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Method and device for calibrating water body absorption coefficient

A technology of absorption coefficient and correction method, which is applied in complex mathematical operations, instruments, informatics, etc., can solve the problems of red light and near-infrared light outer band correction and inaccurate correction

Active Publication Date: 2020-04-21
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a method and device for correcting the absorption coefficient of water body, which solves the problems of over-correction and inaccurate correction in the outer bands of red and near-infrared light

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  • Method and device for calibrating water body absorption coefficient
  • Method and device for calibrating water body absorption coefficient
  • Method and device for calibrating water body absorption coefficient

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Embodiment 1

[0056] see figure 1 A water body absorption coefficient correction method provided in Embodiment 1 of the present invention, the method includes the following steps:

[0057] S11. Perform data processing on the collected raw data of the water body, and generate processed water body absorption data;

[0058] It should be noted that, in the embodiment of the present invention, the original water body data is collected by the 9-band absorption attenuation measuring instrument (AC9 for short) developed and produced by WET Labs in the United States or the upgraded replacement product of AC9, namely the absorption attenuation spectrometer (ACS). , because the AC9 / ACS instrument has high measurement accuracy for oceanic water bodies and relatively clean water bodies, the measurement cost is negligible compared with laboratory measurement absorption methods, and it has many advantages such as easy portability and use. It is the preferred instrument for on-site measurement of absorpti...

Embodiment 2

[0067] Referring to embodiment one of the present invention and figure 1 For the specific process of steps S11 to S14 described in , see figure 2 , the step S11 performs data processing on the collected raw data of the water body to generate processed water body absorption data, specifically including:

[0068] S111. Collect and obtain the raw data of the water body;

[0069] S112. Perform data conversion on the original data to obtain physical quantity data corresponding to the original data;

[0070] It is understandable that the on-site measurement equipment for the inherent optical properties of the water body needs more stringent calibration. The raw data of the water body collected by the AC9 / ACS instrument is signal data, which needs to be loaded through the acquisition software system WetView software provided by the instrument manufacturer. The calibration file can complete the conversion of the original data to the measured physical quantity according to the calib...

Embodiment 3

[0101] Corresponding to the method for calibrating water body absorption coefficient disclosed in Embodiment 1 and Embodiment 2 of the present invention, Embodiment 3 of the present invention also provides a water body absorption coefficient calibrating device, see Figure 5 , the device consists of:

[0102] The data processing module 1 is used to perform data processing on the collected raw data of the water body, and generate processed water body absorption data;

[0103] The correction module 2 is used to correct the temperature and salinity of the processed water body data to obtain the preliminary corrected water body absorption coefficient and attenuation coefficient;

[0104] The calculation module 3 is used to construct an exponential fitting equation group according to the water body absorption coefficient and attenuation coefficient after preliminary correction, and calculate the scattering amplitude;

[0105] The correction module 4 is configured to correct the pr...

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Abstract

The invention discloses a water body absorption coefficient correction method and device. The method comprises the steps of conducting data processing on acquired original data of a water body to generate processed water body data; conducting temperature and salinity correction on the processed water body data to obtain a preliminarily corrected water body absorption coefficient and attenuation coefficient; constructing an exponential fitting equation set according to the corrected water body absorption coefficient and attenuation coefficient and conducting calculation to obtain a scattering amplitude; conducting correction on the corrected water body absorption coefficient and attenuation coefficient according to the scattering amplitude and conducting calculation to obtain a water body target absorption coefficient. According to the water body absorption coefficient correction method and device, the problems of overcorrection and inaccurate correction of infrared and near-infrared outer wave bands are solved.

Description

technical field [0001] The invention relates to the technical field of water body absorption coefficient, in particular to a method and device for accurately correcting the absorption coefficient of a second-class water body on site based on an E index fitting method. Background technique [0002] Water body absorption coefficient is an important parameter to evaluate and detect water quality and water body ecological environment. Accurate water body absorption coefficient requires precise optical instruments for corresponding measurement and correction. At present, the commonly used measuring instrument is the 9-band absorption attenuation measuring instrument (AC9 for short) developed and produced by WET Labs in the United States. With the increase of the water color satellite bands and the demand for water hyperspectral research, the company has launched an upgraded replacement product of AC9, namely the absorption Attenuation Spectrometer (ACS). AC9 or ACS instruments h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCG16Z99/00
Inventor 张兵廖小罕叶虎平李俊生朱建华申茜李铜基张方方张宗科魏显虎
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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