Research on boundary extraction and fitting analysis for convective clouds based on rerouting strategy

The method of boundary extraction of convective clouds was theoretically studied on the basis of image processing and model fitting evaluation theory, with the help of Doppler weather radar echoes. Ellipse and convex polygon was used to fit the extracted boundary of those clouds whose areas are big enough for flights to reroute. The evaluation results show that polygon fitting method is better than ellipse. And the accuracy gradually decreases with the increasing of length-width ratio of clouds. On the contrary, the redundancy gradually increases. In ellipse fitting method, the deviation degree also increases when the length-width ratio increases, while, the value is constant in the method of polygon fitting.