| 基于分层子网的时空索引机制 |
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| 作者单位： | 武汉理工大学资源与环境工程学院，武汉大学资源与环境科学学院 |
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| 摘 要： | 目前,已有的时空索引机制主要考虑时空对象,缺乏对显式表达的时空关系的索引,不便于因果关系查询,降低了图论时空模型的实用性。这里扩展了图的数学概念,提出了时空图的分割策略,构建了基于分层子网的时空索引机制,实现了时空对象与时空关系索引的一体化,增强了基于图论的时空数据库的灵活性,有利于因果关系的查询。
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| 关 键 词： | 子图 时空索引 时空数据模型 |
Spatiotemporal Indexing Mechanism Based on Sub-net in Layers |
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| YIN Zhang-cai,LI Lin. Spatiotemporal Indexing Mechanism Based on Sub-net in Layers[J]. Journal of Institute of Surveying and Mapping, 2008, 0(5) |
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| Authors: | YIN Zhang-cai LI Lin |
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| Affiliation: | YIN Zhang-cai1,LI Lin2 |
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| Abstract: | Indexing technology is the key part in database system.The spatiotemporal objects have been taken into account in existing spatiotemporal indexing methods,which are short of explicit spatiotemporal relationship.Hence,it reduces the practicability of the spatiotemporal data model based on graph.In this paper,a new indexing mechanism,based on sub-net in layer,was presented,where the spatiotemporal objects and relationship were both indexing items.Thus,the efficiency was improved based on the relation between cause and effect. |
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| Keywords: | sub-net spatiotemporal index spatiotemporal data model |
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