【摘要】 一库多用是GIS处理海量数据的有效方式。一库多用要求GIS能够从大比例尺数据生成小比例尺数据,这就要求GIS具备数据自动综合功能。GIS数据综合的关键是建立规则库,实现不同用户对规则库的自定义,以提高系统GIS数据自动综合的的通用性。GIS数据自动综合是计算机遵循的一定规则,对各个记录进行一一处理的过程。本研究基于产生式知识规则表达方式,提出"预存储规则"的实现方法。首先,最大量地收集与某一专题相关的所有知识规则,建立专题规则库;然后,根据相应的需求,在该专题规则库的基础上,通过用户接口定义不同应用规则库。该方法在一定程度上实现了程序与规则的分离和规则库的自定义。最后,给出了原型实验系统。更多还原

【Abstract】 GIS is now used in more and more fields.It is required that GIS should be equipped more function.People desire that the geo-data visualization should be with multi-angle,multi-point and multi-level.So GIS must be equipped with automatic data-generalization function.GIS relies on a rule database to realize automatic data generalization.In this paper we suggest that automatic data generalization is a process using a computer to process every database record according to the rules.Based on the production-rule method,this paper proposed a method named Rules Pre-stored to enable users to define application rule database.According to the method,a GIS application first builds a thematic rules database which includes all the rules with respect to a specific theme.The rules database is called the theme rules database.Different users of the theme could define their own special application rule database based on the theme rules database through the user interfaces.A demonstration was also given.To some extent,the self-defined rule database and the separation of code and rules were accomplished.The result shows that the research idea and technical route are feasible.更多还原