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Model method for estimating diffuse attenuation coefficient of water body by using OLI (operational land imager) data

A technology of attenuation coefficient and water body, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of inability to obtain large-area water area data, time-consuming and labor-intensive measurement process, etc., and achieve the effect of facilitating overall evaluation

Active Publication Date: 2016-12-21
南京吉泽信息科技有限公司
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Problems solved by technology

[0007] The method of on-site measurement obtains accurate data, but it is impossible to obtain data on large areas of water, and the measurement process is time-consuming and laborious. If remote sensing technology can be used to establish a satellite image estimation model for the diffuse attenuation coefficient of water bodies, the diffuse attenuation coefficient of the entire water area can be obtained simultaneously information, and can realize the evaluation of the water environment of the whole water body

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  • Model method for estimating diffuse attenuation coefficient of water body by using OLI (operational land imager) data
  • Model method for estimating diffuse attenuation coefficient of water body by using OLI (operational land imager) data
  • Model method for estimating diffuse attenuation coefficient of water body by using OLI (operational land imager) data

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Embodiment Construction

[0022] Such as figure 1 As shown, the present invention discloses a model method for estimating the diffuse attenuation coefficient of a water body using OLI data, comprising the following steps:

[0023] Step 1: Use the land imager carried by the Landsat8 satellite to conduct remote sensing monitoring of inland water bodies to obtain OLI images of water bodies;

[0024] Step 2: Atmospheric correction is performed on the acquired OLI image of the water body to obtain the atmospherically corrected remote sensing reflectance values ​​in the green light band and near-infrared band;

[0025] Step 3: Use formula 1 to calculate the diffuse attenuation coefficient of 490nm wavelength, formula 1 is as follows:

[0026] K d (490) OLI =2.468*ln(R rs (NIR) / R rs (Green))+8.81 Formula 1

[0027] Among them, K d (490) is the diffuse attenuation coefficient of 490nm wavelength, R rs (Green) and R rs (NIR) is the atmospherically corrected remote sensing reflectance value of the green...

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Abstract

The invention relates to the field of evaluation for water body quality, in particular to a model method for estimating diffuse attenuation coefficient of a water body by using OLI (operational land imager) data. The model method is provided for inland waters of China, and green and near-infrared bands of OLI data are selected in the method; water diffuse attenuation coefficient is estimated by using satellite remote sensing data, the defect that conventional detection requires on-site sampling and observation for a ground sample point is overcome, it is possible to quickly acquire diffuse attenuation coefficient of a whole water area, and it is convenient to provide overall evaluation for water body quality spatial differences and water ecological environment.

Description

technical field [0001] The invention relates to the field of water body quality evaluation, in particular to a model method for estimating water body diffuse attenuation coefficient by using OLI data. Background technique [0002] When solar radiation enters the water body, it is affected by the absorption and scattering of water body components such as suspended particles, phytoplankton, and colored soluble organic matter in the water body, and the irradiance decays exponentially with the increase of depth. This attenuation index is the diffuse attenuation coefficient. (diffuse attenuation coefficient). The diffuse attenuation coefficient is an important characterization parameter of water clarity, and it is also the main parameter to describe the underwater light field and the ecological environment of the water body. [0003] The definition of the diffuse attenuation coefficient is as follows: [0004] K d ( ...

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 李云梅郑著彬
Owner 南京吉泽信息科技有限公司
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