Method for automatically recognizing shear line

A technology of automatic identification and shearing, applied in the field of meteorology

Active Publication Date: 2019-09-10
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a method for automatically identifying the shear line, which solves the problem that the analysis of the shear line in the meteorological business is still carried out through human-computer interaction, and the forecaster performs manual operation according to his own experience. disadvantages, problems, problems

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  • Method for automatically recognizing shear line
  • Method for automatically recognizing shear line

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Embodiment

[0069] The shear line is a narrow and long area where the wind direction changes sharply, and the horizontal cyclonicity of the wind direction changes greatly, so the shear line is located according to the wind field. The wind is a two-dimensional vector on a certain height plane, and the results of the two-dimensional vector cross product are used to judge and screen possible shears, and finally connect the shears to form a shear line to achieve the purpose of locating the shear line. Vector cross product is also called vector product. In mathematics, it is also called outer product and cross product. In physics, it is called vector product and cross product. It is a binary operation of vectors in vector space. Suppose there are two three-dimensional vectors a and b, then a×b is:

[0070]

[0071] Among them, i, j, and k are the unit direction vectors of the x-axis, y-axis, and z-axis respectively, and the subscripts of the a and b vectors represent their horizontal compon...

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Abstract

The invention provides a method for automatically recognizing a shear line. The method comprises the following steps: performing standardized processing on a wind field; partitioning lattice points and performing multiplication cross computation on the wind vectors on the lattice points after partitioning, and obtaining cyclonic characteristic points in the wind field through a multiplication cross positive value; taking an establishment judgment threshold of the maximum multiplication cross positive value, and screening out shear nodes from the cyclonic characteristic points; eliminating intersected shear lines according to a shear node analysis method, and then constructing the shear line by connecting the shear nodes in groups. The possible shear of the judgement and screening can be performed by utilizing the two-dimensional vector multiplication cross result, and the shear nodes are finally connected to form the shear line, thereby reaching an aim of automatically recognizing andpositioning the shear line. The shear line analysis in the current meteorological service still uses the human-machine interaction way, the disadvantage problem that the forecast personnel performs manual operation according to the own experience is solved, thereby laying a solid foundation for realizing the automatic analysis forecast and artificial intelligence in the weather service.

Description

technical field [0001] The invention belongs to the field of meteorology, in particular to a method for automatically identifying shear lines. Background technique [0002] The shear line is a long and narrow area where the wind direction changes sharply, and the horizontal cyclone of the wind direction changes greatly, which is often accompanied by precipitation. Shear lines can appear both on the ground and at high altitudes, but mainly at 700hPa and 850hPa high altitudes. Such as Figure 20 As shown, the wind in the meteorological work is represented by the wind direction rod, and the wind direction rod indicates the magnitude and direction of the wind at the same time, such as Figure 21 Shown is the presentation of the shear line on the weather map. According to their positions, shear lines are divided into: South China shear line, Jianghuai shear line, North China shear line, Plateau shear line, etc., all of which have a huge impact on precipitation in my country. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01W1/10
CPCG01W1/10
Inventor 胡文东丁禹钦舒红平甘建红刘敦龙罗飞
Owner CHENGDU UNIV OF INFORMATION TECH
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