© 2006, Open Geospatial Consortium, Inc. The OGC Sensor Web Enablement framework Simon CoxMike Botts CSIRO Exploration & MiningNational Space Science & Technology Center Perth, Western AustraliaUniversity of Alabama, Huntsville 12 December 2006

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.2

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.3 Sensor Web Vision -1- Sensors will be web accessible Sensors and sensor data will be discoverable Sensor descriptions will use a standard encoding Sensor observations will be delivered using standard encodings Sensor observations will be accessible in real time or from archives, to any legitimate user, over the web with a standard request syntax

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.4 Sensor Web Vision -2- Sensors will be tasked in a standard way Sensors will be capable of issuing alerts based on observations, as well as be able to respond to alerts issued by other sensors Sensor services will be capable of real-time mining of observations to find phenomena of immediate interest Sensors and sensor nets will be able to act on their own (i.e. be autonomous) Software will immediately be capable of geolocating and processing observations from a newly-discovered sensor

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.5 Users—Decision Support Tools - vendor neutral - extensive - flexible - adaptable Providers—Heterogeneous sensor network In-Situ monitors Bio/Chem/Rad Detectors Surveillance Airborne Satellite - sparse - disparate - mobile/in-situ - extensible Models and Simulations - nested - national, regional, urban - adaptable - data assimilation M. Botts Sensor Web Enablement - discovery - access - tasking - alert notification web services and encodings based on Open Standards (OGC, ISO, OASIS, IEEE) Sensor Web Enablement (SWE) Framework

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.6 Integration Of Observations From A Variety Of Sensors We desire the ability to discover and integrate observations from any sensor that meets our needs

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.7 OGC Web Services (OWS) HTTP access to Geospatial informational & computational services –Web services - not web-pages! –Web Map Service Standard syntax for requesting a portrayed map – GetMap, GetFeatureInfo –Web Feature Service Fine-grained data access (XML) – GetFeature, DescribeFeatureType –Web Coverage Service Gridded data subsets, etc. – GetCoverage –Catalogue Service Structured metadata discovery and access – GetRecord –Web Processing Service, Web Terrain Service, Coordinate Transformation Service … Supported by Geography Markup Language (GML) based XML data encodings –i.e. community-based content standards + interface protocols

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.8 OGC Sensor Web Enablement -1- Information Models & Schemas –Observations & Measurements (O&M) Generic observation data model, including in-situ, time-series, imagery “Metadata for value estimates” –Sensor Model Language (SensorML) Detailed description of sensors and processing chains, including georegistration, response models –Transducer Markup Language Low level sensor data streaming and actuator control Standard GML-based encodings

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.9 A common pattern: the observation model An Observation is an Event whose result is an estimate of the value of some Property of the Feature-of-interest, obtained using a specified Procedure The Feature-of-interest concept reconciles remote and in-situ observations

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.10 OGC Sensor Web Enablement -2- Every component exposes a http interface –Supports service chain composition –Sensor Observation Service (SOS) Fine-grained access to sensor observation results GetObservation( ), GetFeatureOfInterest( ), GetResult( ), DescribeSensor(id), … XML document response –Sensor Alert Service (SAS) Subscription to notifications –Sensor Planning Service (SPS) Observation feasibility and tasking –Sensor registries Catalogue service profiles for sensors and services Hide the low-level protocols– e.g. IEEE 1451

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.11 premises: O&M is the high-level information model SOS is the primary information-access interface SOS can serve: an Observation (Feature) –getObservation == “getFeature” (WFS/Obs) operation a feature of interest (Feature) –getFeatureOfInterest == getFeature (WFS) operation or Observation/result (often a time-series == discrete Coverage) –getResult == “getCoverage” (WCS) operation or Sensor == Observation/procedure (SensorML document) –describeSensor == “getFeature” (WFS) or “getRecord” (CSW) operation Sensor service

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.12 SOS vs WFS, WCS, CS/W? WFS/ Obs getFeature, type=Observation WCS getCoverage getCoverage (result) Sensor Registry getRecord SOS getObservation getResult describeSensor getFeatureOfInterest WFS getFeature SOS interface is effectively a composition of (specialised) WFS+WCS+CS/W operations e.g. SOS::getResult == “convenience” interface for WCS

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.13 Applications Environmental & emergency-response scenarios –4 × OGC interoperability testbeds Wildfire detection and reporting –NASA Ames –CSIR South Africa Geoscience data archives –Geochemistry (assay) & Geochronology data – Australia –Geology field observations – IUGS collaboration Water resources monitoring & simulation –Australia, Germany Oceans, Atmospheres –UK NERC Geophysics –Upcoming …

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.14 OGC SWE Status Specification documents –O&M RFC Dec 2006, v1 June 2007 ISO/TC 211 NWIP July 2007 –SensorML RFC June 2006, v1 March 2007 –TransducerML RFC June 2006, v1 March 2007 –SOS RFC June 2006, v1 March 2007 –SPS RFC June 2006, v1 March 2007 –SAS Best Practices paper –WNS Discussion paper OGC Web Services testbeds –OWS 4 SWE thread June 2006 to December 2006 (demo last week) –OWS 5 SWE thread Planning now for 2007

Helping the World to Communicate Geographically © 2006, Open Geospatial Consortium, Inc.15 Links + answers SWE Updates – SensorML updates – – TransducerML updates – – O&M updates – –