WFS的呼吁规范

文章版权由小编李晓晖和知乎共有,若转载请于分明处标明出处:http://www.cnblogs.com/naaoveGIS/

1.背景

1.1WMS简介

Web地图服务(WMS)利用具有地理空间地方音讯的数目制作地图。其少校地图定义为地理数据可视的突显。那个正式定义了三个操作:GetCapabitities再次回到服务级元数据,它是对服务新闻内容和须要参数的一种描述;
GetMap重返一个地形图映像,其地理空间参考和尺寸参数是总而言之定义了的;GetFeatureInfo(可选)重回彰显在地形图上的一些特殊要素的信息。

GeoServer官网上对其WMS规范的描述地址为http://docs.geoserver.org/stable/en/user/services/wms/index.html

1.2WFS简介

Web要素服务(WFS)再次回到的是要素级的GML编码,并提供对要素的加码、修改、删除等作业操作,是对Web地图服务的一发长远。OGC
Web要素服务允许客户端从八个Web要素服务中赢得使用地理标志语言(GML)编码的地理空间数据,这些远东定义了两个操作:GetCapabilites重返Web要素服务属性描述文档(用XML描述);DescribeFeatureType再次回到描述可以提供服务的此外因素结构的XML文档;GetFeature为一个取得要素实例的伸手提供服务;Transaction为作业请求提供劳务;LockFeature处理在一个事务时期对一个或三个要素类型实例上锁的伸手。

GeoServer官网上对其WFS规范的叙述地址为http://docs.geoserver.org/stable/en/user/services/wfs/index.html

2.WMS请求规范详解

2.1GetCapabitities(重回服务级元数据)

URL例子:

http://localhost:8680/geoserver/wms?service=wms&version=1.1.1&request=GetCapabilities

参数意义:

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回去结果:

其回到结果为一个描述性XML文档,包蕴了以下四个元素:

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2.2GetMap(获取影象)

URL例子:

http://localhost:8680/geoserver/urbanlayer/wms?LAYERS=urbanlayer%3ADIJI&STYLES=&FORMAT=image%2Fpng&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG%3A3857&BBOX=10008053.503544,5274522.8578226,10039584.01305,5292493.614536&WIDTH=579&HEIGHT=330

参数意义:

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88bifa必发娱乐,此地对回到的格式(format)有如下拔取:

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归来结果:

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瞩目:此呼吁同样援救XML格式请求,如下:

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2.3GetFeatureInfo(重回要素音讯)

URL例子:

http://localhost:8680/geoserver/urbanlayer/wms?REQUEST=GetFeatureInfo&EXCEPTIONS=application%2Fvnd.ogc.se\_xml&BBOX=10008053.503544%2C5274522.857823%2C10039584.01305%2C5292493.614536&SERVICE=WMS&INFO\_FORMAT=text/plain&QUERY\_LAYERS=urbanlayer%3ADIJI&FEATURE\_COUNT=50&Layers=urbanlayer%3ADIJI&WIDTH=579&HEIGHT=330&format=image%2Fpng&styles=&srs=EPSG%3A3857&version=1.1.1&x=315&y=147

参数意义:

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 那里对回到的文本格式(info_format)有如下接纳:

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重回结果(忽略普通话乱码):

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3.WFS请求规范

3.1GetCapabilities(重返服务描述文档)

URL例子:

http://localhost:8680/geoserver/wfs?service=wfs&version=1.1.0&request=GetCapabilities

参数意义:

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归来结果:

回去的结果为描述性XML,包涵以下几个基本点部分:

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3.2DescribeFeatureType(再次回到图层描述新闻)

URL例子:

http://localhost:8680/geoserver/urbanlayer/ows?service=wfs&version=1.0.0&request=DescribeFeatureType&typeName=DIJI

参数意义:

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 再次回到结果:

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3.3GetFeature(获取图层要素)

3.3.1GET查询

那边首先付诸一个例子:

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http://localhost:8080/eGovaGISV14//home/gis/proxy.htm?http://192.168.101.14/geoserver/urbanlayer/wfs?request=GetFeature&version=1.1.0&typename=jianfudanhistory&Filter=%3CFilter%20xmlns:ogc=%22http://www.opengis.net/ogc%22%20xmlns:gml=%22http://www.opengis.net/gml%22%3E%3CIntersects%3E%20%3CPropertyName%3Ethe\_geom%3C/PropertyName%3E%20%3Cgml:Envelope%20srsName=%22EPSG:4326%22%3E%09%20%3Cgml:lowerCorner%3E120.1762573834964%2030.280899047851562%3C/gml:lowerCorner%3E%20%09%20%3Cgml:upperCorner%3E120.18999029365265%2030.294631958007812%3C/gml:upperCorner%3E%20%3C/gml:Envelope%3E%3C/Intersects%3E%3C/Filter%3E&outputformat=json

此恳请常见的参数有:typeNames,featureID,propertyName,Filter, count,
sortBy。其中Filter参数最为重大,主要担负举办抉择过滤。关于Filter的具体描述可参照:http://docs.geoserver.org/stable/en/user/filter/function.html

 重返结果为:

 {“type”:”FeatureCollection”,”features”:[{“type”:”Feature”,”id”:”jianfudan.322″,”geometry”:{“type”:”MultiPolygon”,”coordinates”:[[[[30.276436000822056,120.20021],[30.275750000822033,120.20021],[30.22768400082126,120.22562],[30.245537000821543,120.17343000000001],[30.276436000822056,120.20021]]]]},”geometry_name”:”the_geom”,”properties”:{“limitid”:71,”displayorder”:null,”regionid”:3,”validfromdate”:”2016-05-15Z”,”validtodate”:”2016-06-14Z”,”validflag”:1,”media”:null,”shape_length”:null,”shape_area”:null,”graphicid”:322,”regionname”:”江干区”,”eventtypes”:null,”otherrequest”:null,”limitname”:”上报区域71″}},{“type”:”Feature”,”id”:”jianfudan.318″,”geometry”:{“type”:”MultiPolygon”,”coordinates”:[[[[30.26407600082185,120.19668600000001],[30.26407600082185,120.196434],[30.262875000821833,120.20785],[30.24708200082157,120.203896],[30.255150000821704,120.187164],[30.26407600082185,120.19668600000001]]]]},”geometry_name”:”the_geom”,”properties”:{“limitid”:72,”displayorder”:null,”regionid”:3,”validfromdate”:”2016-05-04Z”,”validtodate”:”2016-06-03Z”,”validflag”:1,”media”:”http://172.18.6.197:8081/MediaRoot/null/20160505/72/84989ee1-9bab-4640-8f24-4a7381f1c4e8/机票预订.png","shape\_length":null,"shape\_area":null,"graphicid":318,"regionname":"江干区","eventtypes":"乱搭乱建,暴露垃圾,积存垃圾渣土,路面不洁,河道不洁(含沟渠、湖面)","otherrequest":"测试","limitname":"上报区域72"}}\],"crs":{"type":"EPSG","properties":{"code":"4490"}}}

3.3.1.1点查询Filter

<Filter xmlns:ogc=”http://www.opengis.net/ogc
xmlns:gml=”http://www.opengis.net/gml"&gt;

<Intersects>

<PropertyName>the_geom</PropertyName>

<gml:Envelope srsName=”EPSG:4326″>     

<gml:lowerCorner>120.15336460382575
30.2743621901609</gml:lowerCorner>

<gml:upperCorner>120.167097513982
30.28809510031715</gml:upperCorner>

</gml:Envelope>

</Intersects>

</Filter>

3.3.1.2自定义多边形查询Filter

<Filter xmlns:ogc=”http://www.opengis.net/ogc” xmlns:gml=”http://www.opengis.net/gml"&gt;

<Intersects> 

<PropertyName>the_geom</PropertyName>

<gml:MultiPolygon srsName=”EPSG:4326″> 

<gml:polygonMember> 

<gml:Polygon> 

<gml:outerBoundaryIs> 

<gml:LinearRing>

<gml:coordinates xmlns:gml=”http://www.opengis.net/gml” decimal=”.” cs=”,” ts=””>

120.15677,30.2557 120.15677,30.26351 120.16833,30.26351 120.16833,30.2557 120.15677,30.2557

</gml:coordinates>  

</gml:LinearRing>  

</gml:outerBoundaryIs>  

</gml:Polygon>  

</gml:polygonMember>  

</gml:MultiPolygon>

</Intersects>

</Filter>

 

3.3.2Post查询

因为GET请求的数据量大小在4kb以内,所以Post为更常用的主意。以下为一个切实的例证:

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中间直接发送的为一个XML文件,其Filter中可以填充的内容和GET中的Filter一样。

具体内容如下:

<?xml version=’1.0′ encoding=’GBK’?><wfs:GetFeature
service=’WFS’ version=’1.0.0′ outputFormat=’JSON’

xmlns:wfs=’http://www.opengis.net/wfs

xmlns:ogc=’http://www.opengis.net/ogc

xmlns:gml=’http://www.opengis.net/gml
xmlns:xsi=’http://www.w3.org/2001/XMLSchema-instance
xsi:schemaLocation=’http://www.opengis.net/wfs
http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd‘>

<wfs:Query typeName=’cell’>

<wfs:PropertyName>the_geom</wfs:PropertyName>

<wfs:PropertyName>test1</wfs:PropertyName>

<ogc:Filter>

<Or>

<PropertyIsEqualTo><PropertyName>test1</PropertyName><Literal>valuetest1</Literal></PropertyIsEqualTo>

<PropertyIsEqualTo><PropertyName>test2</PropertyName><Literal>valuetest2</Literal></PropertyIsEqualTo>

</Or>

</ogc:Filter>

</wfs:Query>

</wfs:GetFeature>

3.4 Transaction(编辑要素)

该方法接济对要素的增删改。那里一向付出Post请求中发送的XML协会格式:

3.4.1添加要素

<wfs:Transaction service=”WFS” version=”1.0.0″  
       outputFormat=”GML2″  
      
xmlns:opengis=”http://www.cetusOpengis.com”  
       xmlns:wfs=”http://www.opengis.net/wfs”  
       xmlns:ogc=”http://www.opengis.net/ogc”  
       xmlns:gml=”http://www.opengis.net/gml”  
       xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”  
       xsi:schemaLocation=”http://www.opengis.net/wfs  
http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd“>   
       <wfs:Insert handle=”someprj1″>
          <opengis:someprj>
             <opengis:the_geom>
                <gml:Point
srsName=”http://www.opengis.net/gml/srs/epsg.xml#3395” >
                             <gml:coordinates decimal=”.” cs=”,”
ts=””>13404701.212,3850391.781</gml:coordinates>
                </gml:Point>
             </opengis:the_geom>
             <opengis:ssds>13</opengis:ssds>
             <opengis:qqybh>12</opengis:qqybh>
             <opengis:status>0</opengis:status>
          </opengis:someprj>
       </wfs:Insert>  
    </wfs:Transaction>

3.4.2改动要素

<wfs:Transaction service=”WFS” version=”1.0.0″  
       outputFormat=”GML2″  
      
xmlns:opengis=”http://www.cetusOpengis.com”  
       xmlns:wfs=”http://www.opengis.net/wfs”  
       xmlns:ogc=”http://www.opengis.net/ogc”  
       xmlns:gml=”http://www.opengis.net/gml”  
       xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”  
       xsi:schemaLocation=”http://www.opengis.net/wfs  
http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd“>   
       <wfs:Update typeName=”opengis:qqyproject”>
     <wfs:Property>  
       <wfs:Name>qqybh</wfs:Name>
       <wfs:Value>12</wfs:Value>
     </wfs:Property>
      <ogc:Filter>   
      <ogc:PropertyIsEqualTo>
      <ogc:PropertyName>qqybh</ogc:PropertyName>
      <ogc:Literal>0</ogc:Literal>
      </ogc:PropertyIsEqualTo>
     </ogc:Filter>   
       </wfs:Update>   
    </wfs:Transaction>

3.4.3刨除要素

<wfs:Transaction service=”WFS” version=”1.0.0″  
       outputFormat=”GML2″  
      
xmlns:opengis=”http://www.cetusOpengis.com”  
       xmlns:wfs=”http://www.opengis.net/wfs”  
       xmlns:ogc=”http://www.opengis.net/ogc”  
       xmlns:gml=”http://www.opengis.net/gml”  
       xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance”  
       xsi:schemaLocation=”http://www.opengis.net/wfs  
http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd“>   
       <wfs:Delete typeName=”opengis:qqyproject”>
      <ogc:Filter>   
      <ogc:PropertyIsLessThan>
      <ogc:PropertyName>qqybh</ogc:PropertyName>
      <ogc:Literal>12</ogc:Literal>
      </ogc:PropertyIsLessThan>
      <ogc:PropertyIsGreaterThan>
      <ogc:PropertyName>qqybh</ogc:PropertyName>
      <ogc:Literal>0</ogc:Literal>
      </ogc:PropertyIsGreaterThan>
     </ogc:Filter>   
       </wfs:Delete>   
    </wfs:Transaction>

4.总结

a.动态出图能够使用WMS中的GetMap请求。

b.矢量查询可以利用WFS中的GetFeature请求。

c.要素编辑可以运用WFS中的Transaction请求。

                                                                   
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