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Understanding GeoRSS in Webmaps: A Simple Guide to Implementation and Usage

Discover the essentials of GeoRSS and its integration into web mapping applications. This guide covers the basics of the GeoRSS specification, including how to create and validate your GeoRSS feeds. We explore the use of OpenLayers for rendering maps with GeoRSS data, as well as tips for ensuring your feeds are XML-compliant. Learn about the benefits of using GeoRSS, such as easy automation and aggregation, while also considering potential challenges like feed quantity limits. Perfect for developers looking to enhance their webmap capabilities.

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Understanding GeoRSS in Webmaps: A Simple Guide to Implementation and Usage

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  1. GeoRSS and Webmaps

  2. Really Simple Syndication

  3. Specification <?xml version="1.0" encoding="UTF-8"?> <rss version="2.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:dc="http://purl.org/dc/elements/1.1/"> <channel> <title>name of the FEED</title> <description></description> <link>http://www.your.com/FEED</link> <dc:publisher>creator's name</dc:publisher> <pubDate>2011</pubDate> <item> <title>unique item</title> <pubDate>2008-02-01</pubDate> <description><![CDATA[some formatting<br> can be done<br> in the popup]]></description> <link>http://URI.to.your.com/ITEM_HANDLE</link> <geo:lat>36.75</geo:lat> <geo:long>127.75</geo:long> </item> </channel> </rss>

  4. Reading GeoRSS in Webmaps <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>GeoRSS Example</title> <link rel="stylesheet" type="text/css" href="openlayers_style.css"> <link rel="stylesheet" type="text/css" href="style.css"> <style type="text/css"> #map {width: 512px; height: 512px; border: 1px solid black;} </style> <script src="OpenLayers.js"></script> <script type="text/javascript"> var map, markers, layer; function init(){ map = new OpenLayers.Map('map', {controls: [new OpenLayers.Control.PanZoomBar()]}); var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} ); var newl = new OpenLayers.Layer.GeoRSS( 'local GeoRSS', 'news.xml'); map.addLayer(newl); } </script> </head> <body onload="init()"> <h2>sample</h2> <div id="tags"></div> <div id="map"></div> <div id="docs"></div> </body> </html>>

  5. OpenLayers Map Interface

  6. Google Map Interface http://code.google.com/apis/maps/documentation/javascript/overlays.html#KMLLayers

  7. Generating GeoRSS Feeds 1) query database and serialize results to GeoRSS 2) parse or transform existing metadata repository to generate GeoRSS

  8. Validating GeoRSS Feeds 1) be careful to escape (or delete from feed) special characters! some diacritic marks & reserved characters will throw errors 2) validate your content as clean XML first (http://validator.w3.org/) 3) check your feed in various browsers 4) validate the GeoRSS in OpenLayers (http://openlayers.org/dev/examples/georss.html)

  9. Pros and Cons Lightweight Easy to Automate Easy to Aggregate W3C Standard Webmap Providers Adopt OGC & Standards Adopt Web 2.0 Generic API for users Feeds abbreviated Webmaps choke on qty Feeds Load in Client OpenLayers -> Vector

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