OpenLayers调用ArcGIS Server发布的WFS服务
原创: 蔡建良 2013-08-20
一． 开发环境
1) Openlayers2.13+arcgis server9.3
2) WFS地图空间参考EPSG: 4326也可以是EPSG:102113
3) Openlayers底图空间参考EPSG: 900913
二． 发布地图服务
1) 采用ArcMap制作mxd地图文档。
2) 采用ArcCatalog发布地图服务，将wfs打勾。
部分操作截图如下:
3) 测试WFS服务：
http://lx-server/arcgis/services/Yangdi/MapServer/WFSServer?request=GetCapabilities&service=WFS
三． 采用OpenLayers.Layer.Vector调用。该方法为POST方式。
WFS1.1.0支持服务端重投影：
new OpenLayers.Layer.Vector("一类样地",{
strategies: [new OpenLayers.Strategy.BBOX()],
protocol: new OpenLayers.Protocol.WFS({
version: "1.1.0",
srsName: "EPSG:102113",
url: "http://lx-server/arcgis/services/Yangdi/MapServer/WFSServer",
featureNS: "",
featureType: "plotpoint_Liaoning_Intersect",
maxFeatures: "10",
geometryName: "Shape"
}),
projection: new OpenLayers.Projection("EPSG:102113"),
visibility: false
})
WFS1.0.0不支持服务端重投影，这边是客户端重投影：
new OpenLayers.Layer.Vector("一类样地",{
strategies: [new OpenLayers.Strategy.BBOX()],
protocol: new OpenLayers.Protocol.WFS({
version: "1.0.0",
srsName: "EPSG:4326",
url: "http://lx-server/arcgis/services/Yangdi/MapServer/WFSServer",
featureNS: "",
featureType: "plotpoint_Liaoning_Intersect",
maxFeatures: "10",
geometryName: "Shape"
}),
projection: new OpenLayers.Projection("EPSG:4326"),
visibility: false
})
四． 采用OpenLayers.Layer.WFS调用。该方法为GET方式。
注意:使用该方法必须引入deprecated.js 文件。
new OpenLayers.Layer.WFS(
"一类样地",
"http://lx-server/arcgis/services/Yangdi/MapServer/WFSServer?",
{
request: 'GetFeature',
typename: "plotpoint_Liaoning_Intersect",
maxfeatures: 10,
extractAttributes: false,
version: "1.1.0",
srsName: "EPSG:102113"
},
{
projection: new OpenLayers.Projection("EPSG:900913"),
isBaseLayer: false,
extractAttributes: false,
visibility: false
}
)
五. OpenLayers调用WFS服务跨域问题解决
1) 在IIS中部署Openlayers开发的网站。
2) 安装python。并让IIS支持python脚本。部分操作截图:
3) 将openlayes自带的proxy.cgi扩展名改为proxy.py，并做如下修改。
(1) 打开proxy.py文件，将开头第一行内容
#!/usr/bin/env python (这是linux的路径)
改为windows路径：
#!C:/Python25/python.exe –u
(2) 在allowedHosts数组中添加要访问的跨域网址lx-server。
allowedHosts = ['www.openlayers.org', 'openlayers.org',
'labs.metacarta.com', 'world.freemap.in',
'prototype.openmnnd.org', 'geo.openplans.org',
'sigma.openplans.org', 'demo.opengeo.org',
'www.openstreetmap.org', 'sample.azavea.com',
'v2.suite.opengeo.org', 'v-swe.uni-muenster.de:8080',
'vmap0.tiles.osgeo.org', 'www.openrouteservice.org',
'maps.wien.gv.at','lx-server’]
4) 在网页脚本中加入如下代码:
OpenLayers.ProxyHost = "proxy.py?url=";
六．测试
在浏览器上运行网页：http://localhost/ yangdi/index.html
效果如下:
Wfs服务返回数据格式为:
<wfs:FeatureCollection xmlns:anhuiplot="http://jane/arcgis/services/anhuiplot/MapServer/WFSServer" xmlns:gml="http://www.opengis.net/gml" xmlns:wfs="http://www.opengis.net/wfs" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jane/arcgis/services/anhuiplot/MapServer/WFSServer http://localhost/arcgis/services/anhuiplot/MapServer/WFSServer?request=DescribeFeatureType%26version=1.1.0%26typename=anhuiproj http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd">
<gml:boundedBy>...</gml:boundedBy>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
<gml:featureMember>...</gml:featureMember>
</wfs:FeatureCollection>
---其中featureMember-----------------
<gml:featureMember>
<anhuiplot:anhuiproj gml:id="F3__10">
<anhuiplot:OBJECTID>10</anhuiplot:OBJECTID>
<anhuiplot:Shape>
<gml:Point>
<gml:pos>13058352.4935765 3694896.1439479</gml:pos>
</gml:Point>
</anhuiplot:Shape>
<anhuiplot:PLOT_NO>6975</anhuiplot:PLOT_NO>
</anhuiplot:anhuiproj>
</gml:featureMember>
经测试返回10个要素，数据大小为45K。这是由于字段太多造成。可将wfs服务的数据源不需要的字段删除，留下关键字段。最后留下3个字段，返回数据的大小变为4K。
