KEYWORDS: Sensors, Data modeling, Process modeling, Surface plasmons, Web services, Performance modeling, Data processing, Environmental sensing, Flame detectors, Computer security
A common Sensor Web data service framework for Geo-Processing Workflow (GPW) is presented
as part of the NASA Sensor Web project. This framework consists of a data service node, a data
processing node, a data presentation node, a Catalogue Service node and BPEL engine. An abstract
model designer is used to design the top level GPW model, model instantiation service is used to
generate the concrete BPEL, and the BPEL execution engine is adopted. The framework is used to
generate several kinds of data: raw data from live sensors, coverage or feature data, geospatial
products, or sensor maps. A scenario for an EO-1 Sensor Web data service for fire classification is
used to test the feasibility of the proposed framework. The execution time and influences of the
service framework are evaluated. The experiments show that this framework can improve the quality
of services for sensor data retrieval and processing.
KEYWORDS: Web services, Sensors, Data modeling, Standards development, Systems modeling, Telecommunications, Dynamical systems, Data processing, Interfaces, Translucency
The Open Geospatial Consortium, Inc (OGC) Web Services (OWS) were initially primarily simple synchronous Web
services based on the HTTP transport protocol, which is perfectly valid in the case of simple geoprocessing of simple
data available from local sources. However, with the development of Web-based geospatial technologies, especially the
development of the Sensor Web, a number of limitations have been identified with using HTTP-GET/POST binding in
OGC OWS, which cannot meet the needs of asynchronous communication and operations between clients and services
or in OGC services chain. Asynchronicity in Web services could be achieved in different ways. Callback pattern is
widely supported in client asynchronous invocation. Message-based middleware often can be used together with the
asynchronous invocation alternatives. Web Notification Service (WNS) is designed to provide asynchronous messagebased
communication in OGC. This paper describes a mechanism for an asynchronous, message-based, event-driven,
dynamic geospatial Web system based on OGC Web services. The addition of asynchronicity in OGC Web services has
two components. One is the augmentation of OGC Web services with asynchronous message-based notification. The
other is asynchronous OGC Web service orchestration based on BPEL.
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