Integrating Spatial Decision Support Models Based on Knowledge
基于知识的空间决策支持模型集成

In the Spatial Decision Support tool System (ISAT), rules of expert system are expanded so that the expert system can not only use data extracted from GIS and database, but also need decision support models. By using these broad sense rules, we can bring knowledge process in geographic analysis, and integrate GIS, database and spatial analysis model. Model Data Blackboard is the key of integration, which consists of a variable table, a model table a true value maintaining system and a blackboard monitor. By this approach we can incorporate mathe models one by one. The system is also based on fuzzy-logic. Model Data Blackboard can manage precision data and fuzzy data, and the mathe model functions exchange data between them through the model data blackboard. By prescribing the principle about computing certainty factors, certainty is processed approximately.