摘要
以属性水平版本结构为理论基础,在空间数据表中,面状地物类表和线状地物类表是有效时间(Tv)和数据库时间(Td)的载体,事务时间反映版本创建时间(Tc),并将结点和弧段的版本改变记录到它们所属的面状地物类表中;属性数据表中,区分记录属性的连续变化与不连续变化。数据模型既体现了版本信息和时间要素,又减少了数据冗余。
Based on attribute-level versioning, the polygon feature table and linear feature table is the carrier of valid time (Tv) and database time (Td) in spatial data table. Transaction time reflects the creation time (Tc) of version. The change of nodes' versions and arcs' versions are recorded on the polygon feature table that includes them. According to the continuous and discontinuous change, attributes are noted separately in attribute table. This model not only expresses the version and time but also reduces the data redundancy.
出处
《测绘与空间地理信息》
2006年第2期52-53,57,共3页
Geomatics & Spatial Information Technology
关键词
版本化
时空数据模型
属性水平版本结构
versioning
spatio-temporal data model
attribute-level versioning