<s>
The	O
Sensor	B-Device
Observation	I-Device
Service	I-Device
(	O
SOS	O
)	O
is	O
a	O
web	O
service	O
to	O
query	O
real-time	O
sensor	O
data	O
and	O
sensor	O
data	O
time	O
series	O
and	O
is	O
part	O
of	O
the	O
Sensor	B-Algorithm
Web	I-Algorithm
.	O
</s>
<s>
The	O
offered	O
sensor	O
data	O
consists	O
of	O
data	O
directly	O
from	O
the	O
sensors	O
,	O
which	O
are	O
encoded	O
in	O
the	O
Sensor	O
Model	O
Language	O
(	O
SensorML	O
)	O
,	O
and	O
the	O
measured	O
values	O
in	O
the	O
Observations	B-Device
and	I-Device
Measurements	I-Device
(	O
O	O
&	O
M	O
)	O
encoding	O
format	O
.	O
</s>
<s>
It	O
also	O
allows	O
easy	O
integration	O
into	O
existing	O
Spatial	O
Data	O
Infrastructures	O
or	O
Geographic	B-Application
Information	I-Application
Systems	I-Application
.	O
</s>
<s>
In	O
2016	O
OGC	O
approved	O
the	O
SensorThings	B-Device
API	I-Device
standard	O
specification	O
,	O
a	O
new	O
RESTful	O
and	O
JSON-based	O
standard	O
provide	O
functions	O
similar	O
to	O
SOS	O
.	O
</s>
<s>
As	O
both	O
SensorThings	B-Device
API	I-Device
and	O
SOS	O
are	O
based	O
on	O
the	O
OGC/ISO	B-Device
19156:2011	I-Device
,	O
the	O
two	O
specifications	O
have	O
been	O
demonstrated	O
in	O
an	O
OGC	O
IoT	O
pilot	O
that	O
they	O
can	O
interoperate	O
with	O
each	O
other	O
.	O
</s>
<s>
GetCapabilities	O
returns	O
an	O
XML	B-Protocol
service	O
description	O
with	O
information	O
about	O
the	O
interface	O
(	O
offered	O
operations	O
and	O
endpoints	O
)	O
as	O
well	O
as	O
the	O
available	O
sensor	O
data	O
,	O
such	O
as	O
the	O
period	O
for	O
which	O
sensor	O
data	O
is	O
available	O
,	O
sensors	O
that	O
produce	O
the	O
measured	O
values	O
,	O
or	O
phenomena	O
that	O
are	O
observed	O
(	O
for	O
example	O
air	O
temperature	O
)	O
.	O
</s>
<s>
The	O
measured	O
values	O
and	O
their	O
metadata	O
is	O
returned	O
in	O
the	O
Observations	B-Device
and	I-Device
Measurements	I-Device
format	O
(	O
O	O
&	O
M	O
)	O
.	O
</s>
<s>
DescribeObservationType	O
returns	O
the	O
type	O
of	O
observation	O
(	O
XML	B-Protocol
Schema	O
)	O
,	O
such	O
as	O
om	O
:	O
Measurement	O
)	O
.	O
</s>
<s>
DescribeResultModel	O
provides	O
the	O
XML	B-Protocol
Schema	O
of	O
the	O
measured	O
value	O
,	O
which	O
is	O
particularly	O
important	O
for	O
complex	O
measurements	O
,	O
such	O
as	O
multi-spectral	O
data	O
.	O
</s>
<s>
There	O
are	O
currently	O
several	O
Open	B-License
Source	I-License
implementations	O
of	O
the	O
service	O
:	O
</s>
