一种利用FY-2卫星数据的台风中心定位方法

A Method of Typhoon Center Positioning Using FY-2 Satellite Data

针对台风监测中无眼台风的中心定位不够准确的问题,提出一种利用风云2(FY-2)卫星数据的可同时适用于有眼台风和无眼台风的自动台风中心定位方法。该方法首先计算FY-2卫星图像中每个点的梯度值;然后绘制梯度向量的平行线并计算交汇次数存入密度矩阵中,计算得到的密度矩阵中的最大值即为台风中心的初步估算位置;最后使用高斯滤波进行亮温修正进一步确定中心位置。通过分析多个发源于热带海面的台风,并与中国气象局(China Meteorological Administration,CMA)发布的最佳路径数据集以及其他方法进行比较,证明了所提方法能够准确地确定台风中心位置。该方法可以自动检测台风中心并能代替传统的人工定位方法。

In order to address the problem of inaccuracy in center location of the no-eye typhoon in typhoon monitoring,a novel method is developed for the automatic detection of the center of typhoon using FY-2 satellite data.The method can be applied to both the typhoon which has eye or non-eye.Firstly,at each point in the image,the gradient magnitude can be calculated using the presented method.Next,lines parallel to the gradient vector at each pixel are drawn across the analyzing scene in the image.The points where these lines intersect each other are stored as a score in the density matrix,and the maximum value in the density matrix is the initial position of typhoon center.Finally,a Gaussian filter is constructed to correct brightness temperature for determining center of typhoon.Several typhoons formed in tropical seas were analyzed in this study.Experimental results were compared with the optimal path given by China meteorological administration(CMA)and other methods,demonstrating that the proposed method can determine the location of typhoon center accurately.The present algorithm has a potential to be applied in an automated mode and can be used to replace traditional manual center determination.