期刊
ATMOSPHERE
卷 8, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/atmos8030048
关键词
rainfall; nowcast; motion tracking; optical flow
Hong Kong Observatory has been operating an in-house developed rainfall nowcasting system called Short-range Warning of Intense Rainstorms in Localized Systems (SWIRLS) to support rainstorm warning and rainfall nowcasting services. A crucial step in rainfall nowcasting is the tracking of radar echoes to generate motion fields for extrapolation of rainfall areas in the following few hours. SWIRLS adopted a correlation-based method in its first operational version in 1999, which was subsequently replaced by optical flow algorithm in 2010 and further enhanced in 2013. The latest optical flow algorithm employs a transformation function to enhance a selected range of reflectivity for feature tracking. It also adopts variational optical flow computation that takes advantage of the Horn-Schunck approach and the Lucas-Kanade method. This paper details the three radar echo tracking algorithms, examines their performances in several significant rainstorm cases and summaries verification results of multi-year performances. The limitations of the current approach are discussed. Developments underway along with future research areas are also presented.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据