文献类型： 外文期刊
作者： Zhu, H. 1 ; Wu, H. 1 ;
作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China
2.China Natl Engn Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China
关键词： update information;spatial object;increment;spatial databases;temporal GIS;snapshot delta and semi-structure
期刊名称：JOURNAL OF SPATIAL SCIENCE （ 影响因子：1.981； 五年影响因子：1.893 ）
ISSN：
年卷期：
页码：
收录情况： SCI
摘要： To efficiently transmit the update of information by the incremental mode, the incremental update of spatial objects is redefined with a combination of the change process and corresponding snapshot delta. A formalization model for representing the snapshot delta is established. By mapping the snapshot delta with the corresponding change process, a typology of the increment which provides preconditions for extracting, representing and merging incremental change is given. A data modelling framework with low redundancy for organizing the increment is introduced. It is shown how useful increments can be queried from such a model using the LOREL query language. Finally, a simplified case study in the application domain of a topographical database update scenario is examined closely. It demonstrates that the new approach is more effective in specific scenarios when the change ratio of the spatial object is relatively low.
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