Estimate frequency of fastest connections

UrbanAnalyst / m4ra

many-to-many multi-modal routing aggregator

https://urbananalyst.github.io/m4ra/

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Estimate frequency of fastest connections #17

Closed mpadge closed 1 year ago

mpadge commented 1 year ago

Current ˋm4ra::m4ra_times_multi_modeˋ function returns single fastest time in specified internal. This should be extended to run just the GTFS part starting at just after the fastest service, and returning the time internal between the two as an indicator of service frequency.

mpadge commented 1 year ago

That commit adds most of the functionality. It just needs to be switched on by:

[x] Exposing an extra binary parameter in m4ra_gtfs_traveltimes() to determine whether or not to do these extra calculations.
[x] When that is selected, add one line to call the gtfs_next_intervals() function.

And that should do it.

mpadge commented 1 year ago

Note that the above commit resolves the issue of some trip intervals being negative. Those are actually not a bug, but reflect instances where exclusion of initial trips leads to routing on subsequent trips which leave earlier overall, yet involve more transfers so are not picked up in the initial scan.

mpadge commented 1 year ago

Re-opening to incorporate the output of the GTFS function, which is part of the pre-calcualtion routines, into the output of the main multi-modal travel times functions.