Modern IT and 4~( th) GIS software
现代IT与第四代GIS软件

In this paper,some modern computer software techniques are introduced. However, those techniques can not be put into practice of GIS software design. Especially, spatial data distributed computation, combining query and operation of both spatial and attribute data are focused on. In this paper. The weaknesses of GIS implementation technique, like the spatial data modeling and storing, the completed framework of spatial relationship and declaration, the relationship presentation between the spatial data and the attributes are pointed out. Also, the technical directions to solve those problems are presented. The layer-based spatial data storing and operation model has to be changed. The synchronization mechanism of spatial data operation has to be established. The UNIX semantics of spatial data modification has to be implemented. The GSQL has to be researched so that the ability of spatial data administration can be increased. etc.