GeoQuery Tool to Pose Spatial Queries over the Web
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1 GeoQuery Tool to Pose Spatial Queries over the Web Nancy Wiegand Space Science and Engineering Center University of Wisconsin Madison Geospatial Semantics June 2014
2 Querying Linked Data (RDF) Information is Stored as Triples Subject Predicate Object Subject Predicate Object (Karmy s Airport) is a type of airport (Karmy s Airport) has label Karmy s Airport etc. RDF is queried using the W3C query language called SPARQL. GeoSPARQL adds spatial operators. Wiegand Geospatial Summit April 2014
3 Uniform Resource Identifiers (URIs) Subject Predicate Object Subject Predicate Object Karmy s Airport etc. Wiegand Geospatial Summit April 2014
4 GeoSPARQL Query language for geospatial RDF systems Specification approved by Open Geospatial Consortium (OGC) Technical Committee GeoSPARQL queries allow spatial processing and indexing over Semantic Web datasets (Dave Kolas) SELECT?m WHERE {?p a ex:park; geo:hasgeometry?pgeo.?m a ex:monument; geo:hasgeometry?mgeo.?mgeo geo:sfwithin?pgeo. } Find all Monuments within Parks. (? Denotes a variable)
5 Developed by Professor Ralph Grove at James Madison University with funds from our NSF INTEROP Grant (idea from Professor James Wilson, JMU) Videos Tool for posing GeoSPARQL queries Can perform spatial operations over the Web
6 Uses Parliament s implementation of GeoSPARQL (triple store)
7 Spatial Relationships
8 A query with one feature Find all airports
9 Select Feature Type airportpoint
10 Select Property for airportpoint
11 Type in airport List of airports Spatial results
12 Click on Karmy s Airport to select it, Choose Buffer, See result
13 A query with two features Find the county Karmy s Airport is in
14 Find the county Karmy s Airport is in
15 For Feature 2, Find Karmy s Airport Typing just Kar in the text box finds Karmy s Airport Wiegand Geospatial Semantics 2014
16 Choose SF:Contains to get county containing Karmy s Airport Shenandoah is listed and turns a different color on the map
17 GeoSPARQL Query Find the county name for Karmy s airport: (? Denotes a variable) SELECT?countyName WHERE {?county rdf:type cegis:countyorequivalent.?county rdfs:label?countyname.?county geo:hasgeometry?countygeometry.?countygeometry geo:aswkt?countywkt.?airport rdf:type cegis:airportpoint.?airport rdfs:label Karmy s Airport.?airport hasgeometry?airportgeometry.?airportgeometry geo:aswkt?airportwkt. } FILTER (geof:sfcontains(?countywkt,?airportwkt)).
18 From the GeoSPARQL User Guide Dave Kolas and Robert Battle Spatial Object A feature can have multiple geometries with this model. Feature hasgeometry Geometry
19 Summary: GeoQuery Tool Allows easy querying over the Web for spatial data in RDF format because SPARQL/GeoSPARQL syntax is avoided Geospatial Semantic Web
20 Land Use Code Demo With much appreciation to Tommy Jasmin (SSEC)! (who helped REU students Alec Anderson and Coda Phillips)
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23 Thank you! Nancy Wiegand Geospatial Semantics June 2014
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arxiv: v1 [cs.db] 22 Mar 2016 ABSTRACT
![arxiv: v1 [cs.db] 22 Mar 2016 ABSTRACT](/thumbs/78/78548614.jpg "arxiv: v1 [cs.db] 22 Mar 2016 ABSTRACT")
Efficient Approximation of Well-Designed SPARQL Queries arxiv:163.6732v1 [cs.db] 22 Mar 216 ABSRAC Zhenyu Song szyhw@tju.edu.cn Xin Wang wangx@tju.edu.cn Zhiyong Feng zyfeng@tju.edu.cn Guozheng Rao rgz@tju.edu.cn