Verification of Three-Dimensional Gridding Algorithm for Weather Radar Reflectivity

The reflectivity observation was analyzed to study the reliability of three-dimensional gridding algorithm during a precipitation process in Hainan on July 2, 2019, which acquired from CINRAD/SA weather radars located in Haikou and Dongfang. In this study, according to the nearest neighbor method in radial and the vertical linear interpolation method in azimuth, the volume-scanned reflectivity data of radar at Haikou in the spherical coordinate were interpolated into the longitude and latitude grids in the cartesian coordinate. The three-dimensional gridding reflectivity was verified by comparing its structural characteristics with the original volume-scanned reflectivity. The statistical errors between the three-dimensional gridding reflectivity and the volumescanned reflectivity observed from radar at Dongfang during the same period of time and in the common detection area were analyzed. The results show that the three-dimensional gridding reflectivity has a good continuity in space, and also retains the structural features of the original volume-scanned reflectivity data, and it is in good spatial consistency with the reflectivity observed from the weather radar in Dongfang city.