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Discussion slides for WhereCampDC Session on Linked GeoData, June 10, 2011

Discussion slides for WhereCampDC Session on Linked GeoData, June 10, 2011

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  • 1. 6/10/2011
    U.S. Environmental Protection Agency
    1
    Linked GeoData
    #WhereCampDC 2011
    David G. Smith PE PLS
    USEPA Office of Environmental Information
    202-566-0797
    SmithG.David@epa.gov
    Twitter:@DruidSmith
  • 2. Linked DataWhat’s It All About?
    Speak the Language of the Web
    Just as you surf web pages, linked data lets you surf data.
    SOAP was about making the web try to work like applications; REST was about making applications work like the web.
    Linked Data is about making your DATA work like the web.
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    U.S. Environmental Protection Agency
    2
  • 3. Linked DataWhat’s The Big Fuss?
    Business Case Galore
    Address the non-hierarchical nature of organizations
    Combine information sources on the fly
    W3C standards for interoperability to freely move data
    US Data Warehouse market in 2010 was $10B
    http://www.slideshare.net/bhylandwood/bernadette-hyland-semtech-2011-west-linked-data-cookbook
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    U.S. Environmental Protection Agency
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  • 4. Linked Data Cloud
    http://richard.cyganiak.de/2007/10/lod/
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    U.S. Environmental Protection Agency
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  • 5. Linked Data Basics
    Speak the Language of the Web
    Use URIs as names for things
    Use HTTP URIs so that people can look up those names.
    When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
    Include links to other URIs, so that they can discover more things.
    http://www.w3.org/DesignIssues/LinkedData.html
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    U.S. Environmental Protection Agency
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  • 6. Linked Data Basics
    Tim Berners-Lee: 5-Star model for publishing data
    http://www.w3.org/DesignIssues/LinkedData.html
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    U.S. Environmental Protection Agency
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  • 7. Linked Data Basics
    RDF Structure:
    Triples, much as one might deal with in graphs and other structures, with arcs and nodes – similar to ERDs and Class Diagrams
    Special sauce: These elements can be identified with URIs – not only makes them unique, it is self-describing and dereferenceable for more information!
    http://www.w3.org/TR/rdf-concepts/
    http://www.w3.org/DesignIssues/LinkedData.html
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    U.S. Environmental Protection Agency
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  • 8. Linked Data Basics
    RDF Structure:
    http://en.wikipedia.org/wiki/Resource_Description_Framework
    http://www.w3.org/DesignIssues/LinkedData.html
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    U.S. Environmental Protection Agency
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  • 9. Linked Data Basics
    RDF Structure:
    Represent the data in a common format, e.g.
    RDF/XML,
    Notation-3 (N3),
    Turtle (.ttl),
    N-Triples,
    RDFa, and
    RDF/JSON
    http://en.wikipedia.org/wiki/Resource_Description_Framework
    http://www.w3.org/DesignIssues/LinkedData.html
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    U.S. Environmental Protection Agency
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  • 10. Linked Data Best Practices
    Machine readable format
    HUMAN readable descriptions
    Visibility for search engines
    RDFa and microformats
    voID descriptions - http://vocab.deri.ie/void
    http://www.slideshare.net/bhylandwood/bernadette-hyland-semtech-2011-west-linked-data-cookbook
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    U.S. Environmental Protection Agency
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  • 11. Linked Data Basics
    Okay, so how do I use it?
    Query it, just as you would run a SQL query, i.e. SPARQL
    “Find me the capital of all countries in Africa”
    PREFIX abc: <nul://sparql/exampleOntology#> .
    SELECT ?capital ?country
    WHERE {
    ?x abc:cityname ?capital ;
    abc:isCapitalOf ?y.
    ?y abc:countryname ?country ;
    abc:isInContinentabc:Africa.
    }
    http://en.wikipedia.org/wiki/Resource_Description_Framework
    http://www.w3.org/DesignIssues/LinkedData.html
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  • 12. Linked Data and Geo
    So is this linked data stuff all unicorns and rainbows?
    http://en.wikipedia.org/wiki/File:The_Hunt_of_the_Unicorn_Tapestry_7.jpg
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  • 13. Linked Data and Geo
    Linked GeoData
    Some decisions to be made, complexity-dependent
    http://www.w3.org/2003/01/geo/<geo:lat_long>51.4,-0.02</geo:lat_long>
    GeoRSS
    GML
    WKT
    WorldKit
    http://www.w3.org/wiki/GeoRDF
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    U.S. Environmental Protection Agency
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  • 14. Linked Data and Geo
    What’s Going On?
    UK – Ordnance Survey
    http://data.ordnancesurvey.co.uk/.html
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    U.S. Environmental Protection Agency
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  • 15. Linked Data and Geo
    What’s Going On?
    OSM - LinkedGeoData
    http://linkedgeodata.org/About
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    U.S. Environmental Protection Agency
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  • 16. Linked Data and Geo
    What’s Going On?
    GeoNames
    http://www.geonames.org/ontology/documentation.html
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    U.S. Environmental Protection Agency
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  • 17. Linked Data and Geo
    What’s Going On?
    OGC - GeoSPARQL
    http://www.opengeospatial.org/projects/groups/geosparqlswg
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    U.S. Environmental Protection Agency
    17
    SELECT ?f
    WHERE { ?f my:hasPointGeometry ?fGeom .
    ?fGeomogc:asWKT ?fWKT .
    FILTER (ogcf:relate(?fWKT,
    “<http://www.opengis.net/def/crs/OGC/1.3/CRS84>
    Polygon ((-83.5 34.0, -83.5 34.3, -83.1 34.3,
    -83.1 34.0, -83.5 34.0))”^^ogc:WKTLiteral,
    ogc:within))
    }
  • 18. Linked Data and Geo
    What is EPA doing?
    Facility Registry System
    Soon:
    Toxic Release Inventory
    Substance Registry
    Collaborating
    CIO Committee DAS
    SOCOP http://socop.org/
    HHS, USGS
    http://www.w3.org/2011/gld/charter
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    U.S. Environmental Protection Agency
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  • 19. Linked Data Cloud
    Here’s where the Cloud is…
    Where Are You?
    http://richard.cyganiak.de/2007/10/lod/
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    U.S. Environmental Protection Agency
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  • 20. Thanks/Questions
    David G. Smith PE PLS
    USEPA Office of Environmental Information
    202-566-0797
    SmithG.David@epa.gov
    Twitter:@DruidSmith
    6/10/2011
    U.S. Environmental Protection Agency
    20