THE RECOGNITION AND TRACKING OF SEVERE CONVECTIVE CLOUD FROM IR IMAGES OF GMS

Bat Jie; Wang Hongqing; Tao Zuyu

Abstract:

It is very important to locate and track weather systems which cause severe calamity,such as severeconvective clouds(SCC),in nowcasting. In this paper the recognition and tracking of SCC is studied with GMS IR images using computer image techniques. As an IR image preprocessing, a SCC futerlng algorithm is put forward that combines a segment smoothing filtering and a removal procedure by thresholds. To the filtered SCCs the T algorithm and IP algorithm of contour coding method are applied to extract the contour line and its initial point. The description of SCCs includes four characteristic quantities, i. e. center of gravity, cloud size, moment invariant M and R-shaped descriptor. Pattern recosnitionand pattern matching techniques are used to track the SCCs. Two procedures of rough and fine matchingare given. The former procedure include the setting of searching area and recognition of area and the latter is composed by the matching of shape descriptor R and moment invariant M and the analysis of correlative brightness temperature analysis.

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Bat Jie, Wang Hongqing, Tao Zuyu. THE RECOGNITION AND TRACKING OF SEVERE CONVECTIVE CLOUD FROM IR IMAGES OF GMS [J]. Journal of Tropical Meteorology, 1997, 3(2): 192-201.

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THE RECOGNITION AND TRACKING OF SEVERE CONVECTIVE CLOUD FROM IR IMAGES OF GMS

Laboratory for Severe storm Research, Department of Geophysics, Peking University, Beijing 100871

Received Date: 1995-07-24

Rev Recd Date: 1995-12-25

Abstract: It is very important to locate and track weather systems which cause severe calamity,such as severeconvective clouds(SCC),in nowcasting. In this paper the recognition and tracking of SCC is studied with GMS IR images using computer image techniques. As an IR image preprocessing, a SCC futerlng algorithm is put forward that combines a segment smoothing filtering and a removal procedure by thresholds. To the filtered SCCs the T algorithm and IP algorithm of contour coding method are applied to extract the contour line and its initial point. The description of SCCs includes four characteristic quantities, i. e. center of gravity, cloud size, moment invariant M and R-shaped descriptor. Pattern recosnitionand pattern matching techniques are used to track the SCCs. Two procedures of rough and fine matchingare given. The former procedure include the setting of searching area and recognition of area and the latter is composed by the matching of shape descriptor R and moment invariant M and the analysis of correlative brightness temperature analysis.

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Reference (12)

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THE RECOGNITION AND TRACKING OF SEVERE CONVECTIVE CLOUD FROM IR IMAGES OF GMS

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