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

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. 6/10/2011 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 6/10/2011 U.S. Environmental Protection Agency 3

4. Linked Data Cloud http://richard.cyganiak.de/2007/10/lod/ 6/10/2011 U.S. Environmental Protection Agency 4

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 6/10/2011 U.S. Environmental Protection Agency 5

6. Linked Data Basics Tim Berners-Lee: 5-Star model for publishing data http://www.w3.org/DesignIssues/LinkedData.html 6/10/2011 U.S. Environmental Protection Agency 6

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 6/10/2011 U.S. Environmental Protection Agency 7

8. Linked Data Basics RDF Structure: http://en.wikipedia.org/wiki/Resource_Description_Framework http://www.w3.org/DesignIssues/LinkedData.html 6/10/2011 U.S. Environmental Protection Agency 8

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 6/10/2011 U.S. Environmental Protection Agency 9

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 6/10/2011 U.S. Environmental Protection Agency 10

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 6/10/2011 U.S. Environmental Protection Agency 11

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 6/10/2011 U.S. Environmental Protection Agency 12

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 6/10/2011 U.S. Environmental Protection Agency 13

14. Linked Data and Geo What’s Going On? UK – Ordnance Survey http://data.ordnancesurvey.co.uk/.html 6/10/2011 U.S. Environmental Protection Agency 14

15. Linked Data and Geo What’s Going On? OSM - LinkedGeoData http://linkedgeodata.org/About 6/10/2011 U.S. Environmental Protection Agency 15

16. Linked Data and Geo What’s Going On? GeoNames http://www.geonames.org/ontology/documentation.html 6/10/2011 U.S. Environmental Protection Agency 16

17. Linked Data and Geo What’s Going On? OGC - GeoSPARQL http://www.opengeospatial.org/projects/groups/geosparqlswg 6/10/2011 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 6/10/2011 U.S. Environmental Protection Agency 18

19. Linked Data Cloud Here’s where the Cloud is… Where Are You? http://richard.cyganiak.de/2007/10/lod/ 6/10/2011 U.S. Environmental Protection Agency 19

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