Linked GeoData - WhereCampDC 20110610
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Transcript of Linked GeoData - WhereCampDC 20110610
04/12/2023U.S. Environmental Protection Agency
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Linked GeoData#WhereCampDC 2011
David G. Smith PE PLSUSEPA Office of Environmental Information
Twitter:@DruidSmith
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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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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Linked Data Cloud
http://richard.cyganiak.de/2007/10/lod/
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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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Linked Data Basics
Tim Berners-Lee: 5-Star model for publishing data
http://www.w3.org/DesignIssues/LinkedData.html04/12/2023 U.S. Environmental Protection Agency 6
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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Linked Data Basics
RDF Structure:
http://en.wikipedia.org/wiki/Resource_Description_Framework
http://www.w3.org/DesignIssues/LinkedData.html
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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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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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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 ?countryWHERE { ?x abc:cityname ?capital ; abc:isCapitalOf ?y. ?y abc:countryname ?country ; abc:isInContinent abc:Africa.}
http://en.wikipedia.org/wiki/Resource_Description_Framework
http://www.w3.org/DesignIssues/LinkedData.html
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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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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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Linked Data and Geo
What’s Going On?• UK – Ordnance Survey
http://data.ordnancesurvey.co.uk/.html
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Linked Data and Geo
What’s Going On?• OSM - LinkedGeoData
http://linkedgeodata.org/About
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Linked Data and Geo
What’s Going On?• GeoNames
http://www.geonames.org/ontology/documentation.html
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Linked Data and Geo
What’s Going On?• OGC - GeoSPARQL
http://www.opengeospatial.org/projects/groups/geosparqlswg
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SELECT ?fWHERE { ?f my:hasPointGeometry ?fGeom .?fGeom ogc: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))}
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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Linked Data Cloud
Here’s where the Cloud is…Where Are You?
http://richard.cyganiak.de/2007/10/lod/
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Thanks/Questions
David G. Smith PE PLS• USEPA Office of Environmental Information• 202-566-0797• [email protected]• Twitter:@DruidSmith
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Topic URLFRS Home Site http://www.epa.gov/enviro/html/fii/FRS Geodata Download http://www.epa.gov/enviro/geo_data.htmlMy Environment http://www.epa.gov/myenvironment/EPA Geospatial Program http://www.epa.gov/geospatial/index.htmlEPA Geodata Gateway https://geogateway.epa.gov/EPA Geo Metadata https://geogateway.epa.gov/EME/