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1 Mobile Sensing: Leveraging Mobile Phones to Support Personal, Community, and Participatory Sensing Nithya Ramanathan Collaborating Faculty: Jeff Burke, Deborah Estrin, Mark Hansen, Mani Srivastava, Ruth West UCLA Center for Embedded Networked Sensing UCLA Center for Research in Engineering, Media and Performance Staff and Graduate Students: Faisal Alquaddoomi, Betta Dawson, Jeff Goldman, Eric Howard, August Joki, Donnie Kim, Vinayak Naik, Min Mun, Nicolai Petersen, Sasank Reddy, Jason Ryder, Vids Samanta, Katie Shilton, Nathan Yau UCLA Departments of Computer Science, Electrical Engineering, Statistics CENS Urban Sensing collaborators also include: Mark Allman, Dana Cuff, Jerry Kang, Vern Paxson, Fabian Wagmister, CENS Urban Sensing funding sources include: NSF CRI, NeTS-FIND, and OIA; Cisco, Nokia, Schematic, Sun, Walt Disney Imagineering R&D http://urban.cens.ucla.edu

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Mobile Sensing: Leveraging Mobile Phones to Support Personal, Community, and Participatory Sensing

Nithya Ramanathan

Collaborating Faculty: Jeff Burke, Deborah Estrin, Mark Hansen, Mani Srivastava, Ruth WestUCLA Center for Embedded Networked SensingUCLA Center for Research in Engineering, Media and Performance

Staff and Graduate Students: Faisal Alquaddoomi, Betta Dawson, Jeff Goldman, Eric Howard, August Joki, Donnie Kim, Vinayak Naik, Min Mun, Nicolai Petersen, Sasank Reddy, Jason Ryder, Vids Samanta, Katie Shilton, Nathan YauUCLA Departments of Computer Science, Electrical Engineering, StatisticsCENS Urban Sensing collaborators also include: Mark Allman, Dana Cuff, Jerry Kang, Vern Paxson, Fabian Wagmister, CENS Urban Sensing funding sources include: NSF CRI, NeTS-FIND, and OIA; Cisco, Nokia, Schematic, Sun, Walt Disney Imagineering R&D

http://urban.cens.ucla.edu

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Text Entry

Imagers Audio

Location (GPS)

Accelerometer

BluetoothNetwork Connectivity

What can one person do with this powerful tool?

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3Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

Presentation

PresentationVisualizationProcessingRaw Data

Can real-time feedback about our actions change our behavior?

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Mobile SensingGrassroots data collection

Scalable

Affordable

Believable

4Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

What can thousands of coordinated people do with this powerful tool?

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Mobile SensingGrassroots data collection

Scalable

Affordable

Believable

5Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

What can thousands of coordinated people do with this powerful tool?

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Mobile SensingGrassroots data collection

Scalable Affordable Believable

6Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

What can thousands of coordinated people do with this powerful tool?

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Data Campaigns

7Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

Phones enhance participationMake it.. Easier to collect more dataData is more credible and verifiable

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Data Campaigns

8Reddy, Samanta, Burke, Estrin, Hansen, Srivastava

Phones enhance participationMake it.. Easier to collect more dataData is more credible and verifiable

No Technological Innovation

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Image and activity data to study pollution exposure

http://www-ramanathan.ucsd.edu/ProjectSurya.html

Characterize Outdoor Activities

Infer Duration of Exposure

Collect Indoor Pollution Levels

Bluetooth temperature

sensor

Phone + GPS, accelerometer

Special soot filter

In collaboration with UCSD, SRU and TERI in India

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Active Image Collection for citizen science

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http://www.windows.ucar.edu/citizen_science/budburst

In collaboration with the ongoing citizen science initiative known as BudBurst

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Reflecting on and learning from personal mobility

Cyclesense combines location data and users’ photos to give bikers daily feedback and suggestions on the quality and safety of their commutes.

In PEIR, the combination of location, time, and activity are automatically interpreted using regional air quality models to estimate participants’ exposure to particulate matter.

http://peir.cens.ucla.edu/ http://urban.cens.ucla.edu/projects/cyclesense/

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Audio and location collection to recall family interactions

http://urban.cens.ucla.edu/projects/familydynamics/

http://www.kt.tu-cottbus.de/speech-analysis/

http://urban.cens.ucla.edu/projects/familydynamics/

In collaboration with the Semel Institute

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While off-the-shelf components can be used to implement data campaigns, there is still room for improvement….

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Protecting privacy while still collecting meaningful data

Example: Images of food contain compromising objects in the background

Ways to approach the problem

• Just don’t upload the sensitive data in the first place. Analysis on phone and partial sampling (FamilyDynamics)

• Give the user control over which data to release. Selective sharing (DietSense)

• Release the data, but add noise or obfuscate certain portions as needed. Location cloacking (PEIR)

• Only release aggregates of the data across some window in time or space Data aggregates (PEIR)

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Design to Maximize Trust and Participation

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Design Theme: Involve rather than burden the user by designing systems that are easy to use and understand.

Design Theme: Validate data.

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http://urban.cens.ucla.edu/

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PEIR Press Release

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Passive Image Collection for Diet Recall Studies

http://urban.cens.ucla.edu/projects/dietsense/

In collaboration with the public health department at UCLA

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Data Analysis and Using external data streams Example: Estimating Pollution without Pollution Sensors

Lifelong damage found in 13-year study of 3,600 Southland youngsters living within 500 yards of a highway. The Los Angeles Times, 1/26/07

Houston, Winer et al

Source: McConnell et al. Traffic, Susceptibility, and Childhood Asthma. Environ Health Perspect 114:766–772 (2006)

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Urban Sensing: Research Challenges

Scaling and credibility.Coordinated, opportunistic sampling.

Network attestation and verification of location, time, and other context.

Encouraging sharing.Data protection and selective, resolution-controlled dissemination.

Participatory privacy

Anonymous and pseudonymous participation. Reputation, incentive, and authoring frameworks.

Finding, visualizing, and analyzing data. Data stream naming, privacy-respecting discovery, and signal search.

Server-side signal processing for data processing, browsing, and auditing.

Spatial interfaces to data and authoring.

Infrastructure for capture, review, processing. Adaptive collection protocols.

Automatic feeding of data to models.

Privacy isn’t a separate concern...

it’s embedded in the sensing and research activities...

it has variable meaning in specific circumstances and settings...

it will skew participation and data collection