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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>SOS Client Example</title>
<link rel="stylesheet" href="openlayers/theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
.sosmap {
width: 768px;
height: 512px;
}
</style>
<script src="openlayers/OpenLayers.js"></script>
<script type="text/javascript">
var map;
OpenLayers.ProxyHost = "proxy.cgi?url=";
OpenLayers.Util.extend(OpenLayers.Lang.en,
{
'SOSClientType': "Type",
'SOSClientTime': "Date/time",
'SOSClientLastvalue': "Last value"
}
);
// Example class on how to put all the OpenLayers SOS pieces together
OpenLayers.SOSClient = OpenLayers.Class({
url: null,
map: null,
capsformat: new OpenLayers.Format.SOSCapabilities(),
obsformat: new OpenLayers.Format.SOSGetObservation(),
initialize: function (options) {
OpenLayers.Util.extend(this, options);
var params = {'service': 'SOS', 'request': 'GetCapabilities'};
var paramString = OpenLayers.Util.getParameterString(params);
url = OpenLayers.Util.urlAppend(this.url, paramString);
OpenLayers.Request.GET({url: url,
success: this.parseSOSCaps, scope: this});
},
getFois: function() {
var result = [];
this.offeringCount = 0;
for (var name in this.SOSCapabilities.contents.offeringList) {
var offering = this.SOSCapabilities.contents.offeringList[name];
this.offeringCount++;
for (var i=0, len=offering.featureOfInterestIds.length; i<len; i++) {
var foi = offering.featureOfInterestIds[i];
if (OpenLayers.Util.indexOf(result, foi) === -1) {
result.push(foi);
}
}
}
return result;
},
parseSOSCaps: function(response) {
// cache capabilities for future use
this.SOSCapabilities = this.capsformat.read(response.responseXML || response.responseText);
this.layer = new OpenLayers.Layer.Vector("Stations", {
strategies: [new OpenLayers.Strategy.Fixed()],
protocol: new OpenLayers.Protocol.SOS({
formatOptions: {internalProjection: map.getProjectionObject()},
url: this.url,
fois: this.getFois()
})
});
this.map.addLayer(this.layer);
this.ctrl = new OpenLayers.Control.SelectFeature(this.layer,
{scope: this, onSelect: this.onFeatureSelect});
this.map.addControl(this.ctrl);
this.ctrl.activate();
},
getTitleForObservedProperty: function(property) {
for (var name in this.SOSCapabilities.contents.offeringList) {
var offering = this.SOSCapabilities.contents.offeringList[name];
if (offering.observedProperties[0] === property) {
return offering.name;
}
}
},
showPopup: function(response) {
this.count++;
var output = this.obsformat.read(response.responseXML || response.responseText);
if (output.measurements.length > 0) {
this.html += '<tr>';
this.html += '<td width="100">'+this.getTitleForObservedProperty(output.measurements[0].observedProperty)+'</td>';
this.html += '<td>'+output.measurements[0].samplingTime.timeInstant.timePosition+'</td>';
this.html += '<td>'+output.measurements[0].result.value + ' ' + output.measurements[0].result.uom + '</td>';
this.html += '</tr>';
}
// check if we are done
if (this.count === this.numRequests) {
var html = '<table cellspacing="10"><tbody>';
html += '<tr>';
html += '<th><b>'+OpenLayers.i18n('SOSClientType')+'</b></th>';
html += '<th><b>'+OpenLayers.i18n('SOSClientTime')+'</b></th>';
html += '<th><b>'+OpenLayers.i18n('SOSClientLastvalue')+'</b></th>';
html += '</tr>';
html += this.html;
html += '</tbody></table>';
var popup = new OpenLayers.Popup.FramedCloud("sensor",
this.feature.geometry.getBounds().getCenterLonLat(),
null,
html,
null,
true,
function(e) {
this.hide();
OpenLayers.Event.stop(e);
// unselect so popup can be shown again
this.map.getControlsByClass('OpenLayers.Control.SelectFeature')[0].unselectAll();
}
);
this.feature.popup = popup;
this.map.addPopup(popup);
}
},
onFeatureSelect: function(feature) {
this.feature = feature;
this.count = 0;
this.html = '';
this.numRequests = this.offeringCount;
if (!this.responseFormat) {
for (format in this.SOSCapabilities.operationsMetadata.GetObservation.parameters.responseFormat.allowedValues) {
// look for a text/xml type of format
if (format.indexOf('text/xml') >= 0) {
this.responseFormat = format;
}
}
}
// do a GetObservation request to get the latest values
for (var name in this.SOSCapabilities.contents.offeringList) {
var offering = this.SOSCapabilities.contents.offeringList[name];
var xml = this.obsformat.write({
eventTime: 'latest',
resultModel: 'om:Measurement',
responseMode: 'inline',
procedure: feature.attributes.id,
offering: name,
observedProperties: offering.observedProperties,
responseFormat: this.responseFormat
});
OpenLayers.Request.POST({
url: this.url,
scope: this,
failure: this.showPopup,
success: this.showPopup,
data: xml
});
}
},
destroy: function () {
},
CLASS_NAME: "OpenLayers.SOSClient"
});
function init(){
map = new OpenLayers.Map( 'map' );
var baseLayer = new OpenLayers.Layer.WMS("Test Layer", "http://vmap0.tiles.osgeo.org/wms/vmap0?", {
layers: "basic"}, {singleTile: true});
var sos = new OpenLayers.SOSClient({map: map, url: 'http://v-swe.uni-muenster.de:8080/WeatherSOS/sos?'});
map.addLayers([baseLayer]);
map.setCenter(new OpenLayers.LonLat(5, 45), 4);
map.addControl( new OpenLayers.Control.LayerSwitcher() );
map.addControl( new OpenLayers.Control.MousePosition() );
}
</script>
</head>
<body onload="init()">
<h1 id="title">SOS client example</h1>
<div id="tags">
sos, sensor, observation, popup, advanced
</div>
<p id="shortdesc">
Shows how to connect OpenLayers to a Sensor Observation Service (SOS)
</p>
<div id="map" class="sosmap"></div>
<div id="docs">
<p>This example uses a vector layer with a Protocol.SOS and a fixed Strategy.
</p><p>When clicking on a point feature (the weather stations offered by the SOS), the
latest values for all offerings are displayed in a popup.</p>
</div>
</body>
</html>
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