GPS Leader Invehicle Data Collection www'gpsleader'com

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GPS Leader In-vehicle Data Collectionwww.gpslea
der.com
By

• Ben Pierce

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AcknowledgementsforOhio Department of
TransportationData
Greg Giaimo
Jesse Casas
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Presentation Outline

• Battelle and GPS
• Technical Review of GPS Leader
• Uses of GPS Leader
• Equipment Costs
• An Illustrative Example Results from a Recent
  Study in Ohio

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Battelle and GPS

• Battelle conducted one of the first GPS studies,
  as a trial case on behalf of FHWA, in Lexington,
  Kentucky in 1996-1997.
• Current GPS Leader equipment was developed by
  Battelle as a result of this trial
• To date, have collected GPS data from 700 homes
  using GPS Leader equipment

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Battelles GPS Leader

• Package Includes
• Main unit
• Palm OS PDA
• GPS antenna
• Cables
• Software for downloading and managing data
• Documentation and video

Main Unit Integrated GPS, Data Storage, Power
Management
Palm OS Handheld Device (User Interface)
GPS Antenna
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Features of GPS Leader

• Time to fix lt2 minutes cold start, lt45 seconds
  warm start, lt20 seconds hot start
• Data collected (every second or less often)
• Via the GPS receiver
• vehicle location in latitude longitude
• travel speed
• Via the handheld user interface
• driver/occupants and trip purpose data
• intersection or delay data
• 12 MB on-board memory, stores 5 to 7 days of
  detailed trip data for later download
• Approximately 70 hours at the one-second level

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Using GPS Leader for Household Travel Surveys

• Can be used to actively (via PDA) or passively
  (via ignition sensing) to collect trip
  information (or a combination of both)
• Battelle has mostly used a combination of active
  and passive trip detection

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Household Travel Surveys Entering User
Supplied Data

• Turn on vehicle, then PDA
• Press START
• Never need to enter data while vehicle is in
  motion

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Household Travel Surveys Entering Data

• Select driver from pre-populated list
• Select any passengers, if any, from
  pre-populated list
• Stow PDA and begin driving

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Household Travel Surveys Entering Data (cont.)

• Stop vehicle and select END TRIP
• Select trip purpose for each occupant (will vary
  for each survey)
• Indicate whether you are at your final
  destination or an intermediate stop

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Household Travel Surveys Entering Data (cont.)

• For intermediate stops, indicate
• whether
• there is a change in driver
• you picked up a passenger
• you dropped off a passenger
• Otherwise, device is ready for next trip

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Equipment Costs

• Purchase Price 1,650
• GPS data collection and storage unit
• GPS receiver
• Handspring Visor PDA
• PDA user data collection software
• Data and power cables
• GPS Leader Data Management Software
• User documentation
• Lease Program
• Fee-for-Service option

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Uses of GPS Leader Other Than Household Travel
Surveys

• Travel Time Studies
• Vehicle Activity Surveys (e.g., Commercial Truck
  Surveys)
• Emission Modeling and Duty Cycle Studies
  
• Fleet Performance / Operations Analysis

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Ohio Results Methods

• Used Combination of active and passive data
  collection (i.e., automatic trip detection and
  collection of trip information from user)
• GPS self-installed/uninstalled by respondent
• Diary retrieval was a separate process from GPS

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Why GPS?
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Ohio Results

• On average, participants of the GPS study
  reported 1.3 1.6 times more person and vehicle
  trips during their diary interviews than did the
  main survey participants
• Overall, there were roughly 8 percent of trips
  that were identified by GPS but were not reported
  in the diary

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Ohio Results (cont.)
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Ohio Results (cont.)
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Ohio Results (cont.)
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Questions?