Data Gov Demo

Demo: Castnet Ozone Map

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  • description: A Map (with faceted browsing enabled by Exhibit) of CASTNET stations and their average Ozone level. When click a circle (denoting a station), more details about the station will show up in a balloon. There is a link that lead to a pop-up window of timeline (based on Google Visualization) showing the Castnet Ozone level values at the station. A video demo is at http://www.youtube.com/watch?v=l1W_hq0tcVE.
  • creator(s): Dominic DiFranzo,Li Ding
  • created: August 17,2009
  • modified: 2010-4-1
live demo here

Contents

Facts about this Demonstration

Live Demo(s)
Video Demo(s)
Data.gov Data source(s)
Other Data source(s)
Technology Used
Related SPARQL

video demo

About

For this demo, we used RDF data derived from on ozone and visibility readings provided by the EPA's Castnet project. This RDF combines raw data on Castnet readings (ozone and visibility) with corresponding geographic information on the sites of readings, which the raw Castnet data lacks. On the provided map of the US, every yellow dot represents a single Casetnet site and dot size corresponds to an average Ozone reading for that site, where larger dots represent larger averages. When a Castnet site is clicked, a small pop-up opens, displaying more information on that site, along with a link. This link takes the user to another page that displays in a timeline all the Ozone and Visibility data available for that site. This timeline uses the Google Visualization API giving users added functionality in how they view the data in the timeline. To allow users to filter through Castnet readings, a faceted browsing interface (from the MIT Simile Exhibit API) is provided.

interesting observations

This demo uses SPARQL to combine raw data on the Castnet Project (dataset 8) from Data.gov and geographic information on Castnet Stations (Dataset 10001) from the EPA website. This enables the demo to plot Castnet readings on a US map, allowing users to look for geographic relationships within the Castnet data. When a user clicks on a Castnet station, historical ozone values for that station can then be viewed through a timeline. Finally, the use of faceted browsing aids users in interacting with presented data, allowing for filtering based on different criteria.

Technology Highlights

  • This uses the RDF to Google visualization conversion process of using a SPARQL service and XSLT to put the data in JSON format.
    • SPARQL is used to grab data from two datasets.
  • This also uses MIT Simile Labs Exhibit to make the faceted browsing map.
    • A Web service is used to convert JSON from SPARQL into JSON that Exhibit can use.
  • The visualization used is the annotated timeline.
Facts about Demo: Castnet Ozone MapRDF feed
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Dcterms:created17 August 2009  +
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Dcterms:descriptionA Map (with faceted browsing enabled by Ex A Map (with faceted browsing enabled by Exhibit) of CASTNET stations and their average Ozone level. When click a circle (denoting a station), more details about the station will show up in a balloon. There is a link that lead to a pop-up window of timeline (based on Google Visualization) showing the Castnet Ozone level values at the station. A video demo is at http://www.youtube.com/watch?v=l1W_hq0tcVE. ttp://www.youtube.com/watch?v=l1W_hq0tcVE.
Dcterms:modified1 April 2010  +
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