【摘要】 在地图数据库系统应用中,有特写与漫游的操作需求。本文提出了支持特写与漫游操作的新型数据类型X属性与A属性,建立了它们的数学模型,包括一个显式的矩阵模型和一个隐式的层次网格逻辑模型,并讨论了X属性与A属性的实现技术。更多还原

【Abstract】 In applications of map database system, closeup and roam operations are important. This paper presents two new data types, namely, X-attribute and A-attribute, to support closeup and roam operations. We establish two mathematie models for X-attribute and A-attribtite. One is a matrix model, another belongs to hierarchical cellular logic models. Finally, implementation, techiniques Of X-attribute and A-attribute are also discussed in detail.更多还原