Collecting activity travel diary data state of the art and a hand held computer assisted solution
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Collecting activity-travel diary data : state of the art and a hand-held computer-assisted solution. Bruno Kochan, Tom Bellemans, Davy Janssens, Geert Wets Transportation Research Institute (IMOB) Hasselt University Belgium www.imob.uhasselt.be [email protected]

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Collecting activity travel diary data state of the art and a hand held computer assisted solution l.jpg

Collecting activity-travel diary data : state of the art and a hand-held computer-assisted solution

Bruno Kochan, Tom Bellemans, Davy Janssens, Geert Wets

Transportation Research Institute (IMOB)

Hasselt University

Belgium

[email protected]

Universiteit Hasselt, Campus Diepenbeek, Wetenschapspark 5 bus 6, BE-3590 Diepenbeek, Belgium


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Outline a hand-held computer-assisted solution

  • Introduction to Activity Based (AB) data

  • Data collection

  • Functional description of a new data collection tool

  • Conclusion


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Introduction a hand-held computer-assisted solution

  • 1950: - Rapid increase in need for transportation - Several Transportation models were used to predict travel demand

  • Four-step models: Travel = result of 4 subsequent decisions, modelled separately

  • Disadvantage of four-step models: No relationship travel <-> non-travel aspects

  • Solution: Activity-Based (AB) transportation models


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Introduction a hand-held computer-assisted solution

  • AB models predict interdependencies between several facets of activities

  • Facets:

- Which type of activity ?

- When ?

- For how long ?

- Conducted where ?

- Which transport mode ?

- With whom ?


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Data Collection a hand-held computer-assisted solution

Activity Based transportation models:

  • Data is collected by means of Activity-Travel diaries

  • Diary consists of a sequence of activities and journeys

  • Diary focuses on all the activities and journeys

  • Diaries:

Heavy demands on data collection system

- Take time to fill out

- A lot of activity facets


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Data Collection a hand-held computer-assisted solution

Paper-and-pencil

+

Pro:

  • Filled out any time and place

Con:

- Prone toerrors

- Consistency

- Complex

- Tedious


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Data Collection a hand-held computer-assisted solution

Computer aided self interview of activity-travel scheduling behaviour:

- CHASE (Doherty, 1997)

- VIRGIL (UHasselt, 2004)

Pro:

- User guidance

- Data quality

Con:

- Filled out at specific time

- Filled out at specific place

- Portability


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Data Quality a hand-held computer-assisted solution

Data quality:

- Activity: e.g. Begin time before end time

- Journey: e.g. Duration journey must equal sum trip durations

- Activity and Journey: No time gaps

- Activity and Journey: “Location continuity”


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Data Quality a hand-held computer-assisted solution

Activity 1

Activity 2

Location A

Location B

Journey 1

Start Location A

Start Location B


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Data Quality a hand-held computer-assisted solution

Activity 1

Activity 2

Location A

Location B

Journey 1

Start Location A

Start Location B


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Data Quality a hand-held computer-assisted solution

Activity 1

Activity 2

Location A

Location B

!

Journey 1

Start Location A

End Location C


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Data Quality a hand-held computer-assisted solution

Activity 1

Activity 2

Location A

Location B

Journey 1

Start Location A

End Location B


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Data Collection a hand-held computer-assisted solution

Computer-aided self interview of activity-travel scheduling behaviour:

- CHASE (Doherty, 1997)

- VIRGIL (UHasselt, 2004)

Pro:

- User guidance

- Data quality

Con:

- Filled out at specific time

- Filled out at specific place

- Portability


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Data Collection a hand-held computer-assisted solution

Internet-based self interview of activity-travel scheduling behaviour:

- iCHASE (Doherty, 1999)

- REACT (McNally, 1999- 2001)

Pro:

- Filled out at different places (e.g. work, home)

- Filled out at different times

- Portability


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Data Collection a hand-held computer-assisted solution

Personal Digital Assistant (PDA)

- EX-ACT (Rindsfüser, 2003)

Pro:

-Filled out at any place (e.g. work, home, bus)

-Filled out at any time

Con:

- Battery autonomy


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Data Collection a hand-held computer-assisted solution

GPS-enabled Personal Digital Assistant (PDA)

- Doherty, 2001

- IMOB, 2005

Pro:

- Respondent may forget to report journey

- Enables capturing route information

- Data can be used for checking consistency

Con:

- GPS not always reliable

- GPS accuracy (±30m)


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Disadvantages GPS a hand-held computer-assisted solution

  • GPS not always reliable:

- “Multipath”


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Disadvantages GPS a hand-held computer-assisted solution

  • GPS accuracy:

- Sattelites geometry


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Disadvantages GPS a hand-held computer-assisted solution

  • GPS accuracy:

- Time spent on measurement

- Start location

- End location


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Disadvantages GPS a hand-held computer-assisted solution

  • Autonomy:


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GUI a hand-held computer-assisted solutionHousehold Survey

GUI AB Survey

GPSLogger

GIS

Module

Data Integrity Checks

Trip Identification

Communication Module

Activity Diary& Household Data

GPSData

Functional description of a new data collection tool


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GUI a hand-held computer-assisted solutionHousehold Survey

GUI AB Survey

GPSLogger

GIS

Module

Data Integrity Checks

Trip Identification

Communication Module

Activity Diary& Household Data

GPSData

Functional description of a new data collection tool


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Functional description of a new data collection tool a hand-held computer-assisted solution


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Functional description of a new data collection tool a hand-held computer-assisted solution


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Functional description of a new data collection tool a hand-held computer-assisted solution


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Functional description of a new data collection tool a hand-held computer-assisted solution


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Functional description of a new data collection tool a hand-held computer-assisted solution

Activity attributes:

- Which type of activity ?

- When ?

- For how long ?

- Conducted where ?

- With whom ?


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Functional description of a new data collection tool a hand-held computer-assisted solution


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Conclusion a hand-held computer-assisted solution

  • Different approaches and technology for AB data collection

  • Data collection tool for a GPS enabled PDA


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