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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