Method for extracting and automatically drawing characteristic points of groove and ridge lines

A feature point extraction and automatic drawing technology, applied in the field of trough and ridge lines in the field of meteorology, can solve the problems of economic loss, casualties, time-consuming and labor-intensive manual identification of ridge lines and trough lines, etc., to reduce economic losses and reduce personnel The effect of casualties

Inactive Publication Date: 2015-09-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, the MICAPS system for domestic meteorological analysis has not yet realized the automatic identification of ridges and troughs, and because the manual identification of ridges an

Method used

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  • Method for extracting and automatically drawing characteristic points of groove and ridge lines
  • Method for extracting and automatically drawing characteristic points of groove and ridge lines
  • Method for extracting and automatically drawing characteristic points of groove and ridge lines

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A method for feature point extraction and automatic drawing of ridges, see Figure 7 , the method includes the following steps:

[0047] 101: According to the trend of the ridge in the temperature / height field, the discretized meteorological grid point data with gradient directions of 0°, 45° and 90° are respectively used as candidate feature points of the ridge;

[0048] 102: Perform deviation correction and filtering on the ridge candidate feature points to obtain the final ridge feature points;

[0049] 103: According to the final ridge feature points, perform directional search to form a polyline, delete the ridges that do not meet the conditions, and obtain the filtered ridges;

[0050] Step 104: Smoothing the central axis of the screened ridges to obtain the final smooth ridges.

[0051] Among them, the steps of rectifying and filtering the candidate feature points of the ridge line to obtain the final feature point of the ridge line are as follows:

[0052] Fo...

Embodiment 2

[0062] 201: According to the trend of the ridge in the temperature field, the discretized meteorological grid point data with gradient directions of 0°, 45° and 90° are used as ridge candidate feature points;

[0063] The steps are specifically:

[0064] 1) Scan each meteorological grid point data, let (i, j) represent the position of each meteorological grid point data (i-th row, j-th column), let the data value on the meteorological grid point position (i, j) be Z i,j , for discrete grid point data, the difference is used instead of the differential, and f y and f x The calculation method of the third-order inverse distance squared weighted difference (the detailed steps of the calculation method reference 1 Chen Nan et al., 2007).

[0065] Among them, f y is the vertical difference value, f x is the horizontal difference value, Δy is the vertical increment, Δx is the horizontal increment, Z 1 = Z i-1,j-1 ,Z 2 = Z i-1,j ,Z 3 = Z i-1,j+1 ,Z 4 = Z i,j-1 ,Z 5 = Z ...

Embodiment 3

[0144]A method for feature point extraction and automatic drawing of groove lines, see Figure 8 , the method includes the following steps:

[0145] 301: according to the trend of the trough in the temperature / height field, the discretized meteorological grid point data with gradient directions of -180°, -135° and -90° are respectively used as candidate feature points of the trough;

[0146] 302: Perform deviation correction and filtering on the candidate feature points of the slot line to obtain the final feature points of the slot line;

[0147] 303: According to the final trough line feature points, search separately to form a polyline, delete the trough lines that do not meet the conditions, and obtain the filtered trough lines;

[0148] 304: Smoothing the central axis of the screened grooves to obtain the final smooth grooves.

[0149] Among them, the steps of rectifying and filtering the candidate feature points of the slot line respectively, and obtaining the final fe...

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Abstract

The invention discloses a method for extracting and automatically drawing characteristic points of groove and ridge lines, and the method comprises the following steps: enabling grid point meteorological data with 0-degree, 45-degree and 90-degree gradient directions after discretization to serve as the candidate characteristic points of the ridge line according to the direction of the groove ridge line in a temperature/height field; enabling grid point meteorological data with -180-degree, -135-degree and -90-degree gradient directions after discretization to serve as the candidate characteristic points of the groove line; carrying out the error correction and filtering of the characteristic points of the ridge line and the characteristic points of the groove line, and obtaining the final characteristic points of the ridge line and the final characteristic points of the groove line; carrying out beam search according to the final characteristic points of the ridge line and the final characteristic points of the groove line, forming a folded line, enabling the ridge and groove lines, which do not meet conditions, to be eliminated, and obtaining the selected ridge and groove lines; carrying out the smooth axis processing of the selected ridge and groove lines, and obtaining the final smooth ridge and groove lines. The method achieves the automatic detection of the groove and ridge lines, facilitates the forecasting of weather disasters, and reduces the economic loss and persons.

Description

technical field [0001] The invention relates to trough and ridge lines in the field of meteorology, in particular to a method for feature point extraction and automatic drawing of trough and ridge lines. Background technique [0002] Meteorological prediction mainly refers to the analysis of surface weather maps and upper-air weather maps, and draws contours and isotherms according to the temperature values ​​of different pressure levels, so as to show the distribution of weather conditions. The analysis of the temperature field is to judge the warm air at the bottom and the cold air at the middle and upper levels, and the analysis of the height field is to judge the low-pressure trough and the high-pressure ridge. The ridge line refers to the relatively narrow and long area extending from the high temperature area or high pressure area, that is, starting from the warm center or high pressure center, it is outlined along the maximum value of the isotherm or contour curvature...

Claims

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Application Information

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IPC IPC(8): G01W1/10G06K9/46G06T5/00
CPCG06T5/00G01W1/10G06V10/44
Inventor 王萍王苹苹闫春遐
Owner TIANJIN UNIV
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