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5.结语
本文根据作者多年研究开发三维GIS的经验体会，回顾评述了三维GIS的特点与相关软件发展情况，同时指出三维GIS的发展一方面面临着完整的三维数据模型和数据结构的缺乏，数据获取及大数据量存贮和处理上的困难，三维空间分析能力薄弱等困难，另一方面又面临着科学计算可视化理论技术、数据库系统管理技术、数字影象处理技术和二维GIS长期发展提供的理论实践经验等有利因素。文章最后也为三维GIS实际系统的开发提出了几个值得注意的要点。
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