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Continuous wavelet coefficient-based second-class water body chlorophyll a concentration inversion method

A technology of wavelet coefficient and chlorophyll, which is applied in the direction of testing water, special data processing applications, material separation, etc., can solve problems such as difficulty in realization, reduction of inversion model accuracy, complex optical characteristics, etc., to facilitate screening, improve inversion accuracy and Modeling efficiency, effect of improving correlation

Inactive Publication Date: 2021-03-19
GUANGZHOU INST OF GEOGRAPHY GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complex optical characteristics of the second-class water body, the interference caused by planktonic algae and its degradation substances, suspended particles in the water body and soluble yellow substances cannot be suppressed during the remote sensing inversion process, resulting in a decrease in the accuracy of the inversion model and difficult to achieve High-precision retrieval of chlorophyll-a concentration

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  • Continuous wavelet coefficient-based second-class water body chlorophyll a concentration inversion method
  • Continuous wavelet coefficient-based second-class water body chlorophyll a concentration inversion method
  • Continuous wavelet coefficient-based second-class water body chlorophyll a concentration inversion method

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Embodiment 1

[0030] This embodiment discloses a method for retrieving the concentration of chlorophyll a in a second-class water body based on continuous wavelet coefficients, such as figure 1 shown, including the following steps:

[0031] S1. Collect the reflectance data R of the surface of the second-class water body on the spot rs (λ), λ represents the wavelength collected, and the chlorophyll a concentration C of the water body is collected synchronously Chl-a .

[0032] Here, specifically, a spectrometer is used to collect reflectance data on the surface of the second-class water body, and a high-performance liquid chromatograph, a fluorescence photometer or a spectrophotometer is used to collect the chlorophyll-a concentration of the second-class water body. Among them, the spectral measurement wavelength range of the spectrometer is 400-900nm, and the mounting methods of the spectrometer include ground, airborne and spaceborne.

[0033] S2. Perform continuous wavelet transformati...

Embodiment 2

[0041] This embodiment discloses a computer-readable storage medium, which stores a program. When the program is executed by a processor, the method for retrieving the concentration of chlorophyll a in a second-class water body based on continuous wavelet coefficients described in Embodiment 1 is implemented, specifically as follows :

[0042] S1. Collect the reflectance data on the surface of the second-class water body on the spot, and collect the chlorophyll a concentration of the water body simultaneously;

[0043] S2. Perform continuous wavelet transformation on the reflectance data at different scales to obtain wavelet coefficients;

[0044] S3. Carrying out a correlation analysis between the wavelet coefficient and the chlorophyll a concentration measured in step S1, and screening out the wavelet coefficient whose correlation coefficient is greater than the preset threshold;

[0045] S4. Carry out partial least squares regression modeling with the wavelet coefficients ...

Embodiment 3

[0049] This embodiment discloses a computing device, which includes a processor and a memory for storing a program executable by the processor. When the processor executes the program stored in the memory, it implements the second-class continuous wavelet coefficient-based method described in Embodiment 1. The inversion method of chlorophyll-a concentration in water body is as follows:

[0050] S1. Collect the reflectance data on the surface of the second-class water body on the spot, and collect the chlorophyll a concentration of the water body simultaneously;

[0051] S2. Perform continuous wavelet transformation on the reflectance data at different scales to obtain wavelet coefficients at different scales;

[0052] S3. Carrying out a correlation analysis between the wavelet coefficient and the chlorophyll a concentration measured in step S1, and screening out the wavelet coefficient whose correlation coefficient is greater than the preset threshold;

[0053] S4. Carry out ...

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Abstract

The invention discloses a continuous wavelet coefficient-based second-class water body chlorophyll a concentration inversion method. The method comprises the following steps that: firstly, the reflectivity data of the surface of a second-class water body and chlorophyll a concentration of the water body are collected on site; then, continuous wavelet transform is carried out on the reflectivity data under different scales to obtain a plurality of wavelet coefficients; correlation analysis is carried out on the wavelet coefficients and the actually measured chlorophyll a concentration, and thewavelet coefficients with high correlation are screened out; partial least squares regression modeling is carried out on the screened wavelet coefficients, and a chlorophyll a concentration inversionmodel with the wavelet coefficients as independent variables and the chlorophyll a concentration as dependent variables is established; for a second-class water body to be detected, the reflectivity data of the surface of the second-class water body are collected on site, the continuous wavelet transformation is conducted on the reflectivity data to obtain wavelet coefficients, inversion is conducted through the chlorophyll a concentration inversion model based on the wavelet coefficients, and finally the chlorophyll a concentration of the second-class water body is obtained. According to themethod, the high-precision inversion of the chlorophyll a concentration of the second-class water body can be realized.

Description

technical field [0001] The invention relates to the technical field of chlorophyll-a concentration inversion of the second-class water body, in particular to a chlorophyll-a concentration inversion method of the second-class water body based on continuous wavelet coefficients. Background technique [0002] Water quality monitoring is an important means of water quality evaluation and water pollution prevention and control. When monitoring the water quality of second-class water bodies such as rivers and lakes, it is usually necessary to detect the concentration of chlorophyll-a in the water. Chlorophyll-a is an important indicator reflecting the eutrophication of water bodies. It is the subject of human research. [0003] At present, the use of hyperspectral data to study chlorophyll concentration is relatively in-depth, and the mathematical statistical relationship between the original remote sensing reflectance and chlorophyll concentration based on measured data is widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N21/55G01N21/25G01N21/31G01N21/64G01N30/02G06F30/20
CPCG01N33/18G01N21/55G01N21/25G01N21/31G01N21/64G01N30/02G06F30/20
Inventor 彭咏石陈水森王重洋陈金月李丹贾凯姜浩王力郑琼官云兰
Owner GUANGZHOU INST OF GEOGRAPHY GUANGDONG ACAD OF SCI