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Topographic Correction Method for Optical Remote Sensing Image Based on Radiation Transfer Mechanism in Canopy

A technology of terrain correction and internal radiation, which is applied in the direction of material analysis, scientific instruments, instruments, etc. through optical means, can solve problems such as limiting wide application, and achieve the effect of improving application potential

Active Publication Date: 2021-03-16
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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Problems solved by technology

However, radiative transfer in slope canopy is a highly nonlinear physical process, which satisfies the formula The assumption is too simple, so there is a large uncertainty in the D-S correction, which limits its wide application

Method used

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  • Topographic Correction Method for Optical Remote Sensing Image Based on Radiation Transfer Mechanism in Canopy
  • Topographic Correction Method for Optical Remote Sensing Image Based on Radiation Transfer Mechanism in Canopy
  • Topographic Correction Method for Optical Remote Sensing Image Based on Radiation Transfer Mechanism in Canopy

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Embodiment

[0056] Such as figure 1 As shown, a topographic correction method for optical remote sensing images based on the radiative transfer mechanism within the canopy includes the following steps:

[0057] S1. Collect optical remote sensing images and DEM data of the target;

[0058] S2. Calculate the slope and aspect according to the DEM data, calculate the imaging geometry per pixel according to the image header file, and then calculate the flat or slope extinction path corresponding to each pixel according to the following formula,

[0059] S(θ)=1 / cos(θ)

[0060]

[0061] In the formula, θ and φ are the sun / observation zenith angle and azimuth angle respectively, α and β are the slope and aspect, respectively, and S and St are the normalized extinction paths of flat land and slope land under the same imaging geometric conditions, respectively;

[0062] At the same time, the atmospheric correction is performed on the remote sensing image to obtain the surface reflectance;

[...

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Abstract

The invention relates to the technical field of terrain correction of optical remote sensing images. Starting from the physical mechanism of photon-canopy-terrain interaction, by simplifying the radiation transfer equation, a method of terrain correction for optical remote sensing images is proposed that takes into account the completeness of the physical mechanism and the simplicity of mathematical forms. , including the following steps: collecting the optical remote sensing image and DEM data of the target; calculating the slope and aspect according to the DEM data, and calculating the imaging geometry pixel by pixel according to the image header file; performing atmospheric correction on the remote sensing image to obtain the surface reflectance; and then Calculate the flat or slope extinction path corresponding to each pixel; take the surface reflectance and extinction path as input, and correct the slope reflectance to the flat reflectance. The terrain correction method of the invention has strong universality, has operational operation capability, and helps to improve the application potential of satellite remote sensing technology in mountainous areas.

Description

technical field [0001] The invention relates to the technical field of topographic correction of optical remote sensing images, in particular to a topographic correction method of optical remote sensing images based on a radiation transmission mechanism within a canopy. Background technique [0002] Due to its macroscopic, dynamic and objective advantages, remote sensing technology has been widely used in many fields such as environmental monitoring, disaster prevention and mitigation, and agricultural production estimation. However, in mountainous areas with complex terrain, the terrain significantly affects the imaging process of optical remote sensing, so that the radiation signal of remote sensing observation contains too much non-ground factual terrain disturbance information. Suppressing the terrain information in the optical remote sensing signal to obtain the equivalent flat reflectance of the image (ie terrain correction) is the basic preprocessing technology for th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/17
CPCG01N21/17G01N2021/1793
Inventor 尹高飞
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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