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GIS的学习（二十七）通过geoserver的georss访问第三方地图

GeoServerGeoRSSGoogle MapsYahoo MapsMicrosoft Virtual Earth 
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       在geoserver中如果想调用第三方地图可以采用georss实现第三方地图的调用。

具体实现参考官方文档如下：

GeoRSS

GeoServer supports GeoRSS as an output format allowing you to serve features as an RSS feed.

Quick Start

If you are using a web browser which can render rss feeds simply visit the url http://localhost:8080/geoserver/wms/reflect?layers=states&format=rss in your browser. This is assuming a local GeoServer instance is running with an out of the box configuration. You should see a result that looks more or less like this:

topp:states rss feed

Ajax Map Mashups

Note

For Ajax map mashups to work, the GeoServer instance must be visible to the Internet (i.e. using the address localhost will not work).

Google Maps

How to create a Google Maps mashup with a GeoRSS overlay produced by GeoServer.

  1. Obtain a Google Maps API Key from Google.

  2. Create an html file called gmaps.html:

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org    R/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
    <title>Google Maps JavaScript API Example<    itle>
    <script src="http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=<INSERT MAPS API KEY HERE>" type="text/javascript"></script>

    <script type="text/javascript">
    //<![CDATA[
        function load() {
            if (GBrowserIsCompatible()) {
                var map = new GMap2(document.getElementById("map"));
                map.addControl(new GLargeMapControl());
                map.setCenter(new GLatLng(40,-98), 4);
                var geoXml = new GGeoXml("<INSERT GEOSERVER URL HERE>/geoserver/wms/reflect?layers=states&format=rss");
                map.addOverlay(geoXml);
            }
        }
    //]]>
    </script>

    </head>
    <body onload="load()" onunload="GUnload()">
        <div id="map" style="width: 800px; height: 600px"></div>
    </body>
</html>

  3. Visit gmaps.html in your web browser.

Note

The version of the google maps api must be 2.x, and not just 2 You must insert your specific maps api key, and geoserver base url

Yahoo Maps

How to create a Yahoo! Maps mashup with a GeoRSS overlay produced by GeoServer.

  1. Obtain a <Yahoo Maps Application ID <http://search.yahooapis.com/webservices/register_application>`_ from Yahoo.

  2. Create an html file called ymaps.html:

    <html>
    <head>
    <title>Yahoo! Maps GeoRSS Overlay Example<    itle>
    <script src="http://api.maps.yahoo.com/ajaxymap?v=3.0&appid=<INSERT APPLICATION ID HERE>" type="text/javascript"></script>
    <script type="text/javascript" language="JavaScript">

        function StartYMap() {
            var map = new YMap(document.getElementById('ymap'));
            map.addPanControl();
            map.addZoomShort();

            function doStart(eventObj) {
                var defaultEventObject = eventObj;
                //eventObj.ThisMap [map object]
                //eventObj.URL [argument]
                //eventObj.Data [processed input]
            }

            function doEnd(eventObj) {
                var defaultEventObject = eventObj;
                //eventObj.ThisMap [map object]
                //eventObj.URL [argument]
                //eventObj.Data [processed input]
                map.smoothMoveByXY(new YCoordPoint(10,50));
            }

            YEvent.Capture(map,EventsList.onStartGeoRSS, function(eventObj) { doStart(eventObj); });
            YEvent.Capture(map,EventsList.onEndGeoRSS, function(eventObj) { doEnd(eventObj); });

            map.addOverlay(new YGeoRSS('http://<INSERT GEOSERVER URL HERE>/geoserver/wms/reflect?layers=states&format=rss'));
        }

    window.onload = StartYMap;
     </script>
      </head>
      <body>
           <div id="ymap" style="width: 800px; height: 600px; left:2px; top:2px"></div>
     </body>
</html>

  3. Visit ymaps.html in your web browser.

Note

The version of the yahoo maps api must be 3.0 You must insert your specific application id, and geoserver base url

Microsoft Virtual Earth

Note

Non Internet Explorer Users*: GeoRSS overlays are only supported in Internet Explorer, versions greater then 5.5.

How to create a Microsoft Virtual Earth mashup with a GeoRSS overlay produced by GeoServer.

Note

To access a GeoRSS feed from Microsoft Virtual Earth the file (ve.html) must be accessed from a Web Server, IE. It will not work if run from local disk.

  1. Create an html file called ve.html. Note: You must insert your specific maps api key, and geoserver base url:

    <html>
  <head>
    <script src="http://dev.virtualearth.net/mapcontrol/v4/mapcontrol.js"></script>
    <script>
     var map;

     function OnPageLoad()
     {
        map = new VEMap('map');
        map.LoadMap();

        var veLayerSpec = new VELayerSpecification();
        veLayerSpec.Type = VELayerType.GeoRSS;
        veLayerSpec.ID = 'Hazards';
    veLayerSpec.LayerSource = 'http://<INSERT GEOSERVER URL HERE>/geoserver/wms/reflect?layers=states&format=rss';
    veLayerSpec.Method = 'get';
    map.AddLayer(veLayerSpec);
    }
   </script>
 </head>
 <body onload="OnPageLoad();">
    <div id="map" style="position:relative;width:800px;height:600px;"></div>
  </body>

</html>

  2. Visit ve.html in your web browser. You should see the following:

 

Virtual Earth

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