基于GIS的地灾预警降雨栅格数据自定义网格抽稀点方法实现

Research on implementation and interpolation of a custom grid extraction method

地质灾害预警系统中需要准确的研究区预报降雨栅格数据及生成方法,开发程序,借助于全区高程点进行子网格内高程点分层次随机抽稀,设置抽稀网格的大小及抽稀的比例,抽稀后的结果可进行人工补充剩余特征高程点;再根据已有监测站监测值,初步设定高程与降雨的关系,赋值降雨量,计算累加降雨,进行IDW插值生成预报降雨的栅格,根据不同的设置,将生成的预报降雨栅格与易发分区及历史灾害区域进行对比,判别最佳抽稀比例设置以生成最符合要求的预报降雨栅格。特点是程序快速抽稀,可控制度高,以少量更准确全面的点位获取更适用于研究区的降雨栅格,提高降雨预报的准确性,优化存取及处理效率,为降雨预报插值分析等应用提供一定的技术参考。

The geological hazard warning system needs more accurate forecast rainfall and grid garea,and develop process. With the help of the elevation points in the whole area,the hierarchical tion points in the sub grid is carried out. We can set the size of the grid and the proportion can be used to artilicial supplement the characteristic elevation points,according to the existing monitor data of of monitor sta-tions, handle preliminary setting of relations between height and rainfal,assigned rainfall and calculate cumulative rainfall,and then use IDW interpolation to get rainfall forecast,according to the dilferent settings,comparing the generated rainfall forecastgrid with prone area and historical disaster area, determine the best proportion of dilution to Characteristics is the rapid extraction of the program,The control system is high,with sive point of view to obtain more suitable for the study area＇s rainfall grid, improve the accuracy of rainfall forecast,optimizeaccess and processing efticiency. It provides some technical reference for the application of rainfall forecassts.