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r-transit / tidytransit

R package for working with GTFS data
https://r-transit.github.io/tidytransit/
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Bundle pfaelde for map matching of routes #156

Open mpadge opened 4 years ago

mpadge commented 4 years ago

---Just an idea--- The excellent pfaedle library uses OSM input to do precise map-matching between GTFS stops. It's GPL-3 licenced, so could be bundled here without infringement.

what it would do

shape tables don't exist for all feeds, and even where they do, are often just made from straight lines between stops. pfaedle library fills in all the gaps, and gives you very precise shape tables.

why here?

This functionality would be really cool, and tidytransit seems like a better home than gtfsrouter.

other thoughts

I'd be happy to help if you were interested, although most likely to rapidly progress if somebody else could chip in with the C++ skills, because I'm not sure I'd have so much time to offer. Let me know what you think, and we could maybe at least s-l-o-w-l-y get going ...

ping @AlexandraKapp: would you be interested in this kind of functionality?

polettif commented 4 years ago

That's a great idea. I've been using pfaedle in other workflows and it's really quite nifty. However, I don't have any C++ or Rcpp skills, so any help would be greatly appreciated.

Maybe a function interface to a pfaedle's command line calls (or something like that) whitout bundling it with tidytransit could be a first step.

mpadge commented 4 years ago

Maybe a function interface to a pfaedle's command line calls (or something like that) whitout bundling it with tidytransit could be a first step.

That would be quite difficult to get that on CRAN, because you'd need to automate the system install for all checks anyway, which wouldn't be much less difficult that just bundling. I'll definitely try to find time to do it soon-ish - feel free to ping me anytime if you think i might be taking too long.

polettif commented 4 years ago

That would be quite difficult to get that on CRAN, because you'd need to automate the system install for all checks anyway, which wouldn't be much less difficult that just bundling.

Ah, just don't include it in the tests ;) Nah that's a good point. Plus, pfaedle's not in rapid development anymore anyways so bundling's fine.

I'll definitely try to find time to do it soon-ish - feel free to ping me anytime if you think i might be taking too long.

Thanks! I'll keep this earmarked.

AlexandraKapp commented 4 years ago

ping @AlexandraKapp: would you be interested in this kind of functionality?

Sounds like a great idea! Generally this could be interesting for us, but probably not the most importpant currently.