Visualization System Of WebGIS Based On DXF Data Source

AutoCAD,The Computer Aided Design Tool,has won the favor of the majority of users because of its simple operation,powerful function and friendly user interface.CAD software has been popularized for many years.In real life,the information of various domains,especially large-scale agricultural information,is generally stored in CAD format files.The wide application of CAD format also brings about the inefficiency of data acquisition and the difficulty of data sharing,which lead to a large number of idle CAD drawings.Therefore,it is urgent to design a system to ensure that the drawing information can be efficiently,accurately and reused in large quantities.In order to solve the above problems,taking DXF map of a farm as an example,this paper introduces the related methods of fast reading DXF map data,and combines the extracted data with the visualization of WebGIS.The agricultural GIS system based on DXF data source is proposed,because of some characteristics of WebGIS,such as no installation,easy maintenance,convenient data management and so on.This paper mainly studies the data visualized display and related operations in the front-end separation architecture of WebGIS.The following work has been done in this paper:(1)In order to quickly apply the data to the publication of WebGIS or graphics,this paper reads the data in the format of SVG.The program of reading DXF file data in C language is established systematically,the data information of graphic elements in DXF file is obtained by C language,and the program interfaces is encapsulated.(2)The data representation format of CAD and GIS for the same information are studied,and realize the conversion between the two formats.This paper combines GIS technology with CAD file,discusses WebGIS data visualization technology,and visualizes CAD data clearly and intuitively.Powered by the functions provided by AMAP Platform,the visualization of DXF data is implemented,and the operation function modules are implemented.(3)The association rule algorithm in data mining algorithm is used to analyze the acquired data and mine the strong association rules between graphic primitives.