Source:
18th World IMACS / MODSIM Congress, Modelling and Simulation Society of Australia and New Zealand and International Association for Mathematics and Computers in Simulation, Cairns, Australia, p.966-972 (2009)
ISBN:
978-0-9758400-7-8
URL:
http://www.mssanz.org.au/modsim09/C4/havlik.pdf
Keywords:
Sensor Web Enablement (SWE), Sensor Observation Service (SOS), Environmental Information Systems(EIS)
Abstract:
The Sensor Service Architecture (SensorSA) developed by the Sensors Anywhere (SANY)
Integrated Project demonstrates the feasibility of building full-fledged Environmental Information Systems
without proprietary protocols. In a quest for maximal interoperability, the SensorSA embraces the sensor specific
service interfaces, data encodings and XML schemata of the OGC Sensor Web Enablement (OGC
SWE) framework of open standards. In particular, the real-time and archived observations from sensors and
other sensor-like data sources are published through OGC Sensor Observation Service (SOS).
Unfortunately, the OGC SWE does not foresee any standard mechanisms for data replication, caching and
offsetting the load to a higher level service (cascading). In this article, we discuss the need for caching,
replication and service cascading in Environmental Information Systems; demonstrate how to support these
tasks within the frame of the current (v1.0) SOS specification, and propose simple extensions that could
greatly improve the efficiency and robustness of SOS cascading and replication.
In order to simplify the problem at hand, we presume that most SOS operations responses can be adequately
handled through existing HTTP caching mechanisms and concentrate on a simplified problem of pre-fetching
and caching the response to "Get Observation" operation.
Notes:
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