Paikkatietotyöpaja2011 kovanen
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Transcript of Paikkatietotyöpaja2011 kovanen
Finnish Geodetic Institute Department of Geoinformatics and Cartography
Presenting trains in real-time in OpenLayers via GeoRSS
Janne Kovanen
GI Norden June 8–9, 2011, Turku, Finland
2 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
GeoRSS
An geographical syntax in RSS feeds (XML) The coordinate reference system is WGS84 A coordinate conversion to a plane coordinate
reference system is mostly required
Notice! In web browsers you typically see the interpretation of a RSS feed reader view-source:http://188.117.35.14/TrainRSS/
TrainService.svc/trainInfo?train=P704
Updating from an app requires a proxy Several exists (web )
3 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
GeoRSS and GeoRSS-Simple
For Atom 1.0, RSS 2.0 and RSS 1.0 GML content <georss:where>
<gml:Point> <gml:pos>45.256 -71.92</gml:pos> </gml:Point> </georss:where>
Too complex? Simpler alternative: <georss:point>60.1 54.2</georss:point> <georss:line>45.256 -110.45 46.46 -109.48 43.84 -109.86</
georss:line> <georss:polygon>45.256 -110.45 46.46 -109.48 43.84 -109.86
45.256 -110.45</georss:polygon>
4 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
OpenLayers and GeoRSS
OpenLayers.Layer.GeoRSS Extends a layer for markers As such OL downloads the feed only ones Features are stored as OpenLayers.Feature Does not contains methods for handling features!
OpenLayers.Format.GeoRSS Format for reading GeoRSS Only reads such as a title, description and geometry Features are handled as OpenLayers.Feature.Vector
OpenLayers.LonLat vs. OpenLayers.Geometry
5 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
“Trains on a map” interface All trains <rss version="2.0"> <channel xmlns:georss="http://www.georss.org/georss"> <title>Train Feed</title> <description>All trains feed</description> <lastBuildDate>Tue, 20 Sep 2011 15:00:35 +0300</lastBuildDate> <category>Train System</category> <item> <guid isPermaLink="false">H355</guid> <category>1</category><title>H 355</title> <description>Summary</description> <pubDate>Tue, 20 Sep 2011 15:00:35 +0300</pubDate> <georss:point>60.6302800000001 26.8929000000001</georss:point> <from>KTS</from><to>KV</to> <status>1</status><dir>345</dir> </item> ... </channel> </rss>
http://www.apps4finland.fi/fi/data/junat-kartalla-palvelun-rajapinta/
6 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
Demo 1: Static one time feed
// Use some proxy. Add the IP address to the proxy file before this OpenLayers.ProxyHost = “/cgi-bin/proxy.cgi?url=”; // Initialize OpenLayers function init() {
var map = new OpenLayers.Map('map'); // Create the background map layers etc (the other demo) // Create the train layer var newTrainLayer = new OpenLayers.Layer.GeoRSS( “Train Feed”, “http://188.117.35.14/TrainRSS/TrainService.svc/AllTrains”, {projection: new OpenLayers.Projection(“EPSG:4326”)});
map.addLayer(newTrainLayer); // Add controls etc. }
7 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
“Trains on a map” interface Detailed information on trains <rss version="2.0”> <channel xmlns:georss="http://www.georss.org/georss"> <title>P 704</title> <description>Train information feed for train P 704</description> <lastBuildDate>Fri, 16 Sep 2011 13:57:05 +0300</lastBuildDate> <category>1</category> <georss:point>62.2989900000001 27.1673200000001</georss:point> <speed>33</speed> <heading>355</heading> <startStation>OL</startStation> <endStation>KUO</endStation> <status>1</status> <reasonCode/> <lateness>0</lateness> … </channel> </rss>
8 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
“Trains on a map” interface Detailed information on trains <rss version="2.0”> <channel xmlns:georss="http://www.georss.org/georss"> <title>P 704</title> <description>Train information feed for train P 704</description> <lastBuildDate>Fri, 16 Sep 2011 13:57:05 +0300</lastBuildDate> <category>1</category> <georss:point>62.2989900000001 27.1673200000001</georss:point> <speed>33</speed> <heading>355</heading> <startStation>OL</startStation> <endStation>KUO</endStation> <status>1</status> <reasonCode/> <lateness>0</lateness> … </channel> </rss>
9 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
“Trains on a map” interface Detailed information on trains <rss version="2.0"><channel xmlns:georss="http://www.georss.org/georss"><title>IC 71</title><description>Train information feed for train IC 71</description><lastBuildDate>Mon, 19 Sep 2011 11:41:47 +0300</lastBuildDate><category>1</category><georss:point>62.2989900000001 27.1673200000001</georss:point><speed>33</speed><heading>355</heading><startStation>HKI</startStation><endStation>KAJ</endStation><status>1</status><reasonCode> </reasonCode><lateness>0</lateness><item><guid isPermaLink="false">HKI</guid><title>HKI</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime/><scheduledDepartTime>08:12</scheduledDepartTime><eta/><etd>08:12</etd><stationCode>HKI</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">PSL</guid><title>PSL</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>08:17</scheduledTime><scheduledDepartTime>08:18</scheduledDepartTime><eta>08:17</eta><etd>08:18</etd><stationCode>PSL</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">TKL</guid><title>TKL</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>08:27</scheduledTime><scheduledDepartTime>08:28</scheduledDepartTime><eta>08:27</eta><etd>08:28</etd><stationCode>TKL</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">LH</guid><title>LH</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>09:06</scheduledTime><scheduledDepartTime>09:08</scheduledDepartTime><eta>09:06</eta><etd>09:08</etd><stationCode>LH</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">KV</guid><title>KV</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>09:38</scheduledTime><scheduledDepartTime>09:52</scheduledDepartTime><eta>09:38</eta><etd>09:52</etd><stationCode>KV</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">MR</guid><title>MR</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>10:30</scheduledTime><scheduledDepartTime>10:31</scheduledDepartTime><eta>10:30</eta><etd>10:31</etd><stationCode>MR</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">MI</guid><title>MI</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>10:55</scheduledTime><scheduledDepartTime>10:58</scheduledDepartTime><eta>10:55</eta><etd>10:58</etd><stationCode>MI</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">HAU</guid><title>HAU</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>11:21</scheduledTime><scheduledDepartTime>11:22</scheduledDepartTime><eta>11:21</eta><etd>11:22</etd><stationCode>HAU</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">PM</guid><title>PM</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>11:41</scheduledTime><scheduledDepartTime>11:46</scheduledDepartTime><eta>11:41</eta><etd>11:46</etd><stationCode>PM</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">SNJ</guid><title>SNJ</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>12:14</scheduledTime><scheduledDepartTime>12:15</scheduledDepartTime><eta>12:14</eta><etd>12:15</etd><stationCode>SNJ</stationCode><completed>0</completed><status>5</
…
>09:06</scheduledTime><scheduledDepartTime>09:08</scheduledDepartTime><eta>09:06</eta><etd>09:08</etd><stationCode>LH</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">KV</guid><title>KV</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>09:38</scheduledTime><scheduledDepartTime>09:52</scheduledDepartTime><eta>09:38</eta><etd>09:52</etd><stationCode>KV</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">MR</guid><title>MR</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>10:30</scheduledTime><scheduledDepartTime>10:31</scheduledDepartTime><eta>10:30</eta><etd>10:31</etd><stationCode>MR</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">MI</guid><title>MI</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>10:55</scheduledTime><scheduledDepartTime>10:58</scheduledDepartTime><eta>10:55</eta><etd>10:58</etd><stationCode>MI</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">HAU</guid><title>HAU</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>11:21</scheduledTime><scheduledDepartTime>11:22</scheduledDepartTime><eta>11:21</eta><etd>11:22</etd><stationCode>HAU</stationCode><completed>1</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">PM</guid><title>PM</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>11:41</scheduledTime><scheduledDepartTime>11:46</scheduledDepartTime><eta>11:41</eta><etd>11:46</etd><stationCode>PM</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">SNJ</guid><title>SNJ</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>12:14</scheduledTime><scheduledDepartTime>12:15</scheduledDepartTime><eta>12:14</eta><etd>12:15</etd><stationCode>SNJ</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">KUO</guid><title>KUO</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>12:43</scheduledTime><scheduledDepartTime>12:47</scheduledDepartTime><eta>12:43</eta><etd>12:47</etd><stationCode>KUO</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">SIJ</guid><title>SIJ</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>13:05</scheduledTime><scheduledDepartTime>13:06</scheduledDepartTime><eta>13:05</eta><etd>13:06</etd><stationCode>SIJ</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">LNA</guid><title>LNA</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>13:32</scheduledTime><scheduledDepartTime>13:33</scheduledDepartTime><eta>13:32</eta><etd>13:33</etd><stationCode>LNA</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">ILM</guid><title>ILM</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>13:48</scheduledTime><scheduledDepartTime>13:50</scheduledDepartTime><eta>13:48</eta><etd>13:50</etd><stationCode>ILM</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">SKV</guid><title>SKV</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>14:13</scheduledTime><scheduledDepartTime>14:14</scheduledDepartTime><eta>14:13</eta><etd>14:14</etd><stationCode>SKV</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item><item><guid isPermaLink="false">KAJ</guid><title>KAJ</title><description>Summary</description><pubDate>Mon, 19 Sep 2011 11:41:47 +0300</pubDate><scheduledTime>14:40</scheduledTime><scheduledDepartTime/><eta>14:40</eta><etd/><stationCode>KAJ</stationCode><completed>0</completed><status>5</status><georss:point>0 0</georss:point></item></channel></rss>
10 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
Demo 2: Make the trains move // Add the trains layer in the init() through a function call function init() { // …
updateTrains(); }
function updateTrains() { // Do not yet show the trains layer in the layer switcher var newTrainLayer = new OpenLayers.Layer.GeoRSS( “Train Feed”, “http://188.117.35.14/TrainRSS/TrainService.svc/AllTrains”, {projection: new OpenLayers.Projection(“EPSG:4326”),
displayInLayerSwitcher: false}); map.addLayer(newTrainLayer);
// Add a listener for loading newTrainLayer.events.register("loadend", self, function(e) {trainsLoaded(e)});
}
11 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
… Demo 2: Make the trains move // The update interval in milliseconds var trainSetUpdateTimeout = 2000;
function trainsLoaded(event) { if(event.object == null) return; if(trainsLayer != null && trainsLayer != event.object) { map.removeLayer(trainsLayer, false); } trainsLayer = event.object;
// Now show the trains layer on the map and in the layer switcher trainsLayer.setVisibility(true); trainsLayer.displayInLayerSwitcher = true; // Timed update self.setTimeout('updateTrains()', trainSetUpdateTimeout); }
Example 2
12 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
Demo 3: Extending OpenLayers
var TrainRSS = OpenLayers.Class(OpenLayers.Format.XML, { initialize: function(options) { OpenLayers.Format.XML.prototype.initialize.apply(this, [options]); }, …
}
var TrainFeature = OpenLayers.Class(OpenLayers.Feature, { guid: "”, type: 0, speed: 0, heading: 0, status: 0, initialize: function(layer, lonlat, data) { OpenLayers.Feature.prototype.initialize.apply(this, [layer, lonlat, data]);
}, …
}
13 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
… Demo 3: Extending OpenLayers var TrainsRSS = OpenLayers.Class(OpenLayers.Format.GeoRSS, {
layer: null, initialize: function(layer, options) { OpenLayers.Format.GeoRSS.prototype.initialize.apply(this, [options]); this.layer = layer; }, …
},
var TrainsLayer = OpenLayers.Class(OpenLayers.Layer.GeoRSS, { initialize: function(name, location, options) { OpenLayers.Layer.GeoRSS.prototype.initialize.apply(this, [name, location, options]); }, …
},
14 Finnish Geodetic Institute [email protected]
Workshop on Open Location Data 2011
“Trains on a map” interface Train station information <rss version="2.0"> <channel xmlns:georss="http://www.georss.org/georss"> <title /> <description>Station information feed for station KML</description> <lastBuildDate>Thu, 03 Feb 2011 17:18:42 +0200</lastBuildDate> <category>Train System</category> <item> <guid isPermaLink="false">P274</guid> <category>1</category> <title>P 274</title> <description>Summary</description> <pubDate>Thu, 03 Feb 2011 17:18:42 +0200</pubDate> <georss:point>0 0</georss:point> … </item> … </channel> </rss>
http://www.apps4finland.fi/fi/data/junat-kartalla-palvelun-rajapinta/