VOEvent Ontology Queries

1
VOEvent Ontology Queries

• Elizabeth Auden
• AstroGrid, Mullard Space Science Lab
• VOTech DS5 Reports
• 4th September 2006
• Strasbourg Astronomical Observatory

2
VOEvent Ontology Use Cases

• Find all solar flares of x-ray class M or higher
• Find all solar flares or coronal mass ejections
  between two dates
• Find all coronal mass ejections occurring within
  24 hours of a solar flare

3
Schemas to Ontologies

• VOEvent1.1.owl OWL-DL ontology hand constructed
  from VOEvent 1.1 schema (May 2006, updated August
  2006)
• http//wiki.eurovotech.org/twiki/bin/view/VOTech/V
  oEventOntology
• STC1.3.owl OWL-DL ontology hand constructed from
  STC 1.3 schema (May 2006)
• http//wiki.eurovotech.org/twiki/bin/view/VOTech/S
  tcOntology

4
Solar VOEvent Packets

• 35,170 solar VOEvent 1.1 packets generated from 3
  solar catalogues
• NOAA GOES mission solar x-ray flares 1999-2006
• BATSE solar x-ray flares 1991 2000
• SOHO LASCO coronal mass ejections 1996 2005
• VOEvent packets stored as individual XML files on
  msslxx.mssl.ucl.ac.uk

5
VOEvent XML to N3

• For testing, event-specific elements were
  extracted from the VOEvent XML packets and
  encoded as N3
• Start / stop date
• Spectral info
• References
• Parameters
• Event concept
• Event IVORN

BATSE7372 a voeVOEvent voeivorn
"ivo//mssl.ucl.ac.uk/BATSEBATSE7372"
voehasName "BATSE 7372"
voehasStartTime "2000-05-26T180300"
voehasStopTime "2000-05-26T180400"
voehasHiLimit 25 voehasLoLimit 300
voehasSpectralUnit "keV"
voehasReference "ftp//umbra.nascom.nasa.gov/pub/
batse/batseplots/batse_7372.ps"
voehasPeakCountsPerSeconds "487"
voehasConcept "Solar Flare".
6
Quaestor SPARQL Endpoint

• Norman Grays SPARQL endpoint Quaestor 0.4 beta
  installed on msslxv.mssl.ucl.ac.uk.
• MSSL Quaestor VOEvent knowledge base
• Created with HTTP PUT upload of knowledge base
  N3 description to MSSL Quaestor
• VOEvent 1.1 OWL-DL ontology uploaded to
  knowledge base with HTTP PUT
• Alpha version 1 instance file of solar events
  described in N3 uploaded with HTTP PUT

7
Quaestor SPARQL Endpoint
8
VOEvent SPARQL Queries

• SPARQL queries performed against Quaestor
  knowledge base containing ontology and solar
  event instance file.
• SPARQL query files submitted using HTTP POST
• Return all events basic query to list all
  events in instance file.
• Return all coronal mass ejections query on
  ontology element hasConcept Coronal Mass
  Ejection
• Return all solar xray flares of class M or
  higher query using ontology inference of x-ray
  flare and x-ray class M

9
SPARQL Query Get Flares
prefix voe lthttp//eurovotech.org/VOEvent1.1.owl
gt select ?name ?concept where ?voevent
voehasConcept ?concept . ?voevent
voehasConcept "Solar Flare" . ?voevent
voehasName ?name
Query
---------------------------------------------
name concept

"NOAA_xray_20000524_1928" "Solar Flare"
"BATSE 7366" "Solar Flare"
"NOAA_xray_20000525_0744" "Solar Flare"
"NOAA_xray_20000524_0908" "Solar Flare"
"NOAA_xray_20000525_0728" "Solar Flare"
"NOAA_xray_20000524_2104" "Solar Flare"
"BATSE 7370" "Solar Flare"
"BATSE 7371" "Solar Flare"
"NOAA_xray_20000524_1615" "Solar Flare"
"NOAA_xray_20000524_1757" "Solar Flare"
"NOAA_xray_20000525_0207" "Solar Flare"
"NOAA_xray_20000525_1132" "Solar Flare"
"BATSE 7369" "Solar Flare"
"NOAA_xray_20000524_1140" "Solar Flare"
"BATSE 7372" "Solar Flare"
"BATSE 7367" "Solar Flare"
"BATSE 7368" "Solar Flare"
---------------------------------------------
Results
10
SPARQL Query Get CMEs
prefix voe lthttp//eurovotech.org/VOEvent1.1.owl
gt select ?name ?concept ?linearspeed
?starttime where ?voevent voehasConcept
?concept . ?voevent voehasConcept "Coronal
Mass Ejection" . ?voevent voehasLinearSpeed
?linearspeed . ?voevent voehasStartTime
?starttime . ?voevent voehasName ?name
Query
Results
--------------------------------------------------
---------------------------------------------
name concept
linearspeed starttime


"LASCO20000524T103011_308" "Coronal Mass
Ejection" "521" "2000-05-24T103011"
"LASCO_20000524T090605_339" "Coronal Mass
Ejection" "244" "2000-05-24T090605"
"LASCO20000525T033005_197" "Coronal Mass
Ejection" "460" "2000-05-25T005405"
"LASCO20000524T165405_301" "Coronal Mass
Ejection" "618" "2000-05-24T165405"
"LASCO20000524T140605_277" "Coronal Mass
Ejection" "575" "2000-05-24T140605"
"LASCO20000525T005405_299" "Coronal Mass
Ejection" "420" "2000-05-25T005405"
------------------------------------------------
-----------------------------------------------
11
SPARQL Query Operations
Numerical Query CME linear speed gt 400 km/s
prefix voe lthttp//eurovotech.org/VOEvent1.1.owl
gt select ?name ?concept ?starttime
linearspeed where ?voevent voehasConcept
?concept . ?voevent voehasConcept "Coronal
Mass Ejection" . ?voevent voehasStartTime
?starttime . ?voevent voehasLinearSpeed
?linearspeed . ?linearspeed
opnumeric-greater-than 400 . ?voevent
voehasName ?name
Date Query flares observed after 25th May 2000
prefix voe lthttp//eurovotech.org/VOEvent1.1.owl
gt select ?name ?concept ?starttime where
?voevent voehasConcept ?concept . ?voevent
voehasConcept Solar Flare" . ?voevent
voehasStartTime ?starttime . ?startTime
opdateTime-greater-than "2000-05-25T000000" .
?voevent voehasName ?name
12
Ongoing Work

• Increase community relevance
• Include astronomical and solar event inferences
  in event type ontology
• Test VOEvent SPARQL queries against OGLE and GCN
  feeds
• Java GUI containing pre-defined VOEvent SPARQL
  queries and text box for advanced users to define
  their own queries
• Solar specific demonstrate solar VOEvent SPARQL
  queries at HELAS meeting at end of September

13
Ongoing Work

• Ontology development
• Define VOEvent knowledge base with multiple
  ontologies VOEvent 1.1, STC 1.3, and
  hand-constructed event type ontology
• Convert VOEvent XML files to individual N3
  instances (using XSLT or GRDDL)
• Increase number of VOEvent and STC elements
  encoded in event N3 instances
• Integrate work on UCD ontology effort to enhance
  ltparamgt queries

14
Ongoing Work

• VOTech interoperability
• Investigate rdfstore module to submit SPARQL
  queries to remote VOEvent repositories instead of
  instance file in Quaestor knowledgebase test
  with VOEvent RSS feed
• PLASTICize java interface to offer option to load
  URLs contained in VOEvent Reference elements in
  applications such as TOPCAT or Aladin.
• Solar-specific application load series of FITS
  images between event start and stop times into
  the SDO streaming tool to watch event in movie
  mode.

15
Remote SPARQL Queries
Quaestor VOEvent KB (MSSL)
SPARQL Query (curl or GUI)
VOEvent Solar flares
STC 1.3
VOEvent CMEs
VOEvent 1.1
VOEvent GRBs
Event Type
16
Conclusions

• VOEvent 1.1 and STC 1.3 ontologies completed P
• VOEvent packets generated for solar flares and
  coronal mass ejections P
• Quaestor SPARQL endpoint used to query these
  solar events with regards to VOEvent ontology P
• Future work expand event-related inferences,
  provide GUI for user queries, migrate to queries
  on remote VOEvent repositories