Deducing Mode and Deducing Mode and Purpose from GPS Data Purpose from GPS Data Peter Stopher, Jun Zhang Peter Stopher, Jun Zhang and Eoin Clifford and Eoin Clifford Institute of Transport and Institute of Transport and Logistics Studies Logistics Studies The University of Sydney The University of Sydney and Camden FitzGerald and Camden FitzGerald Parson Brinkerhoff, Sydney Parson Brinkerhoff, Sydney April 2007 April 2007
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Deducing Mode and Purpose from GPS Data Peter Stopher, Jun Zhang and Eoin Clifford Institute of Transport and Logistics Studies The University of Sydney.
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Deducing Mode and Purpose Deducing Mode and Purpose from GPS Datafrom GPS Data
Peter Stopher, Jun Zhang Peter Stopher, Jun Zhang and Eoin Cliffordand Eoin Clifford
Institute of Transport and Logistics Institute of Transport and Logistics StudiesStudies
The University of SydneyThe University of Sydneyand Camden FitzGeraldand Camden FitzGerald
Our surveys collect:Address of each workplace for each
household memberAddress of each educational
establishment attended by a household member
Two most frequently-used grocery storesHome address is known already
These locations are all then geocoded
April 2007 Deducing Mode and Purpose from GPS Data -- Case Studies
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Preliminary StepsPreliminary Steps
Assumes that the data have been subdivided into trips
We define a trip end as occurring whenever the device is stationary for more than 120 seconds
Visual inspection is also used to cross-check and correct some trip ends
About 5 percent of identified trip ends are just traffic stops
About 5 percent of actual trip ends are shorter than 120 seconds and not identified by software
Mode Identification
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Mode IdentificationMode Identification
Proceeds in a hierarchical process: Identify walk trips first – based on
maximum speed Identify rail, ferry, and other off-network
modes next – determined by location of path
Identify bus trips next – based on maximum speed and acceleration and beginning and ending on a bus route
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Mode IdentificationMode Identification
Identify bicycle trips next – household must have bicycles availableIf bicycle is available:
Check maximum speed and acceleration
Check that trip origin is home or is a location to which bicycle has already been used
If all of these are acceptable, then trip is allocated to bicycle
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Mode IdentificationMode Identification
Remaining trips should be carCheck maximum speed and accelerationCheck that travel remains on the roadway
network If these check out, then trip is car,
probably driverCheck to see if origin is home or car
was used previously to reach the origin If not, and car is still identified, classify
as car passenger
Trip Purpose
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Trip PurposeTrip Purpose
Examine trip end locations and check against frequently-used locations
Following purposes should be evident: Home-based work Home-based school Some home-based shop Non-home-based work Non-home-based school Non-home-based shop (some)
April 2007 Deducing Mode and Purpose from GPS Data -- Case Studies