Design of Geographical Information Query Shell(GIQS)
地理信息查询外壳的设计

Based on analysis of traditional development models of project-oriented GIS,this pa- per proposes another model:shell model.Following the thought of“shell model”,a geo- graphical information query shell(GIQS) is developed.GIQS’implementation is intro- duced in detail,which includes system structure,main file types of GIQS,classification and encoding as well as the implementation of“two-direction multi-function query”.The in- dexing mechanism and“compressed tree-like binary search”greatly improve the efficiency of GIQS’functions.