Re: Does a common travel/activity database structure exist? (was RE: Teaching real-world software skills to modelers)

From: 
"E Sall"
Reply to: 
"Main discussion list for the Travel Model Improvement Program." <TMIP-L@LISTSERV.TMIPONLINE.ORG>

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
, post about
version controlling and documenting the standard
]. We
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 wrote:

> 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]
> Facebook | Twitter > https://twitter.com/sandag> | YouTube > com/user/SANDAGREGION>
>
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