Drawing method of isopiestic line air pressure slot line and ridge line

A technology of isobars and barometric troughs, which is applied in the field of automatic analysis of weather circulation maps, can solve the problems of non-existent and accurate judgment of trough lines and ridge lines, and achieve good results of automatic analysis and recognition

Inactive Publication Date: 2018-06-29
CHENGDU UNIV OF INFORMATION TECH
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Problems solved by technology

The automatic analysis of troughs and ridges is an important part of the automatic analysis of weather circulation maps. The current analysis of troughs in weather systems is mainly done manually. At present, there is no method for more accurate judgment of troughs and ridges.

Method used

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  • Drawing method of isopiestic line air pressure slot line and ridge line
  • Drawing method of isopiestic line air pressure slot line and ridge line
  • Drawing method of isopiestic line air pressure slot line and ridge line

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Embodiment Construction

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0037] Such as figure 1 As shown, a method for drawing isobar barometric troughs and ridges includes the following steps:

[0038] S1. Determine whether the isobar is a closed curve, if so, go to step S2, otherwise go to step S3.

[0039] In step S1, the method for judging whether the isobar is a closed curve is: find out the starting point and end point of the isobar, and judge whether the latitude and longitude of the two points in the weather system are the same, if they are the same, then it is a closed curve; closed curve.

[0040] S2. Extracting groove points and ridge points through the chord cutting method.

[0041] Such as figure 2 As shown, step S2 specifically includes the following steps:

[0042] ...

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Abstract

The present invention relates to a drawing method of isopiestic line air pressure slot line and ridge line. The method comprises the steps of: determining whether an isopiestic line is a closed curveor not, if yes, extracting slot points and ridge points by employing a chord contact method, or else, extracting slot points and ridge points according to the position where the isopiestic line is located; and tracking the slot points and ridge points, and connecting the slot points and the ridge points. In the invention, extraction of the slot points and the ridge points of an air pressure fieldcan be tested based on the chord contact method, and the least square method curve fitting algorithm is employed to provide a unique ligature method of the slot points and the ridge points to obtain agood automatic identification result of the slot points and the ridge points. The connection result of the slot points and the ridge points meets the requirements of the weather system slot and ridgeline analysis to reflect the trend of the slot points and the ridge points, and the test result shows that the algorithm can complete the automatic analysis and identification of the slot lines and ridge lines of the weather system.

Description

technical field [0001] The invention relates to the technical field of automatic analysis of weather circulation maps, in particular to a method for drawing pressure trough lines and ridge lines of isobars. Background technique [0002] Upper-air weather maps are upper-air meteorological data used to analyze upper-air weather systems and atmospheric conditions. The method of expressing the weather situation at high altitude generally does not use the pressure distribution at a fixed height, but looks at the weather map on an isobaric surface with equal pressure, and analyzes the unevenness of this surface. The analysis content of the upper-air synoptic map mainly includes contour lines, isotherms, trough lines, ridge lines, and shear lines. [0003] In meteorology, the trough line refers to the line connecting the points with the largest cyclonic curvature of the isobar and the lowest air pressure (or geopotential height) in the low-pressure trough; The area below the othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/20
CPCG06T11/203G06T11/206G06T2207/30192
Inventor 甘建红胡文东舒红平王式功刘敦龙罗飞
Owner CHENGDU UNIV OF INFORMATION TECH
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