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

TinyNode GSM

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 Thur CCES/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 WLAN Infrastructure

• 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 Networks

Technische 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 Public

Metadata

============

Position

Sensor type

Validity 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 2010 Service 2009 Installation & 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