Swiss Experiment Progress Report 2011 ETHZ/TIK

Jan Beutel, Tonio Gsell, Roman Lim, Mustapha Yuecel, Christoph Walser, Matthias Keller, Bernhard

Buchli, Josua Hunziker, Felix Sutton, Lothar Thiele, ETH Zurich

PermaSense Low-Power Sensor Network Technology

PermaSense – System Architecture

• Support for multiple sensor types

• Wireless sensor network– Ultra low-power data gathering

(Dozer)

• CoreStation– Embedded Linux (Gumstix)– 4 GB local storage, data duplication– WLAN/GPRS connectivity, backup

modem– Solar powered

• Data backend– Streaming interface with metadata

(GSN)– Standard internet services for

monitoring

At the Core – Low-power Wireless Sensors

• Static, low-rate sensing (2 min)

• Temperature profiles, crack meters, resistivity

• 3 years operation• < 0.1 Mbyte/node/day

[Beutel, IPSN 2010]

CoreStation - Embedded Linux & WLAN Router

Gumstix Verdex

TinyNodeGSM

WLAN Router

EMP Protectors

IP68 Enclosure and Connectors

[Buchli, IPSN 2011]

PermaSense Deployment Sites 3500 m a.s.l.

A scientific instrument for precision sensing and data recovery in environmental extremes

PermaSense Tech Transfer:Soil Moisture Sensing on the ThurCCES/RECORD

Custom Built Quad Decagon 5TE Soil Moisture Probes

CoreStation Installation on Existing RECORD Tower

• Redundant connectivity (GPRS/WLAN)

• Webcam• Local WLAN access for researchers (essid RECORD-THUR)

• Online GSN data management• Operational since March 2010~10 Mio data points collected

• Joint work with RECORD (P. Schneider, M. Schirmer, EAWAG)

Matter Valley WLAN

Collaborative Field Site Data

Access&

Maintenance

Long-haul Communication – Directional WLAN

• Data access from weather radar on Klein Matterhorn

• Leased fiber/DSL from Zermatt Bergbahnen AG

• Commercial components (Mikrotik)• Weatherproofing• Collaboration with APUNCH (P. Burlando, ETHZ), COGEAR (S. Löw, ETHZ), BAFU and Ct. Valais

• Collaborative maintenance• Monitoring infrastructure

Matter Valley WLANInfrastructure

• 54 Mbit/sec 802.11a• PPP tunnel to ETHZ• Local (W)LAN access for

researchers• Sites serviced

– X-Band Radar (APUNCH)– Matterhorn Hörnliridge

(PermaSense, COGEAR)– Hörnlihütte– Randa Rockfall (COGEAR)– Dirruhorn Rockglacier

(nano-tera.ch X-Sense)– Grabengufer Rockglacier

(nano-tera.ch X-Sense)

Sensor Hosting Services &

Support

Alpine L1/L2 GPS Reference Network

• Leica GPS1200+ receiver• WLAN access• Solar power• Weatherproofing• Field site installation

support

• Trial campaign in Jul/Aug 2010– Rainfall detection

• Online since– Matterhorn – Dec 2010– Randa Rockfall – May 2010

• Collaboration with COGEAR/APUNCH (A. Geiger, S. Löw, P. Burlando, ETHZ)

Computer Engineering and NetworksTechnische Informatik und Kommunikationsnetze

GSN Data Integration

Data Management – Online Semantic Data

• Global Sensor Network (GSN)– Data streaming framework from EPFL– Organized in “virtual sensors”, i.e. data types/semantics– Hierarchies and concatenation of virtual sensors enable on-line

processing– Translates data from machine representation to SI values– Adds metadata

Private

PublicMetadata============PositionSensor typeValidity period…

Import from field GSN GSN Web export

Multi-Site, Multi-Station, Multi-Revision Data…

Metadata Change Management

• Simple exchange of sensor hw/sw at runtime• Metadata annotated in text files• Wiki-based metadata possible -> integration effort

Issue – Data Quality and Integrity

• Since 07/2008: ~150’000’000 data points

• Inconsistencies– Between timestamps and sequence numbers

• Duplicates• Data gaps

– Sporadic– Systematic

Revision / Extension June 2010Service 2009Installation & Service 2008

Sensornode 20 - 22 new installiation

[Keller, SenSys 2009, IPSN 2011]

Mitigating Data Loss – Backlog Architecture

• Backlog = Auxiliary data aggregation layer on the field site

• Data sink for surrounding sensor nodes• Reliable (flow controlled) synchronization to GSN• Extensible plugin functionality• Schedulable plugin/script execution, remote controlled by

GSN

GSN New Functionalities

• Metadata Mapping Architecture

• BackLog integration, GPS and Vaisala WXT520 data wrappers

• Image manipulation• Binary storage on file system (or database)• Remote scheduling facilities• Frontend enhancements (network topology, log tab,

plotting tools)• GSN/MySQL performance statistics• Lots of enhancements and bug fixes

PermaSense Field Site Visit – June 2010 – 20 People

Interested in more?

http://www.permasense.ch

• ETH Zurich– Computer Engineering and Networks Lab– Geodesy and Geodynamics Lab– Hydrology and Water Resources

Management– Geological Institute– Laboratory of Hydraulics, Hydrology and

Glaciology

• University of Zurich– Department of Geography

• EPFL– Distributed Information Systems Laboratory

• University of Basel– Department Computer Science