OpenLayers调用ArcGIS Server发布的WFS服务

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。