Based On Multi-source Remote Sensing Information Webgis Design And Realization

Based on dissertaion of the brief history and status quo of the development ofWebGIS, the viewpoint that WebGIS is the impotent foundation of Digital Earth isproposed. Based on analysis of its function, WebGIS server is divided into three partsfor implementation:l. Metadata Server The geograPhic information data is mass data. so it isvery impotent to build a scientific data organiZation and managementmechanism. Based on the separae district and separate layer dataorganiZation scheme, a metadare management system is builL whichimplemented the management of and query based on metadam. ExPerimeniproves that organizing and managing GIS data in virtue of metadata isconvenient for the exPansion. update. query and aPplication of GIS data.2. GeograPhic Information Server Geographic information service is the coreservice of WebGIS. Separate layer display, three-dimensional display,zoom and stroll, inter-query of vector primitives and attribute dat4collection and edit of seif defined layer are implemented here. Theself defined layer not only conveniences users in aPplication, expands theaPplication range of the system, but also ensures the security and integhtyof the original data.3. User ServeL access control according to the identity of individual user isimplemented, which ensures the security of the system.WebGIS is designed and implemented in this thesis, as compared totraditional GIS, it implemented the communion of geograPhic information data andsoftware, avoided the installation and maintCnance of them on client computer, userscan get GIS data and service provided that they are on line. This advantae enduesWebGlS with very impotent practical value and broad application foreground.