Tool to compare two GTFS feeds?

[rafeld...@gmail.com]

I need to compare two GTFS feeds from the same agency to see if there are changes in a route's stops and/or stop times. I've done some searching in this group and on the net, but I have not found a tool to do that. Does anyone know of such a tool?

 

Thanks,

Bob Feldman

[Aaron Antrim]

There is great need for more in the way of "GTFS-diff" tools.

Here is a previous discussion on transit-developers:

https://groups.google.com/d/topic/transit-developers/uUpAwB1A6jY/discussion

One idea would be to use something like gtfsdb to load into a postgres database, and then use a database comparison tool:

http://dba.stackexchange.com/questions/66662/compare-two-similar-postgres-databases-for-differences

Some time ago, github announced they were building diff tools for various geospatial data types:

https://github.com/blog/1772-diffable-more-customizable-maps

Not sure if anything more has come of that.

-- 
Aaron Antrim
Trillium Solutions, Inc.
www.trilliumtransit.com
Portland, Oregon

[James Bunch]

It has been 6 years since this query.  Does anyone know of any tools that have been developed to compare feeds from the same agency as they change over time?  We have to track service changes in a corridor over a three year period for an  FTA Tiger Grant evaluation.  Stop locations are easy.   Patterns and trips are much much harder when they get renumbered with each new GTFS Feed, or branching changes.

JAB

[Joachim Pfeiffer]

Although the Transit Developers group isn't very active these days, it might be worth a shot to post this there. I am sure if there's funding, there will be takers. A few small consultancies I can think of that might be interested and qualified:

Citydata AI, Citidash AI, Interline IO, PEMCCO (minority owned), Remix, Streetlightdata, Swift.ly, TransTrack Solutions, Trillium Solutions, Urbanmovement Labs, Urbanmobility, Ubicquia

JP

On Tue, Feb 16, 2021 at 5:13 PM James Bunch <jabunc...@gmail.com> wrote:

Not sure if my previous message posted.  It's been 6 years since this query on how to compare GTFS feeds.  Has anything been developed in this period?  We need to track changes in service over 3 years for a FTA Tiger Grant before/after evaluation.

Jim Bunch

On Saturday, March 28, 2015 at 10:41:17 PM UTC-4 Aaron Antrim wrote:

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[Devin Braun]

Our vendor, Mecatran, has a tool in their software suite that does a DIFF between two feeds. 

 

Devin Braun

San Diego MTS

 

From: googletran...@googlegroups.com <googletran...@googlegroups.com> On Behalf Of Joachim Pfeiffer
Sent: Wednesday, February 17, 2021 7:30
To: googletran...@googlegroups.com
Subject: Re: Tool to compare two GTFS feeds?

 

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[James Bunch]

I don't think there is funding for software development for this project.  It is an ongoing contract with limited scope.  However, I do believe that a comparison tool has widespread utility and application.

[James Bunch]

Thanks. I will look into this.

[Agraw Ali]

IBI Data Tools has a functionality to compare two GTFS datasets. https://gtfs.ibi-transit.com/

[James Bunch]

Thanks so much!  The project is over but we still have a need to do this all the time.

JAB

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James (Jim) Allday Bunch, JABunch Transportation Consulting

411 Penwood Road, Silver Spring Maryland, 20901 

240-271-3534 jabunc...@gmail.com