计算网格下的高性能MODIS蒸散发反演研究

An Approach for MODIS Evapotranspiration Inversion with High Performance Based on Computational Grid

针对MODIS蒸散发反演运算效率不高的问题,提出一种基于计算网格技术的并行处理方法,以提高水文预报的精度和时效.通过给出原子的形式化定义,将蒸散发反演算法拆分为可在网格上调度执行的原子;建立标准化的参数引用关系和编排机制,形成基于地球表面能量平衡原理的反演作业图;根据作业拓扑结构和节点状况,以细粒度方式加以调度.实验表明,该方法具有良好的高性能特征,反演速度快、稳定,并可合理地利用计算力资源.

According to the inefficiency of MODIS evapotranspiration inversion,aparallel processing method is proposed based on computational grid to improve the accuracy and timeliness of hydrological forecasting.A formal definition of atom is given,and then the MODIS evapotranspiration inversion algorithm is split into atoms that can be scheduled and executed on grid.Standard relations and arrangement mechanism of parameters are established and the inversion task graph is constructed based on the principle of the earth＇s surface energy balance.The schedule of the task is made by particles with small size,task topological structure and node state.Experimental results show that the algorithm has good characteristics of high-performance,fast and stable inversion,and reasonable use of node computing resources.