Of Webgis Theory And Openmap Source Analysis

Digit Earth, as the basic of the world-wide information system, has been accepted by the society. The interactive information operation operation, object-oriented software engineering, and the distributed computer technology, offer a solid technology foundation for building the WebGIS, one of the system plat for digital earth.According to the current geography information system and the definition of the digit earth, this paper firstly discusses about the function, the importance of the geography system, the history of the computer technology, and the current development of this geography information system. Secondly, some basic definitions and system structure are introduced. In this section, this paper also analyses this system in our country and points out that there are still a lot of work need to do. Then the paper discusses in detail about the comparison of the WebGIS and the traditional GIS, some detailed research on several system, and the resolution of some important problems. Analyses and comparison of some software on WebGIS are presented in this paper.The core of this paper is to analyze one open source code of WebGIS and one source code of Open Map system structure. From installation, compiler, to the catalog structure, all these are discussed in detail. Finally, from the view of engineering application, several development methods are presented. And this is a good way and efficient try on WebGIS.The following problems and resolutions are discussed in this paper:1. The use of the geography information system2. The structure of WebGIS3. The information promulgation of WebGIS4. The analyze of OpenMap source code for WebGISIn the final part, this paper gives an view for the development and application of the WebGIS.