Open Geospatial Consortium Inc. Date: 2006-03-04 Reference number of this document: OGC 06-021r1 Version: 1.0 Category: OpenGIS® Discussion Paper Editors: Mike Botts Alex Robin John Davidson Ingo Simonis OpenGIS® Sensor Web Enablement Architecture Document Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. To obtain additional rights of use, visit http://www.opengeospatial.org/legal/. Warning This document is not an OGC Standard. It is distributed for review and comment. It is subject to change without notice and may not be referred to as an OGC Standard. Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting do Document type: OpenGIS® Interoperability Program Report Document subtype: Discussion Paper Document stage: Approved Document language: English OGC 06-021r1 Contents Page i. Preface.................................................................................................................... iv ii. Submitting organizations ....................................................................................... iv iii. Document contributor contact points..................................................................... iv iv. Revision history.......................................................................................................v v. Changes to the OGC Abstract Specification............................................................v vi. Future work..............................................................................................................v Foreword............................................................................................................................ vi Introduction....................................................................................................................... vii 1 Scope........................................................................................................................1 2 Normative references...............................................................................................1 3 Terms and definitions ..............................................................................................2 4 Conventions .............................................................................................................7 4.1 Abbreviated terms ...............................................................................................7 4.2 UML notation......................................................................................................7 5 Sensor Web Enablement Architecture Overview ....................................................8 5.1 Motivation ...........................................................................................................8 5.2 Approach ...........................................................................................................10 5.3 High level concepts...........................................................................................10 5.4 Example Scenarios ............................................................................................13 6 SWE Architecture Components.............................................................................15 6.1 Information Model............................................................................................15 6.1.1 Observations and Measurements (O&M) [OGC 05-087r2] ..................................17 6.1.2 Sensor Model Language (SensorML) [OGC 05-086r2] ........................................19 6.1.3 Transducer Model Language (TML) [OGC 06-010]............................................22 6.1.4 SWE Common [OGC 05-086r2; OGC 05-087r2]..........................................................24 6.2 Service Model....................................................................................................29 6.2.1 Sensor Observation Service (SOS) [OGC 06-009] ..............................................29 6.2.2 Sensor Alert Service (SAS) [OGC 05-098]..........................................................31 6.2.3 Sensor Planning Service (SPS) [OGC 05-089r2] .................................................33 6.2.4 Web Notification Service (WNS) [OGC 05-114] ...............................................34 6.2.5 Sensor Web Registry.....................................................................................35 7 Interrelationships....................................................................................................38 7.1 Dependencies on and references to SWE Common..........................................38 7.2 Dependencies on and references to SensorML .................................................39 7.3 Dependencies on and references to Observations .............................................39 7.4 Dependencies on and references to TML..........................................................39 ii Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. OGC 06-021r1 7.5 Dependencies on and references to Geography Markup Language (GML) .....39 8 Typical Work Flows ..............................................................................................41 8.1 Discovery of SWE Services using a Registry ...................................................41 8.2 Registration of a new SWE Service in a Registry.............................................42 8.3 Request of discrete observation data.................................................................43 8.4 Request of streaming (out of band) observation data........................................44 8.5 Access to Sensor Descriptions ..........................................................................45 8.6 Data Processing using SensorML......................................................................46 8.7 Subscribing and Receiving Sensor Alerts .........................................................47 8.8 Tasking Sensor Systems....................................................................................49 9 Implementation examples ......................................................................................51 9.1 Using SWE services in a “star” network configuration ....................................51 10 Future Directions...................................................................................................59 10.1 OWS4 Potential SWE Directions......................................................................60 Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. iii OGC 06-021r1 i. Preface Suggested additions, changes, and comments on this Discussion Paper are welcome and encouraged. Such suggestions may be submitted by email message or by making suggested changes in an edited copy of this document. The changes made in this document version, relative to the previous version, are tracked by Microsoft Word, and can be viewed if desired. If you choose to submit suggested changes by editing this document, please first accept all the current changes, and then make your suggested changes with change tracking on. ii. Submitting organizations The following organizations submitted this document to the Open Geospatial Consortium Inc. Image Matters, Inc. University of Alabama in Huntsville University of Muenster iii. Document contributor contact points All questions regarding this document should be directed to the editor or the contributors: CONTACT COMPANY ADDRESS Mike Botts University of ESSC/NSSTC Alabama in Huntsville, AL 35899 Huntsville Alex Robin University of ESSC/NSSTC Alabama in Huntsville, AL 35899 Huntsville John Davidson Image Matters 201 Loudoun St, SW Leesburg, VA 20175 Ingo Simonis University of Robert-Koch-Str. 26-28 Muenster 48149 Muenster Germany Simon Cox CSIRO ARRC Exploration PO Box 1130 and Mining Bentley WA 6102 Australia iv Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. OGC 06-021r1 iv. Revision history Date Release Editor Primary clauses Description modified 2006-01-20 R1 meb throughout Initial draft 2006-02-13 R1 meb, ar throughout completed draft v. Changes to the OGC Abstract Specification The OpenGIS® Abstract Specification does not require changes to accommodate the technical contents of this document. vi. Future work Improvements in this document are desirable to account for status changes in the individual specifications and to outline further use cases within Appendix A. Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. v OGC 06-021r1 Foreword There are no annexes to this document. This is an Informative document that describes the framework surrounding sensor web/network specification described in other OGC documents. Therefore, no Sections nor Annexes in this document are normative. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The OGC shall not be held responsible for identifying any or all such patent rights. vi Copyright © 2006 Open Geospatial Consortium, Inc. All Rights Reserved. OGC 06-021r1 Introduction In much the same way that HTML and HTTP standards enabled the exchange of any type of information on the Web, the Open Geospatial Consortium’s (OGC) Sensor Web Enablement (SWE) initiative is focused on developing standards to enable the discovery, exchange, and processing of sensor observations, as well as the tasking of sensor systems. The functionality that OCG has targeted within a sensor web includes: • Discovery of