基于FushionCharts与ArcIMS的统计制图与应用分析

随着Internet与WebGIS的迅速发展,WebGIS统计专题图应用越来越广泛。ArcIMS提供了一种制作统计专题图的功能,并通过网络进行发布的途径,但其统计专题图制作功能尚不完善。本文针对这一情况,介绍了一种FusionCharts图表组件与ArcIMS结合制作统计专题图的方法。该方法有两个关键技术点:第一是采用面向对象的技术,将源数据转化成FusionChart图表支持的XML数据格式这一过程封装成函数;第二是先将矢量地图与统计图表生成分开,矢量地图在服务器端生成,然后,调用已封装函数将每个图表所需数据转化成XML数据流并与矢量地图一起发送到客户端,最后,客户端flash插件解析XML并生成图表,与矢量地图叠加生成统计专题图。最后以北京都市型现代信息平台为例,对FushionCharts与ArcIMS结合制件统计专题图进行了应用,实践表明,此法相对于传统ArcIMS制作统计专题图不仅使用简单、生成的图表类型多样、动态而美观,且制图速度快。

Method of making statistics thematic maps based on FushionCharts and ArcIMS

With the rapid development of Internet and WebGIS,there are more and more extensive applications of the WebGIS statistics thematic maps in recent years.ArcIMS provides a way to make the statistics thematic map and releases it through the network,but its functionality is still not perfect.It can only provide two kinds of charts,i.e.pie and column charts,the type is very limited,and the aesthetics is not strong.What＇s more,as the feature-map and statistical thematic chart are generated on the server side at the same time and then transfered to the client side,so the load of server is high and network transmission is slow.The aim of this study was to provide a new method for making statistical thematic maps using ArcIMS combined FushionCharts,which is a chart component.The author refered to nearly 40 kinds of SWF files provided by FusionCharts,wrote a class which was used for converting the data＇s format into xml,then sended the SWF file and XML to the client,analysed through the flash plug-in of the client to generate statistical thematic chart,used the spatial geological place points coordinates,overlaid to feature-map which was made by ArcIMS on the server side to form the statistical thematic maps finally.This method generates the feature-map and thematic statistical chart on the server and client side,respectively.Compared with the traditional methods using ArcIMS only,it has a more simple production process;includes nearly 40 kinds of beautiful,highly interactive types of statistical thematic charts,making the form of charts abundant and visual,meeting the user＇s requirements more fully.In addition,it generates the feature-map on the client side separately,without the generation of thematic statistical chart formed on the server,so it is a good way to reduce the load of the server,making double the speed of network transmission.At last,a specific example of using this method is given,showing that it can make multiform,dynamic and good looking statistical thematic maps easier and faster.