基于元算法的GIS数学模型库系统设计

The design of GIS math-model base system based on meta-algorithm

现有的多数GIS系统中数学模型的创建模式单一、固定,已不能满足GIS发展对数学模型共享性、重用性、动态扩展和智能管理的需求。本文通过对模型库系统中模型的表示方法的研究,提出了"元算法"的概念,进而研究了GIS系统的元算法模型的分类和元算法模型之间的层次关系,并初步建立起"基于元算法的GIS数学模型库系统",实现了通过元算法模型和子算法模型之间的"聚合"生成新算法模型的功能。研究表明,这种建立数学模型库的方法能很好地实现对现有模型的管理,满足构建新模型的需求,从而为GIS提供强有力的算法支持。

Mathematic Algorithms were used in every part of GIS.However, with the development of GIS, existing organizing and managing methods of Mathematic Algorithms can't satisfy the developing need, especially in the sharing, expendability and flexibility of models.Through researching the methods of describing model, this article put forward a new concept called 'Meta-Arithmetic' which can instead of model granularity to increase the flexibility of models.Based on Meta-Arithmetic and the hierarchy between models organizing by Object Oriented approach, we research the classification of Meta-Arithmetic in GIS, then build a 'GIS Math-Model Base System Based on Meta-Algorithm', and introduce the processing of making a new Arithmetic Model integrally.Through studying, the conclusion is that, using Math-Model Base System to manage Math-Model is a effective method to manage arithmetic models,which is useful to realize the modularization and practicality of data- processing which GIS is dealing with.