gps leader™ in-vehicle data collection ben pierce by

GPS Leader™ In-vehicle Data Collection

www.gpsleader.com

Ben Pierce

By

Acknowledgementsfor

Ohio Department of TransportationData

Greg Giaimo Jesse Casas

Kentucky Traffic Model Users Group: Travel Survey Workshop

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


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


Battelle’s GPS Leader™

Main Unit:Integrated GPS,Data Storage, &

Power Management

Palm OSHandheld Device(User Interface)

GPS Antenna

Package Includes: Main unit Palm OS PDA GPS antenna Cables Software for

downloading and managing data

Documentation and video


Features of GPS Leader™

Time to fix <2 minutes cold start, <45 seconds warm start, <20 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


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


Household Travel Surveys: Entering User Supplied Data

Turn on vehicle, then PDA

Press ‘START’

Never need to enter data while vehicle is in motion


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


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


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


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

Lease Cost

Month Monthly Total

1 $350 $350

2 $300 $650

3 $250 $900

4 $250 $1,150

5 $200 $1,350

6 $200 $1,550

7 $150 $1,700


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

US 50 Travel Time Runs: Between Pershing Dr. and Waples Mill Rd.: Thur., Nov. 15, 2001

Start at 2:51 PM

Start at 3:37 PM

Start at 4:23 PM

Start at 5:16 PM

draft 12-11-01

Start at 2:16 PM

Start at 4:23 PM


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


Why GPS?


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


Ohio Results (cont.)Ratio of Average Diary Adjusted By GPS Vehicle and Person Trips per Household

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

2.6

1 2 3 4+ 1 2 3+ < $20k $20k -$39k

$40k-$59k

$60k> DK/RF

Rat

io

Vehicle: Diary Adj. by GPS vs. Diary

Person: Diary Adj. by GPS vs. Diary

No. HH VehiclesHH Size HH IncomeOverall


Ohio Results (cont.)

Percentage of Total Trips Not Reported Through Diary/Interviews

0%

2%

4%

6%

8%

10%

12%

14%

16%

18%

20%

1 2 3 4+ 1 2 3+ M T W R

Per

cen

tag

e o

f T

ota

l T

rip

s

Vehicle Trips Person Trips

Overall HH Size No. HH Vehicles TD Day of Week


Ohio Results (cont.)Distribution of "Found" Trips by Trip Characteristics

0%

10%

20%

30%

40%

50%

60%

70%

80%

ND D U D P U <5 5-10 >10 <5 5-10 10-30 >30

Per

cen

tag

e o

f F

ou

nd

Tri

ps

Vehicle Trips Person Trips

Trip Purpose Driver vs. Pass Distance (miles)

Duration (minutes)


Questions?

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