Water body inherent optical quantity inversion method based on backscattering coefficient linear constraint

Abstract

The invention discloses a water body inherent optical quantity inversion method based on backscattering coefficient linear constraint. The method is based on hyperspectral data above a visible near infrared-shortwave spectrum water surface and comprises steps as follows: (1) water-leaving reflectivity is corrected by the aid of data at the waveband of 1,600-1,700 nm, and underwater reflectivity and single-time emissivity are calculated; (2) by the aid of backscattering coefficient spectrum linear constraint at the waveband of 700-850 nm, the optimal value of a reference wave band particle absorption coefficient is calculated; (3) regression is performed on particle backscattering coefficients of a series of calculated wavelengths at the waveband of 700-850 nm, parameters in a particle backscattering coefficient estimation model are obtained, and backscattering coefficients and absorption coefficients of all wavelengths are calculated. The method is applicable to inversion of inherent optical quantities of inland turbid water bodies and plays an important role in monitoring water quality of the inland water bodies.

Description

Technical field [0001] The invention belongs to the field of environmental remote sensing and water environment monitoring, and particularly relates to a backscattering coefficient-based linear constraint inversion method suitable for inversion of inherent optical quantities of inland turbid water bodies. Background technique [0002] The optical properties of water have an important indicator for the ecosystem functions of the water environment. The inherent optical quantity of the water is one of the most important parameters. The inherent optical quantity is related to the water quality such as chlorophyll, phytoplankton, total suspended matter, and soluble organic matter in the water. The parameter content inversion is of great significance, so as to meet the increasing demand for water quality monitoring. [0003] At present, the inversion methods of inherent optical quantities of water bodies include empirical methods, semi-empirical methods, semi-analytical methods and analy...

AI Technical Summary

Problems solved by technology

Although these algorithms have been used to some extent in the estimation of the inherent optical quantity, total suspended solids and chlorophyll content of inland turbid water, some assumptions in the algorithm still cannot adapt to the complex and changeable reality of inland turbid water.

Images