Integrated Urban Models for Simulation of Transit and Land-Use Policies Final Report (1998) / Chapter Skim
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Appendix B
Appendix B
Pages 227-240
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From page 229... ...
Temporal dynamics are simulated by making "time steps" in general from time t to time t+ ~ as shown in Figure B.1. The land-use model provides activity distributions as inputs to the transport model in the same time period.
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From page 230... ...
Lopers space zoning: - L model I :; taxes/su~ space totals ~ and ) rli.ctnh~tic~n.~ a/ ..
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From page 231... ...
and employment totals by zone in categories consistent With the categories used as inputs to the transport mode} and thus related to the segmentation of mp purposes in the transport model. The travel costs are the zone to zone mode choice composite (dis~utilities (logit mode split logsum terms)
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From page 232... ...
respect relevant space capacities or (b) match space demand to space supply.
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From page 233... ...
TCRP H-12! Final Report Figure B.2 Anticipated Typical Classification of Activities and Space Types in the Land-Use Model and Corresponding Trip Purposes in the Transport Mode} Transport Flows Home-based Activity Categories Space Types / population/households residential to work R /allemployment to school ~ // Resources while-collar resources blue-collar ~s~ to shopping \//; \: Am/ // m anufactunng white -co liar \: Remanufacturing blue-collar to soc~al/recreat~onal I\ `\ in course ofwork /~ retail to personal business goods movement wholesale ~ If services education \ govemment/health - B-S industrial warehousing ~ / \\~ commercial office government institutional school
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From page 234... ...
Hain = activity of type "a allocated to zone ~ in iteration 'n' Baja = accessibility for activity of type a. in zone 'I' in time period 't-l' 0aj = term representing vector of other attributes of zone 'I' relevant to activity of type 'a' B-6
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From page 235... ...
Note that the superscript ;t-, representing time period 'I', has been omitted from terms for clarity.
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From page 236... ...
) where: ~n = TOSS of space of type 'A in zone 'I' though demolition Rfit = rent per unit of space of type 'L in zone 'I' in time period ;t' Cfit = cost to develop unit of space of type ~ plus taxes less subsidies in zone 'I' in time period 't.
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From page 237... ...
= total amount of space of type ;f allowable in zone 'I' in time period 't+l' according to zoning X1 to xo= parameters. Note that a multiplicative form is used, which means that if the available capacity (as indicated by the last term)
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From page 238... ...
in time penod 't+l allocates the exogenously-deterrnined model-area wide activity totals for time period ;t+l' according to the new space totals, Sfi2-i, along with the accessibilities B-10
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From page 239... ...
It should be noted Mat the simulation of space development through time is one of the primary areas where improvements are needed in both the state of the art and the state of the practice in and transport interaction modeling. Accordingly, a detailed treatment and a set of fairly flexible potential functions have been included for the developer model in this descnption of a prototype.
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From page 240... ...
TCRP H-19 Final Report B-12
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Key Terms
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