| 1. | This paper introduces the concepts and theory of sde ( spatial data engineer ) , and presents some key technologies , such as the model of sde , the efficiency of sde , data consist of multi - user edit , etc 摘要介绍了空间数据引擎的概念和原理,剖析了空间数据模型、引擎效率、多用户编辑的数据一致性、多数据源支持等空间数据引擎的关键技术。 |