1.ArcGIS API for Flex用GeoprocessingServices实现网络分析中的服务区分析,本例子根据driveTimes值分析出在指定时间内的区域范围情况,效果图中有内到外分别是1分钟、2分钟、3分钟的行车区域范围情况。
准备工作:
1.本来例子采用的数据是SanFrancisco数据(ArcTutor\GP Service Examples\DriveTimePolygons),在ArcGIS.Server.9.3发布一个叫SanFranciscoBasemap的Map Service(SanFranciscoBasemap.mxd)。
2.在ArcGIS.Server.9.3发布一个叫DriveTimePolygonsService的Geoprocessing Service,关于Geoprocessing模型的制作以及Geoprocessing Service的发布设置请参考http://webhelp.esri.com/arcgisserver/9.3/java/index.htm#geoprocessing/guide_-1963186772.htm页面中的Example了,讲述的很详细了。
完成后的效果图:
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开始:
1.首先对Geoprocessing Service进行一下介绍,从ags9.2开始可以将ArcTool 做为GeoProcessing service发布,在ArcGIS Server中使用,这样就能借助ArcTool为ags提供非常强大简单好用的功能,如buffer分析、网络分析、数据裁剪....等等。Geoprocessing Service发布后可以提供给不同的客户端使用如Web Mapping Applications, ArcGIS Explorer, and ArcGIS Desktop,在ags9.3中GeoProcessing service也同时通过rest api的方式提供给客户端进行编程使用,在flex api、javascript api中由于不能直接像Web Mapping Applications一样直接通过调用Ao的方法实现复杂的功能,这样GeoProcessing service就显得非常的有用了,它为flex api、javascript api提供了实现复杂功能的途径如buffer分析、网络分析等,当然buffer分析可以还可以用GeometryService实现了前几篇中有详细的讲解了。
2.介绍完启动GeoProcessing service的概念接下来用GeoProcessing service实现网络分析中的服务区分析为实例来讲解GeoProcessing service在flex api中的应用。
3.启动Flex Builder3新建工程以及引入1.0正式版的ArcGIS API for Flex library的开发包。
4.新建ServiceAreaGP.mxml页面,添加Map、ArcGISDynamicMapServiceLayer、GraphicsLayer等并且设置相应的属性。具体代码如下:
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