It is a period of explosibility information. Especially for spatial information science, information can be acquired through many routes, such as man-made planet, aeroplane, laser, digital photogrammetry and so on. Spatial data sources are usually distributed and heterogeneous. In order to share and interoperate spatial data, federated database is the best resolution. In this paper, the concepts of federated database and interoperability are introduced. Three heterogeneous kinds of spatial data, vector, image and DEM are used to create integrated database. A data model of federated spatial databases is given.

介绍了新一代面向对象的GIS基础软件系统吉奥之星NT版的总体设计思想、系统结构、功能特点和有关关键技术。

With the increasing maturity of distributed object technology,CORBA,.NET and EJB are universally used in traditional IT field. However, theories and practices of distributed spatial database need farther improvement in virtue of contradictions between large scale spatial data and limited network bandwidth or between transitory session and long transaction processing. Differences and trends among of CORBA,.NET and EJB are discussed in details, afterwards the concept, architecture and characteristic of distributed large-scale seamless spatial database system based on J2EE is provided, which contains GIS client application, web server, GIS application server and spatial data server. Moreover the design and implementation of components of GIS client application based on JavaBeans, the GIS engine based on servlet, the GIS Application server based on GIS enterprise JavaBeans(contains session bean and entity bean) are explained.Besides, the experiments of relation of spatial data and response time under different conditions are conducted, which proves that distributed spatial database system based on J2EE can be used to manage, distribute and share large scale spatial data on Internet. Lastly, a distributed large-scale seamless image database based on Internet is presented.

讨论了基于互联网的地理信息组织与处理，提出一种分布式的跨平台的地理信息组织与处理方法，并讨论了它的软件实现。最后介绍根据这个思想设计的基于互联网的地理信息系统软件原型，以实例说明这种方法的可行性和优越性。

以矿山地质为背景，深入分析三维空间信息系统所涉及到的空间对象以及它们之间的联系，提出了几种新的空间对象类型。探讨用矢量与栅格混合的数据结构，以及面向对象的数据模型来表达各类三维空间对象，以此作为设计和建立三维地理信息系统的基础。