【摘要】 GIS的数据组织在经历了CAD数据模型和Coverage数据模型两个阶段后,现已发展到对象关系数据模型阶段。该文阐述了采用对象关系模型的Oracle9iSpatial技术;分析了用VC++开发基于Oracle9iSpatial的GIS应用系统时,访问Spatial中空间数据的关键技术;并给出了实现代码。更多还原

【Abstract】 Unde rg one the stages of CAD data model and Coverage data model,GIS data organization has entered into the stage of object-relational model.Oracle9i Spatial is on e instance of this model.Basing on analyzing Oracle9i Spatial technology,thi s paper proposes some key techniques of reading spatial data from Oracle9i Sp atial,and lists the code segments.更多还原