J2EE MVC Based WebGIS And Related Spatial Data Indexing Research

WebGIS is the combination of GIS and Internet (WWW),It is an important means for geospatial information sharing in web. MVC(Model-View-Control) is a design pattern proposed by Xerox PARC in 1980' s. It reduces the degree of coupling between the objects involved in maintaining and presenting data by separating the logic layers and view layers. It not only makes the system flexible to develop but also raises its reusable ability.Spatial data is the main part of the GIS data system, constructing reasonable and efficient spatial indexing has an significant effect on the GIS system performance.In this dissertation, the author discussed the trend of GIS development, the concept of WebGIS, WebGIS characteristic, WebGIS implementing strategy and technology etc. Then by analyzing the problems existed in WebGIS, the author point out that traditional WebGIS is independent and isolated and there is no sufficient interoperability among different systems. All these problems hold back WebGIS development.To solve these problems, the author proposed a scheme: WebGIS based on Java technology and MVC design pattern. It has not only...