Chengdu University of Information Technology

Chengchao Li

Yan Chen

Fei Luo

Chao Wang

Tao Zhang

Tiangui Xiao

Wenjie Zhou

Jianhong Gan

Wendong Hu

Yanqiong Hao

Jian Shao

Hongping Shu

Jingyi Tao

Balin Xu

Ying Zhang

Huahong Li

Xiaohang Wen

Juzhang Ren

Yongkai Zhang

Yaqiang Wang

Qiyang Peng

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.

Method for automatically identifying south troughs by improved Laplace

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Chengdu, China

Chengchao Li