考虑方向性的闪电分布REA模型及其图形显示

以密度分布图方式表示雷电地域性分布是气象信息网络发布中重要内容之一。文章针对栅格型闪电密度模型栅格剖分过于随意、缺乏连续性和光顺性等弊病,通过推导,引入表征面域法(REA),保证了在较大范围内闪电密度分布的连续和光滑;运用方差最大坐标旋转变换和椭圆面域处理技术反映闪电的方向性带状分布。从实例看,这种模型可以使闪电分布的物理本质和统计学特征得到较充分体现。

A directional REA model of lightning distribution and its graphical display

Regional lightning distribution information release in the form of density distribution is one of major contents of meteorological information network publishing.A method based on the Representative Elementary Area(REA),which can ensure the continuity and smoothness of lightning density distribution in a larger range,is introduced in order to avoid the disadvantages of raster maps,such as excessive arbitrariness,less continuity and smoothness.Maximum variance coordinate rotation and ellipsoid domain processing are used to illustrate the lighting zonal directional distribution.Application to a practical example shows that the REA model can fully embody the physical essence and statistic feature of lighting distribution.