面向时空特性的地理信息元数据组织方法

Method of organizing spatial-temporal geographic metadata

针对目前地理信息元数据管理与组织中存在的不能有效描述地理信息资源的时态性质,忽略资源的时效性和时空查询效率低的问题,面向时空特性,针对信息组织的合理性、时空检索的快速性和使用信息的时效性,提出了一种组织地理信息元数据的方法。首先采用时态可扩展标记语言(XML)元数据描述资源以达到描述、存储的合理性,提出地理信息资源时效性本体以定义时效性分类、关系和规则,然后利用HR-树索引时空信息以提高查询效率,最后给出应用实例,说明方法的可行性。实验分析表明,该方法能够有效考虑地理信息资源的时态性质,并显著提高资源检索的时空查询效率。

Concerning three issues in management and organization of geographic information resources:describing temporal attribute ineffectively,ignoring timeliness and inefficiency of spatio-temporal queries,focusing on rationality of organizing information,efficiency of spatio-temporal queries and timeliness of using information,a method of organizing geographic information metadata was proposed.Firstly,temporal Extensible Markup Language(XML)metadata was used to describe resources.Then timeliness ontology of geographic information resources was proposed to define timeliness categories,relations and rules.Afterwards HR-tree(Historical Rectangle-tree)was used to index spatio-temporal information.Finally,a case to show the method is practical was provided.Experimental results show that this method can effectively consider the temporal attributes of geographic information resources and significantly improve the efficiency of spatio-temporal query of resource retrieval.