The realtime datum, spatial topological datum, datum of facility property, and the function of operating the datum are enveloped in class of spatial entity, and then set up object of spatial entity.
将实时数据、空间拓扑数据、设备属性数据以及对这些数据操作的函数封装为空间实体类，建立了空间实体对象。
Finally, the time is signed on entity and record, and non-topological data model is adopted to organize spatial data.
时间标记在实体和元组级上，空间数据采用非拓扑数据模型。
Finally, the time is signed on entity and record, and non-topological data model is adopted to organize spatial data.
时间标记在实体和元组级上，空间数据采用非拓扑数据模型。
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