Trough line automatic drawing method based on geopotential height data in computer weather software

Abstract

The invention discloses a trough line automatic drawing method based on geopotential height data in computer weather software. The method can realize automatic extraction and drawing of weather trough lines in a weather map, and comprises the following steps: calculation of a curvature value: calculating geostrophic velocities of each grid point in the latitude and longitude directions, obtaining a wind angle of geostrophic wind at the grid point based on the calculation, and deriving the wind angle of the geostrophic wind in the wind velocity direction, thus obtaining the curvature value; tracking of trough points: extracting a local curvature minimum value which is used as a trough line tracking start point, and tracking and connecting the trough points from the trough line tracking start point according to constraint conditions such as the quantity of adjacent points with relatively small curvature values of all the grid points, thus obtaining an original trough line; processing of the original trough line: eliminating noise from the extracted original trough line, and performing smoothing processing, thus generating a trough line meeting a meteorological service demand.

Description

technical field [0001] The invention relates to a method for automatically drawing trough lines based on geopotential height data in computer meteorological software. Background technique [0002] The research content of the middle and upper atmosphere mainly includes contours, isotherms, humidity fields, trough lines and shear lines, as well as temperature advection and humidity advection. Among them, the analysis and drawing of various contour lines such as contour lines and isotherm lines can basically be automatically realized by computer. However, at present, the analysis of high-altitude troughs mainly relies on manual implementation. On the one hand, the workload of manual analysis and drawing is relatively large, and the efficiency is relatively low; The difference will have an impact on the analysis results of the groove line, which is not conducive to improvement and popularization and application. [0003] At present, the common automatic trough line extraction ...

AI Technical Summary

Problems solved by technology

However, at present, the analysis of high-altitude troughs mainly relies on manual implementation. On the one hand, the workload of manual analysis and drawing is relatively large, and the efficiency is relatively low; The difference will have an impact on the analysis results of the groove line, which is not conducive to improvement and promotion.

[0003] At present, the common automatic trough line extraction analysis mainly focuses on the extraction of ridge and valley lines in terrain data and the trough line extraction of fingerprint graphic data. These algorithms are proposed for the characteristics of related fields. There is a big difference in the analysis of , and it cannot be fully applied to the analysis of meteorological troughs

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