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Height extraction method of high-voltage power line tower based on multi-temporal shadow difference

A technology of high-voltage line towers and shadows, which is applied in the directions of measuring distance, instruments, surveying and navigation, etc., to achieve an effect that is beneficial to popularization

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

[0004] The above methods have achieved good results in building shadow extraction and height estimation methods, but there are still some shortcomings when applied to high-voltage line towers

Method used

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  • Height extraction method of high-voltage power line tower based on multi-temporal shadow difference
  • Height extraction method of high-voltage power line tower based on multi-temporal shadow difference
  • Height extraction method of high-voltage power line tower based on multi-temporal shadow difference

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Embodiment Construction

[0019] The "method for extracting the height of high-voltage line towers based on multi-temporal shadow differences" of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The present invention attempts to establish an automatic height extraction method to more objectively estimate the height of the high-voltage line tower, and provide reference for the route formulation of the unmanned aerial vehicle and the safety monitoring of the national power grid.

[0021] 1) Shadow extraction of high-voltage tower

[0022] The PCA segmentation method is used to divide the image into non-shaded areas and initial shadowed suspected areas. Because under the PCA transformation, the shadow has a specific distribution law, so it is widely used to distinguish vegetation from non-vegetation. figure 2 The GF-2 fusion image of the study area is shown, image 3 It shows the distribution of the first principal component value of the high...

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Abstract

The invention discloses a method for extracting the height of a high-voltage line tower based on multi-temporal shadow differences. The steps are as follows: step 1) extracting the shadow of the high-voltage line tower by using the spectrum and shape characteristics of the shadow of the high-voltage line tower; The shadow point on the top of the tower, and using the difference of shadows in different phases and the principle of shadow imaging, establish a system of equations to solve the vertical projection point on the top of the tower; 3) Based on the shadow point on the top of the tower and the vertical projection point coordinates on the top of the tower, use The triangular relationship between the height, the shadow length and the sun altitude angle, and the average value of the two sets of height values ​​is taken as the final height of the high-voltage line tower.

Description

technical field [0001] The invention is a technology in the field of earth observation. The invention is based on the shadow imaging characteristics of the high-voltage line tower when the sun altitude angle is high, and avoids the complex surface interference caused by the different erection environment of the high-voltage line tower, and realizes the shadow of the high-voltage line tower It is a high-voltage line tower monitoring technology with application value. Background technique [0002] When unmanned aerial vehicles are flying at low or ultra-low altitudes, more and more obstacles such as high-voltage line towers and high-voltage lines have become important safety hazards in general aviation flight. In addition, high-voltage line towers are important infrastructure of the State Grid, which is directly related to the security of the power grid. [0003] At present, the height of high-voltage line towers is usually measured directly using point cloud data to establish...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C3/22
CPCG01C3/22
Inventor 米晓飞杨健占玉林余涛张周威柳鹏张雅洲刘苗孙震笙曹维佳
Owner INST OF REMOTE SENSING & DIGITAL EARTH CHINESE ACADEMY OF SCI
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