【作者】 金培权； 周英华； 岳丽华； 龚育昌；

【机构】 中国科学技术大学计算机科学技术系；

【摘要】 <正>1引言时空对象和时空变化的表示和查询是时空数据库尤其是时空数据模型研究的基础。为了回答针对时空变化的查询,首先必须分析时空对象的时空语义,研究空间对象的时空变化类型、时空变化的表示更多还原

【Abstract】 The spatiotemporal semantics of spatiotemporal objects are systematically studied in the paper,and a new approach to the description of spatiotemporal changes is propounded,which is based on history topology and descriptor.The new approach describes spatiotemporal changes using object-level spatiotemporal changes and attribute -level spatiotemporal changes.The former is explicitly represented by history topology,while the latter is implicitly represented by descriptors.The presented approach overcomes the shortcomings of previous researches which lack in completeness and systematization,and guarantees the complete description of spatiotemporal changes in theory.更多还原