关键词: 槽线, 自动分析, 位势高度场, 格点分类, 曲率值追踪

Abstract: To solve the problems occurred in traditional trough lines analysis algorithms such as low efficiency and accuracy, an automatic algorithm of trough lines analysis is proposed. The algorithm obtaines trough lines using geopotential height field data through some steps. It is firstly to calculate curvature of contour lines where grid points locate, the grid points are classified into candidate and non-candidate trough points according to the curvature and relative?positions. Then, the eligible trough points identified among candidate trough points are tracked and connected. Finally, the analysis results of trough lines are obtained after post-processing steps, which mainly includes noise eliminating and curve smoothing. The experimental results show that the algorithm can recognize trough lines effectively, which is faster and more accurate than some other previous methods.

Key words: trough lines, automatic analysis, geopotential height field, classification of grid points, tracking according to curvature