GridRad - Three-Dimensional Gridded NEXRAD WSR-88D Radar Data
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The GridRad data set consists of radar reflectivity data and radar coverage information from 125 U.S. NEXRAD WSR-88D radars merged onto a regular, three-dimensional, longitude-latitude-altitude grid at hourly analysis intervals. Each analysis uses all available radar azimuth scans within a specified time window centered on the analysis time. The size of the time window is given in the files as a global attribute. The data include weighted average radar reflectivity from multiple observations, averaging weights, number of azimuth scans (elevation angles) observing each volume, and the number of azimuth scans (elevation angles) with echo in each volume. Following conventional nomenclature, the NEXRAD volume scan files are referred to as Level 2 data, while this gridded data are referred to as Level 3 data. Additional information is available at GridRad.org [http://GridRad.org].
GridRad数据集包含了来自125个美国NEXRAD WSR-88D雷达的雷达反射率数据和雷达覆盖信息，这些数据被整合到一个规则的三维经纬度高度网格中，分析间隔为每小时一次。每个分析都使用在分析时间点周围特定时间窗口内所有可用的雷达方位扫描。时间窗口的大小作为全局属性包含在文件中。数据包括多个观测的加权平均雷达反射率、平均权重、观察每个体积的方位扫描数（仰角）以及每个体积中带有回波的方向扫描数（仰角）。依照传统命名法，NEXRAD体积扫描文件被称为第2级数据，而此网格化数据则被称为第3级数据。更多详细信息可在GridRad.org网站（http://GridRad.org）获取。
