以向日葵8号观测侦测过冲云的方法与实验

Methods and Experiments of Detecting Overshooting Top by Using Himawari-8 Imagery

本文以三种不同的方法,使用地球同步卫星向日葵8号的影像,进行侦测过冲云的测试,采用现有的水汽频道减红外窗区频道法与IRW-texture方法,并提供局地最小值法进行测试,此法结合上述二法的特点,但试图不要使用IRW-texture法中所需的数值预报的产品,且不要如水汽频道减红外窗区频道法,产生过多的过冲云像元。三个方法的实验结果与红绿蓝三色合成的侦测深对流产品、可见光和红外线色调强化影像比对,初步实验发现本文提供的局地最小值法是一个可行的尝试。

Detection of overshooting top experiments with three different methods has been conducted by using Himawari-8 data. We used the IRW-texture method and the algorithm based on different brightness temperature between water vapor and infrared window channel in this study. And we provided a local minimum method which combined the characteristic of both methods as men-tioned above. In this method, we tried to avoid using information from numerical weather forecast as in IRW-texture method. And we designed the method to minor false detection as the algorithm based on different brightness temperature between water vapor and infrared window channel. To estimate the accuracy of overshooting top detection algorithms, results from those methods have been compared with deep convection RGB image, visible image, and enhanced infrared imagery. In this primary test, the local minimum method shows its potential in detection of overshooting top.