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Overview

The “sensor registry” aims at supporting the management of sensors deployed for in-situ measurements. Common sensors or families of sensors are used across different research infrastructures, for example, oxygen optodes that are equipped on platforms in multiple research infrastructures. The goal of this work is to define common methods to access the sensor metadata in such cases.

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The sensor registry is based on OGC Sensor Web Enablement technologies (SWE) that have been developed and implemented by a range of national and European projects and activities. As part of the FP7 and H2020 projects ODIP, ODIP2, Oceans of tomorrow call and the BRIDGES project the Marine SWE profile was developed. The marine SWE profile is a marine specialisation of the OGC SensorML (for metadata) and OGC Observations & Measurements (O&M) standards. A significant advance within these templates was the use of controlled vocabularies to describe terms and values within the SensorML documents. The NERC vocabulary server (NVS, part of the European SeaDataNet infrastructure) was used to host the vocabularies. The vocaularies are the Wxx family of vocabularies and accessible at https://www.bodc.ac.uk/resources/vocabularies/vocabulary_search/. In addition to the human interface the NVS has machine readable access methods including SPARQL and SOAP with outputs including RDF, XML and JSON. The standards developed in the OoT projects are summarised in the SenseOcean project  joint deliverable D7.8 which also included future recommendations for future work.

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These concepts have been used by the Oceanids Command and Control project along with the outcomes of the Marine SWE profile to store and expose the metadata for ocean glider deployments to the web. These metadata are then used to automate the curation and conversion of raw glider data to the EGO NetCDF (http://archimer.ifremer.fr/doc/00239/34980/ ) format which is the data exchange format within the Ocean Glider Network. Oceanids uses a database that supports both SSN and SensorML metadata representations so is strongly aligned with this demonstrator. The same database is being used for historical EMSO data (specifically the PAP site) that is held by BODC and development is on-going to expose the metadata in SensorML and data in O&M formats, this is scheduled to be complete in late 2018.

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Figure 10. Sensor Deployment Graphical Editor and Sensor Model Database for EMSO

Figure 11. Data Model For ANAEE and ICOS Sensor Descriptions

Manage the park of sensor by owner, manage maintenance (e.g. calibrations), loan, …

The recording of a sensor history is now technically possible and facilitated by the SensorML template produced within the Marine SWE profile. To date this has not been fully implemented to the authors knowledge. BODC will be introducing the linking of documentation to SensorML records in the development scheduled prior to March 2019.

Edit deployments, enable traceability from observation data back to the sensor and procedures used for acquisition (link with implementation case on provenance IC_3).

For users of the 52°North software (one of the primary open source OGC SWE software suites) there has been a SensorML editor SMLE (pronounced smilee) that enables users to interact with and edit SensorML documents held in  OGC compliant SOS servers via a graphical user interface (editing is only supported for SOS servers supporting the transactional SOS operations). This is freely available from: https://github.com/52North/smle

Discover infrastructures (observation network, equipped experiment sites...) and enable their citation.

The discovery of infrastructures requires the recently developed federated sensor observation services. These have not been trialed or investigated on the marine domain to the authors knowledge at the time of writing. They may need refinement for the specific requirements of the use case, akin to the Marine SWE profile activity. Work on evaluation of these services was a key recommendation of the OoT projects (see previous reference above).

The citation of sensors is a on-going development activity in a newly formed Research Data Alliance working group on the persistent identification of sensors (https://www.rd-alliance.org/groups/persistent-identification-instruments-wg ).

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• Embed in the standards within sensors or data processing systems to allow the automated processing and dissemination of data
• Standardised machine readable recording and linking of metadata to a data provenance trace
• Inclusion of data in OGC SWE services and endpoints
• The standardised sharing of sensor metadata between organisations and RIs
• The citation of specific sensors (dependent on the results of the RDA working group)

Link to the Demonstrator

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Youtube video is at:https://youtubeyoutu.combe/watch?v=4QxTZ2iiznkheight460

Link to ESONET yellow pages: https://www.esonetyellowpages.com/

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○      An instance of SBE 37-SMP-ODO MicroCAT high-accuracy conductivity and temperature  recorder: http://europa.ogs.trieste.it/OGS_SOS/SensorML_3_0/Sensor_V3_E2M3A_CT.xml

Contributors

• Dr Justin Buck, BODC, juck@bodc.ac.uk
• Dr Simon Jirka, 52°North,  jirka@52north.org

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