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The OGC has just approved a new Interoperability Experiment for Sensor
Alerts. A description is provided for your information. Also, FYI, does include
CAP. Any questions, please let me know. Also, please, your comments and input
would be very much appreciated!
Regards
Carl
Description:
This proposed
Interoperability Experiment (IE) is intended to create a prototype specification
of a Sensor Alert Service (SAS) as a part of the OGC Sensor Web Enablement (SWE)
effort.
Technical Approach:
The SWE Working
Group has recognized that a missing piece of the SWE suite of standards and
proposed standards is an alert and notification mechanism that specifies how
alert or �alarm� conditions are defined, detected, and made available to
interested users. This IE will create a draft alert standard known as the Sensor
Alert Service (SAS). Since this standard will be focused on alerts from sensors
and sensor webs, it will be narrower in scope than a complete Web-wide alerting
service. Therefore it is named Sensor Alert Service rather than Web Alert
Service (WAS).
There is an
existing OGC discussion paper (OGC 03-100) on a proposed WAS that is broader in
scope than the SAS. The SAS is expected to be a small and focused service for
the purpose of handling alert conditions in a sensor web.
After
requirements are defined, the first efforts to define the SAS will include a
survey of existing standards to see if any meet the focused needs of the SAS
requirements. Standards to be considered include, but are not limited to, the
OASIS Web Services-Notification suite (WS-N) and the OASIS Asynchronous Service
Access Protocol (ASAP). It is our intent to embrace existing standards where
appropriate and extend them if necessary, including reporting back to the
respective standards bodies the changes needed to meet our needs and work to get
those changes incorporated into the existing standards. Only if no existing standard meets the
needs of SWE alert handling will a new standard service be defined.
Note that SWE
already includes a discussion paper (OGC-03-008r2) describing the Web
Notification Service (WNS). WNS was designed to permit a client to engage in
asynchronous message interchanges with one or more other services. As such, WNS
does not meet the needs of an alert notification system. SAS does not compete
with WNS. In fact, SAS may, but is not required to, utilize WNS for
notifications.
Carl Reed, PhD
CTO and Executive Director Specification
Program
OGC
The OGC: Helping the World to Communicate Geographically
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