Research On Multi-Level Tile Data Updating Mechanism In WebGIS

With the development of WebGIS and the construction and use of digital campus in digital cities,it becomes more and more important to keep the current situation of geographic information data and efficiently update some data[1].However,the traditional data update method is usually put forward by the user,and the data maintenance personnel puts forward the work plan to the data department,which is finally completed by the data department.At least three departments and two delivery processes were involved,which virtually increased the operation and maintenance cycle.How to change the past manual whole map,slice inefficient method.Wthin certain limits of authority,it has become the primary task of platform data operation and maintenance to timely convert the changed data into electronic map and improve the efficiency and quality of electronic map operation and maintenance[2].In this paper,according to the characteristics of tile data,and combined with HTML,JavaScript scripting language,simulation to achieve the data measured in the field,draw and update to the tile map.Based on Visual Studio development environment,ASP.net test server for debugging,using IE browser for display and function.If this research method can be realized,it will not only provide ideas for tile data updating,but also have certain reference significance for the application of digital city.The specific work content is as follows:1.When the tile data needs to be updated,use the client control to read and modify the tile pixels,and process and save the tile data of different levels according to the line and column number of the tile.2.Point element,line element and polygon element:draw graphics with client controls,rasterize according to coordinates,find tiles of servers of different levels,and update and save the tiles involved in the server layer by layer and slice by slice by image processing technology.3.symbol elements,according to the size,shape,color,texture of the different design of different points,lines,surface styles,you can update the elements,choose the appropriate element symbol.4.Note elements:a black font with default size of 10px was designed.According to the input comment information and the position of mouse click,the comment information was updated to the tile and saved.Fig[31]Table[2]References[57].