基于地块的时态地籍数据库数据结构的研究

根据地块特性,对时态地籍数据进行了详细分类,在此基础上,针对基于关系模型的时空数据结构的不足,提出了改进措施:建立专门的索引表———时态数据表,除时态数据表加入起始日期、变更日期外,其他属性表不用加入时间标记,空间数据结构采取基于多边形的矢量数据结构。以时态数据表为核心关联链表,以宗地号为公共字段,将宗地的各时态空间数据和属性数据有机结合起来,降低了数据的冗余性,优化时态连接,有效地描述了基于地块的地籍变更过程,达到了历史数据和当前数据双向查询的效果。

Research on data structure of temporal cadastral database based on the land parcel

According to the characteristics of land parcel,the temporal cadastral data are categorized concretely.Following this,the improved measurement of data structure are suggested in order to avoid the shortages of spatio-temporal date structure based on relational model:the specialized index table——temporal datasheet is designed,except for temporal datasheet,the other attributive datasheets need not to be added temporal sign,the vector data structure based on polygons of the spatial data structure is provided;the temporal datasheet is regarded as a core related table and the land parcel number is regarded as public field,by which,every kinds of spatial data and attributive data of land parcel are related together effectively,the redundancy of data is reduced and the temporal linkage is optimized,the cause of cadastral alteration based on land parcel is described effectually,and realize the bidirectional query between historical data and present data.