Algorithm for generating isochrone map

[Shenyuan Bao]

Hi all,

I have been trying to figure out how OTP generate the isochrone map recently for the purpose of finish my graduate research project. I tried to google to find the relevant documents, but unfortunately, most of them are unavailable already. 

I wonder if there is anyone who knows about it or keeps some of the documents to read? Any help will be highly appreciated.

Thanks,

Shenyuan

[Laurent Grégoire]

Hi Shenyuan,

You can find some details on the opentripplanner-dev mailing list, this is rather old but contains some details / explanation on my initial isochrone implementation. In historical order:

https://groups.google.com/g/opentripplanner-dev/c/ZcprBhpXAuE/m/Hns8jqMsKAEJ

https://groups.google.com/g/opentripplanner-dev/c/yYN2oHU3dS8/m/lfBzbZkmQMAJ

https://groups.google.com/g/opentripplanner-dev/c/Gwbu2x-B7Jo/m/cOjMDWdpd3YJ

You may find of course more information by digging into the mailing list, relevant keywords are "isochrone" and "analyst". AFAIK there is no really any "documentation" on the implementation details (usually OTP documentation only covers usage, API and algorithms; more detailed documentation about the code / implementation is in the code itself as comments).

Beware that:

- We are talking of some old and deprecated code (AFAIK OTP2 do not support analyst / isochrone anymore)

- You can find more details by digging into the code.

HTH,

--Laurent