I t ti th OGC S W bIntegrating the OGC Sensor Web Enablement Framework into the OGC Catalogue

Simon Jirka, Daniel Nüst, Jan Schulte(Westfälische Wilhelms-Universität Münster)(Westfälische Wilhelms-Universität Münster)

Frédéric Houbie(ERDAS)(ERDAS)

Overview• Introduction• Sensor Discovery• Sensor Discovery

– ElementsArchitecture– Architecture

• SensorML Discovery Profile• SensorML-ebRIM Mapping• Catalogue Linkg• Outlook and Conclusion

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Introduction• Sensor networks are used in a broad range of

applicationsapplications• OGC Sensor Web Enablement: Integration of

sensors into SDIssensors into SDIs• Discovery functionality currently missing in

th SWE f kthe SWE framework• Full integration into SDI needs Catalogue

support for SWE

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Sensor Discovery• Sensor discovery comprises

– Searching for sensorsSearching for sensors– Searching for sensor data – Searching for Sensor Web services– Searching for Sensor Web services

• Most important search criteriaTi– Time

– SpaceOb d t– Observed property

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Sensor Discovery - Elements

• Describe the metadata of sensors SensorML Discovery Profile SensorML Discovery Profile

• (Automatically) collect metadata of sensors Harvesting metadata from SWE services Harvesting metadata from SWE services

• Support the dynamic structure of sensor t knetworks

Handling of sensor status information• OGC Catalogue integration Transform SensorML into Catalogue Data Models

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g

Sensor Discovery Architecture

OGC Catalogue

Aggregated Sensor Metadata

Lower Level Sensor RegistrySensor

Metadata (Push)

GetCapabilitiesDescribeSensor

Sensor SWE Service

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SensorML Discovery Profile• Need for a common metadata encoding for

sensor metadatasensor metadata• SensorML is the relevant OGC standard for

describing sensorsdescribing sensors• Due to the generic character of SensorML a

fil i d d th t d fiprofile is needed that defines – a minimum set of metadata – a structure how to provide the minimum set of

metadataF l d fi iti i S h t

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• Formal definition using Schematron

SensorML Discovery Profile

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SensorML-ebRIM Mapping• SensorML is not supported as a data model

for OGC Cataloguesfor OGC Catalogues• Approach: Provide an according Catalogue

extensionextension• Mapping of SensorML to the ebRIM

C t l I f ti M d lCatalogue Information Model• Definition of object types, associations,

attributes• OGC Discussion Paper

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Catalogue Link• Lower level registry

– Harvesting of sensor metadataHarvesting of sensor metadata– Management of sensor status data

• Metadata within the lower level registry too• Metadata within the lower level registry too detailed for Catalogues aggregationC i f t d t t bRIM• Conversion of sensor metadata to ebRIM XSLT

• Lower level registry pushes (aggregated and) converted metadata into the Catalogue

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Catalogue Link

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Outlook and Conclusion• Prototype available• Ongoing specification process• Ongoing specification process

– SensorML Discovery ProfileSensorML ebRIM Mapping– SensorML-ebRIM Mapping

• Work will be continued: EO2HEAVEN• Closing one of the last gaps for fully

integrating SWE into SDIs

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Thank you for your attention!More information:

http://sensorweb uni-muenster dehttp://sensorweb.uni muenster.dehttp://52north.org/swejirka@52north orgjirka@52north.org

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