Abstract: This paper firstly discusses the advantages of version management based on ArcSDE under multi-user edit, and proposes three concepts of “conceptional layer”, “middle layer” and “physical layer”, and then points out the version, state and table are the kernal concepts of the three layers respectively. Then the authors analyze the principle of version management from the three levels deeply. A new method of spatial data access for the spatial data after muti-user edit given, of which idea and implement are also discussed. The results of experiments demonstrate that it is feasible and practical.

Key words: spatial data, version management, GIS, ArcSDE

摘要： 首先指出多用户编辑下ArcSDE版本管理的优势，提出概念层、中间层和物理层的概念，指出版本、状态和表分别是这三个层次上的核心概念，并分别从各个层次上深入分析了ArcSDE版本管理机制的实现原理。然后提出了一种新的ArcSDE版本管理中多用户编辑后空间数据访问方法，阐述了其思想和具体实现算法，最后以试验证实了其可行性和实用性。

关键词: 空间数据, 版本管理, 地理信息系统, ArcSDE