quality, there are few studies on inversion chlorophyll (Chl-a) concentration in that consider spectral characteristics. In addition, current research Chl-a was carried out under condition sample equilibrium. For areas highly variable concentration, it is still challenging to establish applicable accurate model. Taking Dongting Lake China as an example, this study used high-concentration samples characteristics invert concentration. decap preprocess large deviations, extract parameters body. On basis correlation analysis between characteristics, inverted. results showed following: (1) bands were significantly related had coefficient mainly located three valleys (400–580, 580–650, 650–710 nm) curve. Moreover, at nm better than 400–580 580–650 nm. (2) Compared conventional model, uncapped model higher RP2 lower RMSEP, closer predicted value 1:1 line. performance indicating effective preprocessing deviations. (3) predictive capabilities ER_New those R_New This shows can amplify original spectrum, which improve prediction (4) From models parameters, A650–710 nm_New D650–710 exhibited best performance. combined (A650–710 nm&D650–710 nm_New, nm&NI_New, nm&DI_New) also demonstrated good capabilities. demonstrates feasibility using feature retrieve