Multiple GTFS files

[rafapereirabr]

Hi Owen.

What would be the best way to proceed if I have three separate GTFS.zip files (one for each mode, including bus, subway and trains) and I would like to compute the travel time matrix considering potential boardings across transport modes. Any idea on this?

On a related topic, what happens if I do not specify -id [service id] ? In a fairly simple simulation I did (symmetrical travel time matrix of 5 points in Portland), I notice the algorithm still works without this input and there was not any difference in the results.csv.

[owenam]

Hi, Rafael! We have actually moved away from using that code and are now doing all of our travel time calculations using OpenTripPlanner. In terms of its GTFS processing, this tool is really quite primitive.

To answer your specific questions:

• The travel time calculator processes a single GTFS file at a time. To process multiple files you’d first need to merge them into a single GTFS file (and a single service ID).
• If no service ID is specified, I believe it defaults to the first service ID listed in calendar.txt, though I’d suggest checking the code to confirm.

Andrew Owen
Director — Accessibility Observatory (access.umn.edu http://access.umn.edu/)

On Sep 14, 2015, at 11:34 AM, Rafael Pereira [email protected] wrote:

Hi Owen.

What would be the best way to proceed if I have three separate GTFS.zip files (one for each mode, including bus, subway and trains) and I would like to compute the travel time matrix considering potential boardings across transport modes. Any idea on this?

On a related topic, what happens if I do not specify -id [service id] ? In a fairly simple simulation I did (symmetrical travel time matrix of 5 points in Portland), I notice the algorithm still works without this input and there was not any difference in the results.csv.

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[rafapereirabr]

Thank you for your answers Owen ! They are quite helpful.

Indeed, I had realized this tool has some important limitations (one of them being the simplistic approach it takes to account for pedestrian accessibility) and I'm glad to hear you are using a much improved algorithm. I haven't found a simple way to extract a travel time matrix using OpenTripPlanner, but I should look further into this.

cheers.