Database Reference
In-Depth Information
Observed
Estimated
08 09 10 11 12 13 14 15 16 17 18 19
2008-02-09 15:00
Figure 10.7
(See color insert following page 224.) Main stages in the in-
tegration of sensor and model-generated data streams. Left: Estimated ETo
map for the current hour; Center: Eco-regions and station locations overlayed;
Right: Real-time charts for selected locations including the model prediction
for a several-hour period and the actual observed values until current time.
example). For this component, we use sensor web enablement (SWE)-related
technologies. As already indicated in Section 10.2, both static and real-time
sensor data can be provided through the Sensor Observation Service (SOS)
interface; however, here we focus on representative sensor definitions and pos-
sible real-time access mechanisms. Following the SOS interface, a provider
generates a capabilities document as shown in Figure 10.5. A DescribeSensor
request for a particular detector produces a SensorML document describing
the instrument that generates the stream. Figure 10.8 is a schematic depic-
tion of part of a SensorML document for ETo measurements from a weather
station system.
The response to a GetObservation request is an O&M document including
a hyperlink that allows the client to open a connection to the data stream.
An example of an O&M observation document is shown in Figure 10.9. A
realization architecture would utilize a middleware data stream system as the
sml:SensorML
sml:Sensor: id =
CIMIS S33 ETO
name =
CIMIS STATION 33 ETO
Identification,
Classification
ReferenceFrame
Input: name =
eto
Quantity:
urn:ogc:def:phenomenon:eto
Output: name =
eto
Quantity:
urn:ogc:def:phenomenon:eto
Figure 10.8
Schematic SensorML document describing measured ETo.
