分组平差是大地测量中一种常用的计算模型,是对大规模平差问题的一种分解,本身具有分布性的特征,适合于网格计算。本文首先通过对分组平差公式的分析,在几个步骤和层面上将其分解为若干子计算,然后提出子计算服务和子计算代理的概念,详细阐述了基本子计算、聚合子计算和工作流的概念,最后给出了并行工作流和串行工作流的实现途径。
Group adjustment is a common computation model. It is a decomposition of large-scale adjusment, which is distributable in itself and as a resuh suitable for grid computing. The paper first analyzed the equation of group adjustment and decomposed it into several sub-computations in different steps and levels. Then the paper put forward the concepts of sub-computation service and subcomputation proxy, explained the concepts of elementary sub-computations, aggregate sub-computations and workflow, and finally gave a way to realize the parallel workflow and serial workflow.