Design And Research Of Multi-source History Spatial Data Display Platform Supported By MAPGIS

The three-dimensional history of multi-source spatial data integrated display platform that based on the Internet is not mature now, so how to The history of multi-source spatial information platform that can be accessed through Web browsing is the main target of this article. The thesis makes a design of display platform; some of the key technologies are studied, and finally verified by an example.The platform designed to show the historical changes of cities by showing the image data of different historical periods, and show the historical architectural details intuitively by 3 d models. Besides, it will realize some practical functions such as retrieval and path analysis. Due to the characteristics of multi-source data, there is much difficult to implement. To show the changes of history, the image data must have high resolution, it will reduce the speed of data processing; the platform involves multi-source spatial data, so the storage and read of it is completed; the image data with location information does not have attribute information, so it cannot associated with the point of interest(POI); the 3 d model created by the external software do not have space attribute information, cannot be published accurately. Besides, all data are published and accessed through the Web; the big data transmission will lead to many problems.In view of the actual demand of the platform, the theses summarized some related technologies about the organization and publish of spatial information data, and deeply studied in several key technologies. Put forward the “multi-servers distributed tile cutting technology", introduced the concept of distributed in tiles cutting, improved the efficiency of the data processing; using multistage cache mechanism, by opening up the cache files in the client and create three-dimensional model queue in the server, improved the utilization rate of the data, and reduce the network transmission of data; implements the unification calls of the multi-source data by using API of JCR content repository, improve the efficiency of data retrieval and read; realized the spatial retrieval based in image data by creating vector model, and published the 3d model accurately by recordings the coordinates of target location in XML.Finally take Beijing for example, implement the platform in Map GIS, put the theory into practice.