The Study And Construction On The Geo-spatial Framework Public Service Platform Of The Digital City

With the development of space information technology and its deeply application, "Digital City" has become the subject of urban inf ormatization construction. Along with the development of the societ y and economy, especially since reforming and opening-up, our cou ntry has achieved great achievements in every respects,but also faci ng new opportunities and challenges at the same time.So in order t o meet government comprehensive management efficiency and raise the level of public life, further improving the city informatization 1 evel appears especially urgent.While the construction of "Digital cit y" is its important constituent and forms, and the construction of " Digital City " in essence is to establish the city information servic e and sharing system,using the fundamental geographical spatial dat a as the core.In 2006, National SMC has launched "Digital City Geographica 1 Space Frame Construction Demonstration" project, This paper laun ched researchs on this background,and take digital ChangSha geo-sp atial frame construction project as a study case. The main contents researched in this paper are as follows:1.Based on analysis of Cha ngSha informatization present situation, Study and design the overall systematic frame, function structure and database structure of Chan gSha public service platform;2.Depending on the analysis of the bas ic geographic information data, using the ETL technological theory, according to the geographical entity extraction rule, Design data extr action, processing, substantiate algorithms;3.Analyze geocoding techn ology,Construct standard address model combined with the ChangSh a actual fact,and design the improved doorplate interpolation algorit hm based on existing matching algorithm;4.Analyze the basic princi pie of the tiles map technology, Realize the tile cut map and servic e releases of the geographical entity data.The primary research results of this paper are as follows:1.Ba sed on SOA structure concept, the paper have designed the architec ture structure, operation structure, function structure and database str ucture of the digital ChangSha geo-spatial framework public service platform.2.The paper have designed and achieved the data extracti on, processing algorithms and the improved doorplate interpolation a lgorithm, and the suitable conditions of the algorithm are given.3.Th e paper have realized tile map generation, update and service releas e, using the ArcGIS Server.4.Through invoking the data service,have realized the spatial query, spatial analysis, network analysis functio n of GIS.At last, through the performance test, it identified that the platf orm has reached the expected design requirement.