Water color detecting method and device based on MODIS image

Abstract

The embodiment of the invention provides a water color detecting method and device based on an MODIS image. The method comprises the steps of acquiring the MODIS image which reflects the color of water and is provided with an RGB band combination; converting the RGB value of each pixel of the MODIS image into tristimulus values; calculating the chromaticity coordinates of each pixel in a chromaticity diagram coordinate system based on the tristimulus values of each pixel; calculating the new coordinates of the chromaticity coordinates of each pixel in a predetermined coordinate system; calculating the included angle between the new coordinate point of each pixel and the X axis of the predetermined coordinate system; determining the color dominant wavelength of each included angle according to the corresponding relation between a predetermined included angle and a color dominant wavelength, and determining the water color level of each included angle according to the corresponding relation between the predetermined included angle and the water color level; determining water color according to the determined color dominant wavelengths and the determined water color levels. By the adoption of the embodiment, macroscopic wide-range long-term remote sensing detection of water color is achieved in a remote sensing way.

Description

technical field [0001] The present invention relates to the technical field of remote sensing image color parameter extraction, more specifically, to a water body color detection method and device based on MODIS (Moderate-resolution Imaging Spectroradiometer) images. Background technique [0002] The color of the water body is the direct result of the interaction between the sun's rays and the photoactive substances in the water body in the visible light range, and is closely related to the water quality of the water body. Water body color is one of the routine monitoring indicators of water quality, so the detection of water body color is of great significance for water quality monitoring. [0003] The inventors of the present invention have found that: at present, it is a demand to use remote sensing means to perform macroscopic and long-term remote sensing detection of the color of water bodies; and three main photoactive substances in water bodies: phytoplankton, suspend...

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Problems solved by technology

[0003] The inventors of the present invention have found that: at present, it is a demand to use remote sensing means to perform macroscopic and long-term remote sensing detection of the color of water bodies; and three main photoactive substances in water bodies: phytoplankton, suspended matter and colored soluble organic matter Together determine the color of the water body; in the water body, the three substances show various possible combinations, the concentrations of the three substances change independently and in a wide range, and the optical properties of the water body are complex and changeable, making water color remote sensing a multi-variable non- Linear complex problems; therefore, there is no solution in the prior art that can be applied to macroscopic, large-scale, long-term remote sensing detection of water body color by means of remote sensing

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