云南区域站降水资料利用Surfer软件实现Cressman插值的研究

Research on Cressman Interpolation using Surfer Software based on Precipitation data of Yunnan Regional Station

针对云南区域站大密度站点的插值问题,结合Surfer插值工具,探讨ECMWF高分辨网格下云南区域站降水资料的合理插值方案。利用Surfer平台自带的插值工具绘制云南区域站降水图,采用Cressman插值方法,设计不同的扫描方案,并基于Surfer平台绘制同一天的区域站降水图。结果表明,基于Surfer软件平台可以间接实现Cressman插值;逐级扩大的扫描方案(0.0625°、0.125°、0.34°),相比而言更适用于站点稀疏的地区;而在站点密度高的区域,使用较小的(0.0625°)扫描半径,插值效果更好。总体来看,Cressman的插值结果要优于Surfer软件平台自带的插值方法,尤其是0.125°和0.0625°这两种插值方案,对站点资料的还原度更高。

Aiming at the interpolation problem of large density sites in Yunnan regional stations,combined with Surfer interpolation tool,the reasonable interpolation scheme of rainfall data in Yunnan regional stations under ECMWF high resolution grid is investigated. Firstly,the interpolation tool provided by Surfer platform is used to draw the precipitation map of Yunnan regional station. After that,by using Cressman interpolation method,different scanning schemes were designed and the precipitation maps of the stations on the same day were drawn based on the Surfer platform. The results show that the Cressman interpolation can be realized indirectly based on the Surfer software platform. The scaled-up scanning scheme（ 0.0625°,0.125°,0.34°） is more suitable for the sparsely populated areas than that in the station. In the area with high site density,the interpolation effect is better with a smaller scanning radius（ 0. 0625°）. Generally speaking,Cressman＇s interpolation result is better than that of the interpolation method provided by Surfer software platform,especially interpolation of 0.0625°,0.125° and 0.0625° program,the restoration of the site data are higher.