一种基于GIS的预报降雨栅格动态生成方法初探

中国大部分地区的降雨监测点位布设稀少且分布不均,特别是大区域的降雨监测和预报存在着不准确现象。利用GIS技术,以都江堰市为研究区,结合降雨随海拔变化规律与实测降雨数据,初步建立了降雨随海拔高度变化的二次曲线计算公式和等高线对应转折拐点降雨图层,参考对比自定义降雨矩阵点图层生成的预报降雨栅格效果,最后在基于AE开发的山地平原过渡区土地生态安全预警系统中,依据等高线拐点降雨图层动态生成研究区降雨栅格,作为该系统下预警指标动态监测模块的主要指标因子,初步解决了研究区降雨监测点位少的情况下,全区预报降雨可视化程度低和局部预报准确度不高的问题,有效地提高了降雨预报的准确性和直观性。

A Grid Dynamically Generated Method and Preliminary Inquiry for Rainfall Forecast Based on GIS

Rainfall in most parts of China laid monitoring sites scarce and unevenly distributed, especially in large areas of rainfall monitoring and forecasting inaccuracies phenomenon exists. Using GIS technology to Dujiangyan City, as the study area, combined with the altitude variation of rainfall and measured rainfall data, the initial establishment of rainfall variation with altitude quadratic formula and the corresponding contour turning inflection point rainfall layers, refer to the contrast from define the matrix point layer generated rainfall forecast rainfall raster effects, and finally the development of mountain plains based on the AE transition zone land ecological security early warning system, based on the layer contour inflection point rainfall rainfall grid dynamically generated in the study area as part of the system under dynamic monitoring of early warning indicators module's main index factors, has initially solved the rainfall monitoring sites in the study area few cases, the region and the local visualization forecast rainfall forecasting accuracy is not high, effectively improve the accuracy of rainfall forecasts intuitive.