Method for automatically identifying south troughs by improved Laplace

The present disclosure discloses a method for automatically identifying south troughs by improved Laplace and relates to the technical field of meteorology. The method includes the following steps: acquiring grid data of a geopotential height field; calculating a gradient field of the geopotential h...

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Hauptverfasser: Li, Huahong, Wang, Yaqiang, Gan, Jianhong, Xiao, Tiangui, Wen, Xiaohang, Li, Chengchao, Zhang, Yongkai, Chen, Yan, Hao, Yanqiong, Shu, Hongping, Zhang, Tao, Ren, Juzhang, Zhang, Ying, Xu, Balin, Tao, Jingyi, Hu, Wendong, Shao, Jian, Zhou, Wenjie, Luo, Fei, Wang, Chao, Peng, Qiyang
Format: Patent
Sprache:eng
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Zusammenfassung:The present disclosure discloses a method for automatically identifying south troughs by improved Laplace and relates to the technical field of meteorology. The method includes the following steps: acquiring grid data of a geopotential height field; calculating a gradient field of the geopotential height field in an x direction; searching for a turning point where a gradient value turned from being negative to being positive, and cleaning the gradient field; calculating a divergence of the x direction to obtain an improved Laplacian numerical value L′; performing 0,1 binarization processing on the L′ to obtain a black-and-white image and a plurality of targets of potential troughs, merging the black-and-white image and the plurality of targets of the potential troughs by expansion, recovering original scale through erosion, and selecting an effective target through an angle of direction of a contour and an axial ratio.