activity-based modeling how does it work?. ct-ramp model coordinated travel – regional activity...
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Activity-Based Modeling
How does it work?
CT-RAMP model
Coordinated Travel – Regional Activity Based Modeling Platform (CT-RAMP) for the Atlanta Region
Basic Model Design and Linkage between Sub-Models
05/03/2013 2ABM: How?
Role of Population Synthesis(TMIP 5.8)
05/03/2013 ABM: How? 3
Where does population synthesis fit in? (TMIP 5.9)
05/03/2013 ABM: How? 4
Relations between activity model design elements
(TMIP 5.10)
05/03/2013 ABM: How? 5
Role of Person Types(TMIP 5.11)
05/03/2013 ABM: How? 6
Bridge Expansion Example(TMIP 5.12)
05/03/2013 ABM: How? 7
Relevance to Population Synthesizer(TMIP 5.13)
05/03/2013 ABM: How? 8
What does a synthetic pop. look like?(TMIP 5.14)
05/03/2013 ABM: How? 9
Steps in Creating a Synthetic Pop.(TMIP 5.15)
05/03/2013 ABM: How? 10
Pop. Synthesis – Summary View(TMIP 5.16)
05/03/2013 ABM: How? 11
Specifying a Target Distribution(TMIP 5.18)
05/03/2013 ABM: How? 12
Specifying Control Attributes (1)(TMP 5.21)
05/03/2013 ABM: How? 13
Specifying Control Attributes (2)(TMP 5.23)
05/03/2013 ABM: How? 14
Uncontrolled Attributes(TMIP 5.24)
05/03/2013 ABM: How? 15
Pop. Synthesis Process(TMIP 5.25)
05/03/2013 ABM: How? 16
Creating a Synthetic Population(TMIP 5.26, 5.33)
• Control the joint distribution of attributes in a synthetic population.
• Draw households from our sample to match multi-dimensional target distribution.
• Output a synthetic population consisting of all persons belonging to the households drawn.
05/03/2013 ABM: How? 17
Ex: Baltimore Metro Council(TMIP 5.45, 5.46)
05/03/2013 ABM: How? 18
Forecasting Future Synthetic Pops.(TMIP 5.57)
05/03/2013 ABM: How? 19
Accessibilities(TMIP 6.7)
05/03/2013 ABM: How? 20
Defining Accessibility(TMIP 6.9, 6.10)
05/03/2013 ABM: How? 21
Dimensions of Accessibility Variables(TMIP 6.15)
05/03/2013 ABM: How? 22
Area Type Stratification Variables(TMIP 6.23)
05/03/2013 ABM: How? 23
Activity Scheduling(TMIP 6.47)
05/03/2013 ABM: How? 24
Accessibility Effects: A Practical Ex.(TMIP 6.92)
05/03/2013 ABM: How? 25
Long-Term and Mobility Choice Models
(TMIP 7.7)
• Longer-term decisions such as buying a car and medium-term decisions such as whether to buy a transit pass or a toll transponder.
• They affect travel choices over the course of the year, as well as influencing travel choices on a day-to-day basis.
05/03/2013 ABM: How? 26
Bridge Expansion Mobility Effects(TMIP 7.11)
05/03/2013 ABM: How? 27
Summary of Mobility Model Decisions(TMIP 7.16)
05/03/2013 ABM: How? 28
Mobility Decisions w/in ____ Model(TMIP 7.18, 7.19, 7.20)
• Within day pattern models and as long-term choices, or represented in one or the other.
• Within the land-use model instead of the travel model.
• Within the population synthesizer. These might include auto ownership, driver’s licenses, or people who work at home. Most likely as uncontrolled population attributes.
05/03/2013 ABM: How? 29
Ex. of Hierarchical Choice of Workplace
(TMIP 7.38)
05/03/2013 ABM: How? 30
Long-Term & Mobility Decision Models in PSRC ABM System
(TMIP 7.49)
05/03/2013 ABM: How? 31
Challenges with New Policies and Technologies
(TMIP 7.56)
05/03/2013 ABM: How? 32
Activity Pattern Generation(TMIP 8.4)
• How individual travel choices are made on given (modeled) (week)day
• Individual daily activity pattern (DAP) is a central concept of activity based modelingo Replaces trip generationo Generates activities, tours, and trips with cross-
impacts on each othero Litmus test on understanding activity based
modeling
05/03/2013 ABM: How? 33
Activity Pattern & Tour Generation(TMIP 6.7)
05/03/2013 ABM: How? 34
Daily Activity Pattern(TMIP 8.7)
• A typology describing a combination of tours made by persons over the course of a day.
• Simple form: the number of tours of a particular purpose, such as “1 home-based work tour + 1 home-based social/recreational tour”.
• Or, use an over-arching description such as “mandatory” or “discretionary” or “stay home all day.”
05/03/2013 ABM: How? 35
Classification of Activities(TMIP 8.8)
05/03/2013 ABM: How? 36
Out-of-Home Activities / Travel Purposes (TMIP 8.10)
05/03/2013 ABM: How? 37
Why model trips for different purposes jointly? (TMIP 8.16)
05/03/2013 ABM: How? 38
Simplified IDAP Choice Ex.(TMIP 8.24)
05/03/2013 ABM: How? 39
Daily Activity Patterns(TMIP 8.25)
05/03/2013 ABM: How? 40
IAP Exact Number of Stops(TMIP 8.38)
05/03/2013 ABM: How? 41
Basic Choice Structure for Coordinated DAP (TMIP 8.48)
05/03/2013 ABM: How? 42
Coordinated DAP Type – 3 Persons(TMIP 8.49)
05/03/2013 ABM: How? 43
Types of Joint Travel (TMIP 8.66)
05/03/2013 ABM: How? 44
Scheduling and Time of Day Choice(TMIP 9.x)
05/03/2013 ABM: How? 45
ToD Choice in ABM System (TMIP 9.10)
05/03/2013 ABM: How? 46
Limitations of 4-Step w/rt ToD Choice(TMIP 9.12)
05/03/2013 ABM: How? 47
ToD Principal Modeling Approaches(TMIP 9.15)
05/03/2013 ABM: How? 48
Impacts on ToD Choice (TMIP 9.31)
05/03/2013 ABM: How? 49
Location & Accessibility Effects(TMIP 9.49)
05/03/2013 ABM: How? 50
Time Window Overlap (TMIP 9.54)
05/03/2013 ABM: How? 51
Summary: ToD Model Application(TMIP 9.82)
05/03/2013 ABM: How? 52
Forecasting, Performance Measures and Software (TMIP 12.3, 12.7)
05/03/2013 ABM: How? 53
Iterative Calibration (TMIP 12.11)
05/03/2013 ABM: How? 54
Equity Analysis (TMIP 12.19)
05/03/2013 ABM: How? 55
Bicycle and Walk Considerations(TMIP 12.25)
05/03/2013 ABM: How? 56
Scenario Testing (TMIP 12.26)
05/03/2013 ABM: How? 57
Parking Pricing Scenarios (TMIP 12.27)
05/03/2013 ABM: How? 58
Alternatives Analysis with ABMs(TMIP 12.33)
05/03/2013 ABM: How? 59
Stochastic Variation (TMIP 12.34)
05/03/2013 ABM: How? 60
Data Visualization Dashboard (TMIP 12.83)
05/03/2013 ABM: How? 61
Summary (TMIP 12.90)
• Requires new approaches to data collection, new skill sets, new hardware and software?
• Disaggregate representation of individuals provides summarization by any available attributes, enabling more sophisticated, higher-resolution analyses of transportation policy and investment alternatives.
05/03/2013 ABM: How? 62
-end-
Activity-Based Modeling
How does it work?
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