World Eathquake Map (MIT Exhibit)

Description: 
This demo shows a map of the world depicting the locations of all earthquakes of mignitude greater than 3.0, dph of less than 50 miles, over the previous seven days. Clicking on a location shows additional details. Click on a property facet to filter relevant earthquakes.
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Interesting Observations

A user may use a map to view recent earthquakes, and SPARQL querying can be used filter what will be displayed on the Map (e.g. only show earthquakes whose magnitude is no less than 2.0).

Technology Highlights

Simile Exhibit offers a convenient interface that accepts JSON data sources. However, Exhibit and the Google Visualization API accept different types of JSON formats. Therefore, we used the SparqlProxy to bridge this gap. Below is the tricky point
  
 <link rel="exhibit/data"
       href="http://data-gov.tw.rpi.edu/ws/sparqlproxy.php?query-uri=http%3A%2F%2Fdata-gov.tw.rpi.edu%2Fsparql%2Fdemo-34-exhibit.sparql&output=exhibit" 
       type="application/json"
       charset="utf-8"/>
http://data-gov.tw.rpi.edu/sparql/demo-34-exhibit.sparql the complete source code is at http://code.google.com/p/data-gov-wiki/source/browse/trunk/www/demo/exhibit/demo-34-exhibit-sparql.html Below are some documentations for using Exhibit, which is spread around the web, and some useful tips:

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Currently, the depth property in the RDF data is an untyped literal. This should be converted to the float datatype so that SPARQL can use filtering. There is yet another way to directly show the entire RDF/XML data on MIT Exhibit. This is accomplished by replacing the data with the following line (see this link)
 <link rel="exhibit/data"
       href="http://data-gov.tw.rpi.edu/raw/34/data-34.rdf" 
       type="application/rdf+xml"
       charset="utf-8"/>
The complete source code is at http://code.google.com/p/data-gov-wiki/source/browse/trunk/www/demo/exhibit/demo-34-exhibit-rdf.html. See http://simile.mit.edu/wiki/Exhibit/How_to_import_RDF_on_the_fly for more information.
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