中文摘要：

时间尺度是时空数据模型中重要的要素，决定着对地理信息刻画和描述的详细程度，在时空数据库中，时间粒度对于时空拓扑关系描述具有决定性的影响。该文对时间的基本元素进行了形式化定义，在数轴上把时间基于集合论划分为3部分，并对两个时间要素划分的集合求交，从而建立地理事件间的线性时间拓扑关系形式化描述的9交模型，在此基础上探讨了时间粒度变化对地理事件间线性时间拓扑关系的影响，并进行了实例分析。

英文摘要：

The time scale is an important element of spatiabtemporal data model which determines the level of detail to characterize and describe the geographic information, and in spatial-temporal databases time granularity has a decisive impact on the topological spatial-temporal relationship of geographical objects. In this paper, at first a formal definition of basic elements of time has been put forward, and then based on set theory the number axes can be divided into three parts according to the number of time of geographical event, based on the intersection of the sets of two-time elements a formal description of the 9 intersection model of the linear time topological relationships between geographical events has been established. On this basis the impacts of time granularity to topological relationships of linear time between geographic events also has been discussed with a case study.