X-GSN in OpenIoT SummerSchool

-

© Copyright 2013OpenIoT Consortium

EU OpenIoT ProjectFP7 ICT-2011 1.3: Internet-connected Objects

Open Source blueprint for largescale self-organizing cloud

environments for IoT applications

OpenIoT X-GSN

OpenIoT Summer School, Galway, August 5, 2014

Jean-Paul CalbimonteEPFL, Switzerland

Open Source blueprint for large scale self-organizingcloud environments for IoT applications

© Copyright 2013OpenIoT Consortium 2

Outline

• Why GSN• Global Sensor Networks in a nutshell

– Virtual Sensors– Wrappers– Processing classes– Distributed processing– Storage– Services

• X-GSN in OpenIoT– Semantics– Sensor & Observation annotations– Linked Sensor Middleware



Sensor deployments everywhere

MountainsGlaciersSnow regionsSea CoastalAgriculture…

DIYMobileParticipatory



We want the data

• Open data repositories• Accessible research datasets• Discoverability• Reuse datasets• Metadata access



Sensor Networks and the Web

5

Sensor Networks

users

applicationsdata

streams

Volume

VelocityVariety WEB

Universal Web-based access to Sensor data



Motivation

6

from Sensor Networks

to the Sensor Web



GSN: Global Sensor Networks



GSN: Global Sensor Networks

Help managing sensor datasets

Help publishing the data

Help making the data discoverable and reusable



GSN: things to know

GSN

GSN exposes Virtual Sensors

Sensing Device

temp_vstimed: datetimetemperature: float

Virtual Sensor

GSN

Sensing Device

temp_vstimed: datetimetemperature: float

Virtual SensorAggregate, process, fusion

A virtual sensor, any kind of data producer

a real sensor, a wireless camera, a desktop computer, GPS sensor, network traffic, etc.

combination of other virtual sensors.Logical view of the sensor network.Described in an XML file



Virtual Sensor Config

<virtual-sensor name="testsensor_1" priority="10" > <processing-class> <class-name>org.openiot.gsn.vsensor.LSMExporter</class-name> <output-structure> <field name="noise" type="double" /> </output-structure> </processing-class> <description>sensorscope station</description> <life-cycle pool-size="10"/> <streams> <stream name="input1"> … <query>select timed, noise as noise from source1</query> </stream> </streams></virtual-sensor>

Virtual sensor name

Streams & wrappers

data fields



GSN: things to know

GSN

Virtual Sensors get the data through wrappers

wra

pper

Examples:•HTTP generic wrapper•Serial forwarder wrapper•USB camera wrapper•RFID wrapper•WiseNode wrapper•Generic UDP wrapper•Generic serial/bluetooth wrapper•CSV wrapper

Or implement your own wrapper:

50RFID reader (TI)

50Generic HTTP

300Wired camera

180Generic serial

45Generic UDP

75WiseNode

160TinyOS

Lines of codeWrapper type



Wrapper config

<address wrapper="csv"> <predicate key="file">data/station_1061.csv</predicate> <predicate key="fields">timed, noise</predicate> <predicate key="formats">timestamp(d/M/y H:m), numeric</predicate> <predicate key="bad-values">NaN,6999,-6999,null</predicate> <predicate key="timezone">Etc/GMT-2</predicate> <predicate key="sampling">5000</predicate> <predicate key="check-point-directory">csv-check-points</predicate></address>

Wrapper typeFile location

Fields



GSN: things to know

GSN

Virtual Sensors produce streams of data

Streams are processed on the fly by a Processing Class

Data ProcessingFilteringAggregationOutlier detectionStoringPublishingExpensive processing.Archiving



GSN: things to know

• GSN works in a distributed fashion– Data can be kept locally– Break data silos

• Put sensor data on the web

14

GSN nodes

Remote wrappers can get data from another GSN instance



GSN Distributed Deployment

15

Integrity ServiceAccess Control

GSN/Web/Web-ServicesNotification Manager

Query ProcessorQuery RepositoryStorage Manager

Virtual Sensor ManagerInput Stream Manager

Stream Quality ManagerLife Cycle Manager

Pool Of Sensing Devices



Motivation

16


to the Sensor Web



Heterogeneity problems

17

Discoverability

Heterogeneity

Metadata quality

Integration



Querying the semantic sensor Web

18

e.g. publish sensor data as RDF/Linked Data?

URIs as names of thingsHTTP URIs

useful information when URI is dereferenced

Link to other URIs

users

applications

WEB

Use ontology models to continuously query real-time data streams originated from sensors?

static vs. streams

one-off vs. continuous



The OpenIoT Architecture

Sensor data management

Semantic data

management



We need ontologies!



We need ontologies!



X-GSN Sensor annotation

sensorName=opensense_1sourceType=lausannesensorType=lausanneinformation=Air Quality Sensors from Lausanne station 1author=opensensefeature="http://lsm.deri.ie/OpenIoT/opensensefeature"fields="humidity,temperature"field.temperature.propertyName="http://lsm.deri.ie/OpenIoT/Temperature"field.temperature.unit=Cfield.humidity.propertyName="http://lsm.deri.ie/OpenIoT/Humidity"field.humidity.unit=Percentlatitude=46.529838longitude=6.596818



X-GSN Observation annotations



Motivation

24


to the Sensor Web

and the Semantic Sensor Web

-

© Copyright 2013OpenIoT Consortium

EU OpenIoT ProjectFP7 ICT-2011 1.3: Internet-connected Objects

Open Source blueprint for largescale self-organizing cloud

environments for IoT applications

OpenIoT X-GSN

OpenIoT Summer School, Galway, August 5, 2014

Jean-Paul CalbimonteEPFL, Switzerland

Science

X-GSN in OpenIoT SummerSchool