In spatiotemporal database, geographicentity model includes spatial and temporal information of geographic object.
在时空数据库中，地理实体模型包括地理对象空间信息和时态信息。
2
The paper studies fuzzy characters about fuzzy geographic entities such as fuzzy point entity, fuzzy line entity and fuzzy surface entity, and discusses the representation about fuzzy entities.
对模糊地理实体的点实体、线实体和面实体的模糊性进行了研究，就它们的模糊表示进行了阐述。
3
In this scene system, Derive ocean geographic information database from actual electronic chart data, and according to these database build ocean terrain and entity model database.