OpenSensorSearch Discussion Page

Discussion

Related Work

• IETF standard for machine-to-machine discovery using a resource directory > http://tools.ietf.org/html/draft-ietf-core-resource-directory-00
• Metadata Harvesting and Registration in a Geospatial Sensor Web Registry > http://onlinelibrary.wiley.com/doi/10.1111/j.1467-9671.2012.01365.x/abstract
  • A Sensor Web registry acts as a broker in a service-oriented environment to publish and discover Sensor Web resources (e.g. sensors, sensor services, observations, and alerts). The Catalogue Service for the Web (CSW) developed by the Open Geospatial
    Consortium (OGC) defines a standard interface and protocol for publishing and discovering geospatial resources. This article adopts the CSW for the development of a Sensor Web registry. Metadata for Sensor Web resources are registered into the catalogue information model – the ebXML Registry Information Model (ebRIM). In the Sensor Web environment, sensor observations can be available in real-time or near-real-time, and thus metadata registered in CSW need to be updated frequently. This article proposes an incremental harvesting approach, which can harvest the updated metadata efficiently. A prototypical implementtion is provided to demonstrate the applicability of the approach.
• Features of a Registry, see http://www.galdosinc.com/archives/1209
  • history, life cycle
  • SIR makes integration of sensor web architecture into CSW-ebRIM regsitry easy (last paragraph!), maybe build on that argument: SIR as the connector between legacy registry services, and the dynamic (mobile) sensor web
  • Provenance in the Sensor Web
  • Registries – where Spatial is not Special: http://www.galdosinc.com/archives/1235
• Sensor discovery at Opengeo: http://opengeo.org/publications/opengeo-swe/
• Similar Systems that should be integrated or be an inspiration
  • Good design, easy to use: http://oceanids.geoiq.grida.no/home, builds on same software as GeoCommons: http://geocommons.com/searches?query=temperature
  • Provide a link to directly download data, best in a common format such as CSV
  • Maybe link/forward to GeoCommons for data visualisation?
  • Catalan SDI has a Google-Imitation interface, including comments: http://www.ogc.uab.cat/idectalk/index_eng.htm, includes user feedback directly
• Work with GeoCENS
  • Really good map interface using a silverlight UI: http://dev.geocens.ca/pivot_viewer
• RESTful interface
  • simple alpha version, only GET
    • host:port/api/v1/search?q=<free text searchterm>
    • host:port/api/v1/observedProperties/<optional: observed property name>/<optional: UOM>
    • host:port/api/v1/services/<optional: service type>/<optional: service URL>/<optional: sensors>
    • host:port/api/v1/services > needs paging
    • host:port/api/v1/sensors/<sensor id in sir{.xml, .json}?obs=>/<optional: observables> ... /<optional: services>
    • host:port/api/v1/sensors/<optional: service type>/<optional: service URL>/<optional: service specific sensor id>
    • hots:port/api/v1/observedProperty/<optional: observed property name>/<optional: sensors>
    • host:port/api/v1/capabilities
  • beta
    • host:port/api/v1/harvest/<service type>/<service URL>
    • host:port/api/v1/catalogue/<catalogue URL>/<optional push interval> with PUT for ConnectToCatalog and DELETE for DisconnectFromCatalogue
    • host:port/api/v1/status/<sensorid>/<property name>/<property value>/<optional uom>/<optional timstamp>, even interval> with GET and PUT
  • Example for a RESTful API by "pros": http://dev.evrythng.net/overview
  • browsing paradigm as complement to the search paradigm, see semantic geo browser (Semantics Community)
  • SensorML to RDF using REST abfragen > SensorML as Concept Map (ask Arne B. for O&M Concept Map)
  • evaluate CSIRO Timeseries Catalog: http://www.csiro.au/sensorweb2/search/tower%20hill
• Geohash for search and responses: http://geohash.org/, http://en.wikipedia.org/wiki/Geohash
  • Search: allows fuzzy search using less letters, also RESTful - clean URLs
  • Response: Simple encoding for small formats
• Pangaea (http://www.pangaea.de/) is also a kind of sensor regsitry, interesting search result presentation and multiple outputs, see for example http://doi.pangaea.de/10.1594/PANGAEA.454890
  • Simple Search Interface with auto suggest, seems to be partly OpenSearch compatible: http://www.pangaea.de/search?count=10&q=temperature&env=Atmosphere&offset=200
  • Related to hypox project, which also has a simple search interface: http://dataportals.pangaea.de/hypox/index.php?ptype=data&formtype=simple&q_=temperature+
  • Use DOI format to identify their datasets, have dataset collections and citations, comments, ... see http://doi.pangaea.de/10.1594/PANGAEA.772084
    • Track of ship cruises: http://doi.pangaea.de/10.1594/PANGAEA.341208?format=html
  • Implemantation is based on panFMP (Sourceforge: http://sourceforge.net/projects/panfmp), uses Apache Lucene, development seems active: http://panfmp.svn.sourceforge.net/viewvc/panfmp/main/branches/version_1_1/, Apache 2.0 License
  • Have many (!) EU projects they provide the data for: http://www.pangaea.de/projects/