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Method of extracting trough ridge feature points and trough ridge feature lines from contour data and synoptic chart analysis method

A technology of data extraction and contour, applied in image analysis, image data processing, image enhancement, etc., can solve the problems of complex calculation, inability to find ridge points and ridge lines at the same time, and identification errors of groove points, etc., and achieve accurate results , fast processing speed, beautiful curve effect

Active Publication Date: 2018-12-28
CHENGDU UNIV OF INFORMATION TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: on the one hand, not only the calculation is complicated, but also there are certain errors in the identification of slot points; on the other hand, for the equivalent field data to be analyzed, only slot points and slot lines can be found, and cannot be Finding Ridge Points and Ridge Lines

Method used

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  • Method of extracting trough ridge feature points and trough ridge feature lines from contour data and synoptic chart analysis method
  • Method of extracting trough ridge feature points and trough ridge feature lines from contour data and synoptic chart analysis method
  • Method of extracting trough ridge feature points and trough ridge feature lines from contour data and synoptic chart analysis method

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Embodiment 1

[0047] Such as Figure 1 to Figure 14 As shown, the contour data are used to extract the trough and ridge feature lines from the 500hPa pressure field data of the upper-air synoptic map.

[0048] figure 1 is a schematic flow chart of the method.

[0049] 1. Generate isobar data field

[0050] According to the original isobaric field data ( figure 2 is the original isobaric field data at 500hPa), and a series of isobaric lines are obtained by using the contour tracing method. Specific steps: According to the coverage of the original isobaric field data (four boundary points) and the air pressure value of each latitude and longitude coordinate position, a rectangular range is generated and gridded and subdivided ( image 3 is the gridded diagram of the original isobaric field data), obtain the latitude and longitude coordinates of each grid and its air pressure value, and then use the contour tracking method to generate each isobaric line to obtain the isobaric data field (...

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Abstract

The invention discloses a method for extracting characteristic points and characteristic lines of a trough ridge by using contour data, and a weather chart analysis method. The present invention provides a method for extracting groove ridge feature points from contour field data. For the non-closed contour, three points are chosen according to the included angles of every three points on the contour, and the selected points are formed into a sequence S, and the characteristic points of the groove ridge are determined according to the arc characteristics of S. The invention provides a method for extracting groove ridge characteristic lines by using contour line data. On the basis of extracting groove ridge characteristic points, the groove / ridge point properties are identified in three schemes, the groove / ridge points are clustered according to distance conditions, and finally, all groove / ridge points of a congruence cluster are simulated by using a Bessel curve to obtain groove / ridge lines. The invention provides an application of two methods in the analysis of weather maps and topographic maps, and a weather map analysis method. The method of the invention can simultaneously identify the groove point and the ridge point, generate the groove line and the ridge line, has high algorithm efficiency and accurate result, and the obtained groove ridge line has no crossing and beautiful appearance.

Description

technical field [0001] The invention relates to a method for processing isovalue field data, in particular to a method for extracting ridge feature points by using isovalue line data, a method for providing ridge feature lines, the application of the two, and a weather map analysis method. The invention belongs to the technical field of data feature extraction and weather state prediction. Background technique [0002] The automatic identification of troughs is an important part of the automatic analysis of weather maps, but the current analysis of meteorological troughs is mainly done manually. Generally speaking, the trough line corresponds to the ridge line. It is the connection line of the maximum curvature point of the contour line according to certain rules. It is called the ridge line and the valley line in the terrain data analysis. In the field of meteorology, the trough line is usually formed by connecting the points with the maximum curvature of the contour line ...

Claims

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Application Information

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IPC IPC(8): G06T7/60G06T5/00
CPCG06T7/60G06T2207/30192G06T5/70
Inventor 刘敦龙胡文东罗飞舒红平唐錾钊
Owner CHENGDU UNIV OF INFORMATION TECH
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