Difference between revisions of "LinkedSensorData"
| Line 42: | Line 42: | ||
==Example Query== | ==Example Query== | ||
| − | Find all sensors that detected freezing temperatures on April 1, 2003, between 1:00am to 3:00am. | + | Find all locations (in Geonames) with nearby sensors that detected freezing temperatures on April 1, 2003, between 1:00am to 3:00am. |
prefix om-owl:<http://knoesis.wright.edu/ssw/ont/sensor-observation.owl#> | prefix om-owl:<http://knoesis.wright.edu/ssw/ont/sensor-observation.owl#> | ||
| Line 51: | Line 51: | ||
prefix owl-time:<http://www.w3.org/2006/time#> | prefix owl-time:<http://www.w3.org/2006/time#> | ||
| − | SELECT DISTINCT ?sensor | + | SELECT DISTINCT ?location ?sensor |
WHERE { | WHERE { | ||
?observation om-owl:procedure ?sensor . | ?observation om-owl:procedure ?sensor . | ||
| + | ?sensor om-owl:hasLocatedNearRel ?locatedNear . | ||
| + | ?locatedNear om-owl:hasLocation ?location . | ||
?observation rdf:type weather:TemperatureObservation . | ?observation rdf:type weather:TemperatureObservation . | ||
?observation om-owl:samplingTime ?time . | ?observation om-owl:samplingTime ?time . | ||
Revision as of 01:16, 3 June 2010
Datasets part of the Semantic Sensor Web and STT project at Kno.e.sis.
Linked Sensor Data
LinkedSensorData is an RDF dataset containing expressive descriptions of ~20,000 weather stations in the United States. The data originated at MesoWest, a project within the Department of Meterology at the University of Utah that has been aggregating weather data since 2002.[1] On average, there are about five sensors per weather station measuring phenomena such as temperature, visibility, precipitation, pressure, wind speed, humidity, etc. In addition to location attributes such as latitude, longitude, and elevation, there are also links to locations in Geonames that are near each weather station. This sensors description dataset is now part of the LOD.
Linked Observation Data
LinkedObservationData is an RDF dataset containing expressive descriptions of hurricane and blizzard observations in the United States. The data originated at MesoWest, a project within the Department of Meterology at the University of Utah that has been aggregating weather data since 2002.[2] The observations collected include measurements of phenomena such as temperature, visibility, precipitation, pressure, wind speed, humidity, etc. The dataset includes observations within the entire United States during the time periods that several major storms were active -- including Hurricane Katrina, Ike, Bill, Bertha, Wilma, Charley, Gustav, and a major blizzard in Nevada in 2002. These observations are generated by weather stations described in the LinkedSensorData dataset introduced above. Currently, this dataset contains around one billion triples.
| Name | Storm Type | Date | #Triples | #Observations | Download |
|---|---|---|---|---|---|
| ALL | 1,730,284,735 | 159,460,500 | |||
| Bill | Hurricane | August 17 - August 22, 2009 | 231,021,108 | 21,272,790 | gzip |
| Ike | Hurricane | September 1 - September 13, 2008 | 374,094,660 | 34,430,964 | gzip |
| Gustav | Hurricane | August 25 - August 31, 2008 | 258,378,511 | 23,792,818 | gzip |
| Bertha | Hurricane | July 6 - July 17, 2008 | 278,235,734 | 25,762,568 | gzip |
| Wilma | Hurricane | October 17 - October 23, 2005 | 171,854,686 | 15,797,852 | gzip |
| Katrina | Hurricane | August 23 - August 30, 2005 | 203,386,049 | 18,832,041 | gzip |
| Charley | Hurricane | August 9 - August 15, 2004 | 101,956,760 | 9,333,676 | gzip |
| Blizzard | April 1 - April 6, 2003 | 111,357,227 | 10,237,791 | gzip |
Data Access
- Browse: Pubby Browser
- Query: Virtuoso SPARQL Endpoint
Example Query
Find all locations (in Geonames) with nearby sensors that detected freezing temperatures on April 1, 2003, between 1:00am to 3:00am.
prefix om-owl:<http://knoesis.wright.edu/ssw/ont/sensor-observation.owl#> prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> prefix weather:<http://knoesis.wright.edu/ssw/ont/weather.owl#> prefix sens-obs:<http://knoesis.wright.edu/ssw/> prefix xsd:<http://www.w3.org/2001/XMLSchema#> prefix owl-time:<http://www.w3.org/2006/time#> SELECT DISTINCT ?location ?sensor WHERE { ?observation om-owl:procedure ?sensor . ?sensor om-owl:hasLocatedNearRel ?locatedNear . ?locatedNear om-owl:hasLocation ?location . ?observation rdf:type weather:TemperatureObservation . ?observation om-owl:samplingTime ?time . ?time owl-time:inXSDDateTime ?xsdtime . ?observation om-owl:result ?result . ?result om-owl:floatValue ?value . ?result om-owl:uom weather:fahrenheit . FILTER(?value <= "32.0"^^xsd:float) FILTER(?xsdtime >= "2003-04-01T01:00:00^^http://www.w3.org/2001/XMLSchema#dateTime") FILTER(?xsdtime <= "2003-04-01T03:00:00^^http://www.w3.org/2001/XMLSchema#dateTime") }
