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Method and device for image terrain radiation correction

A terrain radiation correction and terrain technology, applied in image enhancement, image analysis, measuring devices, etc., can solve the problems of quantitative remote sensing application difficulties

Active Publication Date: 2021-02-19
INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI +4
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Problems solved by technology

However, as the resolution increases, the image radiation distortion caused by terrain undulations becomes more and more obvious. For example, the same type of ground objects on the shady and sunny slopes of the mountain show significant differences in the image, and the image classification or other quantitative remote sensing Application brings great difficulties

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  • Method and device for image terrain radiation correction
  • Method and device for image terrain radiation correction
  • Method and device for image terrain radiation correction

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Embodiment Construction

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0070] The embodiment of the present application discloses a method for image terrain radiation correction, see figure 1 As shown, the method includes:

[0071] S101. Read the solar zenith angle and solar azimuth of the image to be corrected;

[0072] Specifically, general remote sensing images will directly give the solar zenith angle θ s and solar azimuth φ s Therefore, it is enough to directly read the solar zenith angle and solar azimuth angle from the image to be corrected a...

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Abstract

This application proposes a method for image terrain radiation correction, which includes: reading the solar zenith angle and solar azimuth angle of the image to be corrected; using the digital elevation model to calculate the slope and aspect, as well as the reference shading factor; calculating the sky according to the slope Observation factors, and calculate the effective solar incidence angle according to the sun zenith angle, slope, aspect and solar azimuth; extract the shadow area of ​​the image to be corrected, and use the reference shadowing factor to correct the shadow area to determine the shadowing factor; use radiation The transmission model calculates the atmospheric-related radiation; according to the solar zenith angle, sky observation factor, solar effective incidence angle, shading factor, and atmospheric-related radiation, using the preset albedo calculation formula or relative albedo formula, calculate the to-be Corrects the reflectance of each pixel in the image. The above method can be used to correct the topographic radiation of the image, and realize the topographic radiation correction of the image.

Description

technical field [0001] The present application relates to the technical field of image radiation processing, and more specifically, to a method and device for image terrain radiation correction. Background technique [0002] With the development of remote sensing technology, high-resolution images are increasing, and related applications are becoming more and more extensive. However, as the resolution increases, the image radiation distortion caused by terrain undulations becomes more and more obvious. For example, the same type of ground objects on the shady and sunny slopes of the mountain show significant differences in the image, and the image classification or other quantitative remote sensing application poses great difficulties. [0003] Therefore, it is an urgent need for high-resolution images to be applied in remote sensing technology to perform terrain radiation correction processing on images. Contents of the invention [0004] Based on the above requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C1/00G06T5/00
CPCG01C1/00G06T2207/10032G06T2207/30181G06T5/90
Inventor 张浩丁一帆闫东川陈正超赵广宁王霁云
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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