Design and Implementation of a Hierarchical Component-Based WebGIS
Ying Min Luo · Chinese Journal of Computers · 2004
A practical component based WebGIS model named as Geo Union is presented. Geo Union consists of four layers: storage layer, service layer, component layer and application layer. Service layer can be divided into another two layers: client service layer and server service layer. The architecture and object constitution of each layer in Geo Union are discussed in detail. After that, four key techniques adopted in Geo Union (Spatial data Model, ORDB, Spatial index and Spatial Cache) are summarized and analyzed. The Web application mode of Geo Union is also presented. At last, some future works in WebGIS, such as interoperability, security, distributed computing and intelligent computing, are indicated and simply explored.