Howdy TMIPers,
As part of a three-agency effort to work on dynamic transit passenger
network models, we needed to put all of the AB model demand into a common
format and thus developed a standard that was suitable for three different
AB models called *dyno-demand*.
You can read about the standard [ which is in active development ] and
reference it at its home on the web:
http://github.com/osplanning-data-standards/dyno-demand and have written
about it in our project blog [ post about developing data standards
version controlling and documenting the standard
welcome feedback using the blog comment feature or the GitHub issues
tracker functionality and would curious about how compatible it is with
other specifications.
Cheers!
-Elizabeth
On Tue, Sep 13, 2016 at 8:29 AM, Sun, Wu
> A travel model database typically stores population, demand trip lists
> (tables), impedances, assignment results, and network data. Many core data
> in each of these components are common to various flavors of ABM. We have
> been talking about a common modeling framework, maybe it is about time to
> talk about a common travel model database. The issue, like a common
> modeling framework, is to design a system flexible and modular enough to
> allow customizations.
>
> Wu Sun, Ph.D
> Senior Transportation Modeler
>
> SANDAG
> (619) 699-5757
> 401 B Street, Suite 800, San Diego, CA 92101
>
> -----Original Message-----
> From: Main discussion list for the Travel Model Improvement Program.
> [mailto:TMIP-L@LISTSERV.TMIPONLINE.ORG] On Behalf Of Scott Ramming
> Sent: Monday, September 12, 2016 5:05 PM
> To: TMIP-L@LISTSERV.TMIPONLINE.ORG
> Subject: Does a common travel/activity database structure exist? (was RE:
> Teaching real-world software skills to modelers)
>
> Clint's comment on the "tailored SANDAG database structure" makes me
> wonder what structures various activity-based models -- or even household
> travel diary surveys -- might have in common.
>
> For instance, most ABMs synthesize persons, who generally live in
> households. (Does someone know of an ABM that simulates say the general
> quarters population, or a visitor population?)
>
> Some regions may choose to model vehicles, particularly if they're
> concerned about air quality issues that may result from vehicle assignment:
> Does the long-distance work commuter get the SUV or the EV?
>
> Persons make tours during the day, which are generally defined to be
> home-to-home. Our DOT partner is concerned with longer-distance travel, and
> thus reminds us (since we intend to share model application software) that
> they need to consider "open" tours, that is, external-to-home,
> home-to-external, and external-to-external. Our ABM considers work-based
> subtours, which look every bit like a tour, except for beginning and ending
> at work rather than home. I suppose there may be other ABMs that consider
> school-based subtours.
>
> Tours are composed of trips, which connect activities as stops or trip
> ends, depending on your preferred terminology. Tours might be divided into
> an outbound and inbound half tour before and after the tour primary
> destination.
>
> Linked transit trips might consist of legs or segments between boardings,
> plus access and egress.
>
> It seems like with sufficient abstraction, these relationships don't
> necessarily have to be region- or model-specific.
>
>
> M. Scott Ramming, PhD, PE | Senior Travel Modeler | Transportation
> Planning & Operations Direct 303-480-6711 | Fax 303-480-6790 | E-mail
> sramming@drcog.org
>
>
> 1290 Broadway . Suite 100 . Denver, Colorado 80203-5606
> main: 303-455-1000 . email: drcog@drcog.org . web: www.drcog.org
>
>
>
> Get the inside news on health for older Coloradans
>
>
>
>
>
> -----Original Message-----
> From: Main discussion list for the Travel Model Improvement Program.
> [mailto:TMIP-L@LISTSERV.TMIPONLINE.ORG] On Behalf Of Daniels, Clint
> Sent: Friday, September 09, 2016 10:08 AM
> To: TMIP-L@LISTSERV.TMIPONLINE.ORG
> Subject: Re: Teaching real-world software skills to modelers
>
> Our trainings at SANDAG were specifically tailored to SANDAG database
> structure. I could send the final queries, but I'm not sure how useful that
> may be.
>
> If your still interested, I'm happy to share. Just shoot me a private note
> or give me a call to discuss.
>
> Clint Daniels
> Principal Research Analyst
>
> SANDAG
> (619) 699-1960
> 401 B Street, Suite 800, San Diego, CA 92101
>
> [cid:image001.png@01D1D781.5D694C70]
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