多普勒雷达资料的网格化研究  

Study of the Doppler Radar Data Gridding

作　　者：邹海波[1,2] 单九生[1,2] 邓诗茹[2] 

机构地区：[1]江西省气象灾害应急预警中心,江西南昌330046 [2]江西省气象科学研究所,江西南昌330046

出　　处：《气象与减灾研究》2014年第2期23-30,共8页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金项目(编号:41265003);灾害天气国家重点实验室课题(编号:2013LASW-B14)

摘　　要：阐述了多普勒雷达体扫资料或雷达产品资料的网格化流程和步骤,对网格化过程中所面临的资料插值(临近法和双线性插值法)、坐标转换(直角坐标系与极坐标系的转换)、格点位于弧底梯形的判断以及GrADS软件中地图投影等问题进行详细的分析和研究。此外,还对比分析了临近法和双线性插值法网格化的雷达回波资料,其结果表明这两种方法都能较好地对极坐标系下的雷达回波资料进行网格化,但临近法网格化的雷达回波资料尽可能地保留了雷达体扫资料中原有反射率的结构特征,而双线性插值法网格化的雷达资料其弱回波区(<25 dBz)的范围有所扩大。This paper describes the method and process of gridding Doppler radar data. The process of data interpolation,the coordinate conversion between polar coordinate and rectangular coordinate,the judgment of trapezoidal points located at the Arc bottom and the map projection using GrADS software are analyzed and investigated. In addition,this paper also comparatively analyzes gridded radar data from adjacent replacement method and bilinear interpolation method,the results show that both the two methods can illustrate the main structural features of radar volume scan data,but the former can as far as retain the original structure features of radar volume scan data,and the latter expands the region of weak echo（25 dBz）.

关 键 词：雷达资料 网格化 坐标转换 射线法 地图投影 

分 类 号：P413[天文地球—大气科学及气象学]