Image Processing Reference
In-Depth Information
Sensor network without
Web access
Web-based sensor
Application
Communication
proxy
Service registry
Sensor
observation
service
Sensor planning
service
Observation
repository
FIGURE .
Simplified communication structure for networks based on SWE.
has more than member companies. Some of these important partners are Google, Microsoft,
NASA, and ORACLE.
heSensorWebEnablement(SWE)isoneproject,withtheobjectivetodiscoverandaccesssensor
nodes by standardized interfaces. The defined specifications describe sensor data types, discovery
procedures, and communication stacks. Figure . shows the simplified communication structure
of a SWE network. he dotted lines show the direct and near real-time communication channels. he
integration of very small or non-Web-based devices with a communication proxy is also feasible. he
common client interface allows a single interface for applications to access all sensor nodes which are
compatible with SWE.
Currently, SWE is divided into seven candidate specifications he ive main specifications are pre-
sented in Sections ... through .... ....The description is based on XML which allows processing
from any kind of sensor data based on time and location of any phenomenon.
12.3.9.1 Observations and Measurements
The observations and measurements (O&M) specification is a flexible aggregation of standard con-
structs that provide description, exchanging, and planning of measurements and observations. Due
to the extensibility of XML, unknown devices or physical effects as well as their units can be flexi-
bly described. he O&M specification defines an observation as an event describing a phenomenon.
It contains triggering time, current position, and the device detecting the event.
12.3.9.2 Sensor Model Language
The sensor model language (SensorML) is a model for discovery, exploration, and exploitation of
sensor nodes and sensor observations. With SensorML it is possible to describe all kinds of measure-
ments and post-measurement processings as a process model in XML. herefore, a description of a
sensor node is a functional model of different process models. Each model has standard inputs, out-
puts, and parameters which can be used by applications for automated exploration of process models.
Furthermore, additional metadata is included to enable discovery and human assistance.
