【摘要】 为了获取长江中上游地区高分辨率的降水情况,以长江中上游及其周围地区共613个气象站点的降水资料为基本数据,利用分辨率为4 km的DEM(Digital elevation model),采用了较适合地理信息系统(Geographic Information System)的插值方法,分别对该区域1992—2001年逐年降水进行了分析。结果表明:逐步插值法得到的高分辨率降水空间分布效果较好,计算的精度较高。该方法提高了计算的准确性,体现了降水随地形的变化以及在空间分布上的不连续性,有效解决了复杂地形条件下降水空间插值精度不高的问题。更多还原

【Abstract】 In order to obtain the precipitation distribution of high resolution in the upper-middle reaches of Yangtze River,this paper analyses the annual precipitation on the basis of the precipitation data of 613 meteorological stations from 1992 to 2001 with an interpolation method which adapts to the Geographic Information System(GIS).The result shows that the effect of the SIA based on the DEM of 4 km resolution is preferable.This method improves the computational accuracy,embodies the precipitation changes with topographty and the distributive incontinuity of precipitation,and solves the problem of the precision of the spatial interpolation of precipitation under complicated topographty condition.更多还原