Meteorological Information Publishing Platform Based on ArcGIS Server and VML Technique

In recent years, more extreme weather phenomena have caused great damages on people's lives and property. In order to guarantee the accurate quick society service of the weather information, the establishment of meteorological information platform is imperative.The system is developed using ArcGIS Server platform with ArcSDE, Oracle, combined with ASP.NET, VML, Ajax and other technologies. By integrating real-time weather information into actual GIS environment, the system delivers the basic operation of the map, the inquiry of dynamic information, and the visualization release of various statistical charts. Meanwhile, it will provide analysis of surface rainfall and typhoon affected area, by making full use of the GIS spatial analysis capabilities. When facing various complex weather, it shows the forecasters with a variety of weather information visually and quickly, supporting the decision-making, and it also provides better and more effective meteorological service for the public.The system consists of four layers. The first layer is the data storage layer, including the basis of meteorological data and geographic service data, which are stored in Oracle 10.2 database and ArcSDE for Oracle spatial database respectively. The second layer is the data service layer, including attribute and spatial data services, achieved by ArcGIS Server map services combining with the application services of DOTNET. The third layer is the business logic layer, it provides specific business logic processing and organization in accordance to client requests, achieved by the business module. The fourth layer is the clients' presentation layer, it provides all kinds of weather information dynamically and instantly through a friendly browser interface. The new techniques of Web 2.0, including EXT script libraries, Ajax and so on, bring the user new experience.ArcMap is introduced to manage mxd files and configure map document. Typhoon path displaying and buffer analyzing are based on the VML and ArcGIS Server interface. Contour surface rainfall analysis results can be overlaid with the raster of administrative map. Other key techniques include map services publishing, map cache generating, system deploying and load balancing, and so on.At present, this system has been on trial for more than one year in the Guangdong Provincial Meteorological Bureau, and has provided rich data for forecasters and other meteorologists. In particular, real-time data contour analysis, surface rainfall analysis, typhoon path buffer analysis and the raster overlay analysis of typhoon affected areas based on Geographic Model, have provided scientific basis for forecasting and decision-making, which is exactly the innovation of this system. Meanwhile, various statistical charts and diagrams of spatial analysis are great helpful to researchers. In addition, a variety of analysis charts can be used to check observation data, identify the site of wrong data quickly and amend the error in time. Based on user feedback, the system is under constant improvement.