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5}| Z8`(['@;R00 引言城市空间基础数据是GIS应用系统的血液。就GIS软件本身而言 ,不同的软件厂商根据自己对GIS的理解、某些用户的需求和自己的技术水平 ,为图形数据设计了一套数据结构和数据模型 ,这种数据结构和数据模型对某一系统来说固定不变 ,而对整个GIS世界而言却是杂水利论文.w3G vS i,X e d

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