OpenLayers調用ArcGIS Server發布的WFS服務
原創: 蔡建良 2013-08-20
一． 開發環境
1) Openlayers2.13+arcgis server9.3
2) WFS地圖空間參考EPSG: 4326也可以是EPSG:102113
3) Openlayers底圖空間參考EPSG: 900913
二． 發布地圖服務
1) 采用ArcMap制作mxd地圖文檔。
2) 采用ArcCatalog發布地圖服務，將wfs打勾。
部分操作截圖如下:
3) 測試WFS服務：
http://lx-server/arcgis/services/Yangdi/MapServer/WFSServer?request=GetCapabilities&service=WFS
三． 采用OpenLayers.Layer.Vector調用。該方法為POST方式。
WFS1.1.0支持服務端重投影：
new OpenLayers.Layer.Vector("一類樣地",{
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不支持服務端重投影，這邊是客戶端重投影：
new OpenLayers.Layer.Vector("一類樣地",{
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調用。該方法為GET方式。
注意:使用該方法必須引入deprecated.js 文件。
new OpenLayers.Layer.WFS(
"一類樣地",
"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調用WFS服務跨域問題解決
1) 在IIS中部署Openlayers開發的網站。
2) 安裝python。並讓IIS支持python腳本。部分操作截圖:
3) 將openlayes自帶的proxy.cgi擴展名改為proxy.py，並做如下修改。
(1) 打開proxy.py文件，將開頭第一行內容
#!/usr/bin/env python (這是linux的路徑)
改為windows路徑：
#!C:/Python25/python.exe –u
(2) 在allowedHosts數組中添加要訪問的跨域網址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) 在網頁腳本中加入如下代碼:
OpenLayers.ProxyHost = "proxy.py?url=";
六．測試
在瀏覽器上運行網頁：http://localhost/ yangdi/index.html
效果如下:
Wfs服務返回數據格式為:
<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>
經測試返回10個要素，數據大小為45K。這是由於字段太多造成。可將wfs服務的數據源不需要的字段刪除，留下關鍵字段。最后留下3個字段，返回數據的大小變為4K。