Four-band semi-analysis model for inverting chlorophyll a concentration in high-turbidity water body

A technology of chlorophyll and turbidity, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of poor promotion, unstable parameters, inability to overcome the influence of suspended matter concentration and optical properties of colored soluble organic matter, etc. question

Inactive Publication Date: 2012-06-20
NANJING NORMAL UNIVERSITY
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Problems solved by technology

Although the existing semi-empirical model has a certain physical basis, it still cannot overcome the influence of the concentration of suspended solids and the optical properties of colored soluble organic matter
The parameters of the existing three-band model are very unstable when used in high turbidity water, and the generalization is not strong, so the method needs to be improved for high turbidity water

Method used

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  • Four-band semi-analysis model for inverting chlorophyll a concentration in high-turbidity water body
  • Four-band semi-analysis model for inverting chlorophyll a concentration in high-turbidity water body
  • Four-band semi-analysis model for inverting chlorophyll a concentration in high-turbidity water body

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Embodiment Construction

[0034] The present invention adopts the following technical ideas: first, improve the original three-band semi-analytical model according to the principle of bio-optics, and increase the remote sensing reflectivity parameter of the fourth band to remove the impact of absorption and backscattering of suspended particles in high-turbidity water bodies. Obstacles brought by the extraction of chlorophyll a concentration information; then, through an iterative method, determine the band combination with the highest correlation between eigenvalues ​​and chlorophyll a concentration, and finally obtain a four-band semi-analytic model for chlorophyll a concentration in high turbidity water.

[0035] The data used in this example is the optical characteristics of water body and the concentration information of water body components collected in Taihu Lake from November 8 to 22, 2007. A total of 52 data points, the average suspended solids concentration reached 38.2mg / L, which belonged to...

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Abstract

The invention discloses a method used for building a four-band semi-analysis model for inverting the chlorophyll a concentration in a high-turbidity water body. According to the method, a fourth band is introduced on the basis of the original three-band semi-analysis model for improvement, [Rrs-1(Lambda 4)-Rrs-1(Lambda 3)]-1 is used for replacing the Rrs(Lambda3) part in a three-band model factor and is used for reducing the backward scattering and absorption of suspension particles in the high-turbidity water body and the influence of colored dissolved organic matter (CDOM) on the remote sensing reflection rate, the chlorophyll a concentration characteristics are stressed, then, the positions of four corresponding bands are determined by a iteration method, influence factors are determined, and in addition, an inverting model is further obtained through linear regression. Compared with the three-band semi-analysis model, the model provided by the invention has the advantages that the chlorophyll a concentration in the high-turbidity water body is inverted, the influence of the suspension concentration and the CDOM is minimized, and the model precision is improved to a great degree.

Description

technical field [0001] The invention belongs to the field of remote sensing copyright protection, and in particular relates to a four-band semi-analysis model for the concentration of chlorophyll a in high turbidity water bodies. Background technique [0002] The inversion of chlorophyll-a concentration in inland turbid water is an important research hotspot in water color remote sensing. Due to the complexity of the optical properties of inland water, it is difficult to accurately retrieve the concentration of chlorophyll-a in inland turbid water. At present, most of the models for inversion of chlorophyll-a concentration in inland waters are empirical models, which lack a certain physical basis. Although the existing semi-empirical model has a certain physical basis, it still cannot overcome the influence of the concentration of suspended matter and the optical properties of colored soluble organic matter. The parameters of the existing three-band model are very unstable...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 乐成峰吕恒
Owner NANJING NORMAL UNIVERSITY
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