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Re: [onebusaway-developers] stop_times.txt::shape_dist_traveled and shapes.txt::shape_dist_traveled


Brian Ferris Mar 16, 2012 12:15 PM
Posted in group: onebusaway-developers
Indeed.  I checked the code.  We're not using these values at all on import.


On Fri, Mar 16, 2012 at 7:31 PM, Frumin, Michael <mfr...@mtahq.org> wrote:
> Brian, thanks.
>
> Should I take your response on the transit-developers list to indicate that in fact OBA ignores these entirely, or at least sufficiently so as to not affect anything we are doing?
>
> Thanks,
> Mike
>
>
> -----Original Message-----
> From: onebusaway...@googlegroups.com [mailto:onebusaway...@googlegroups.com] On Behalf Of Brian Ferris
> Sent: Thursday, March 15, 2012 12:19 PM
> To: onebusaway...@googlegroups.com
> Subject: Re: [onebusaway-developers] stop_times.txt::shape_dist_traveled and shapes.txt::shape_dist_traveled
>
> I'm pretty sure OBA ignores both shape_dist_traveled fields, even when
> specified, because there is no guarantee from the spec about what
> units will be used for these values (we use meters internally) and we
> generally trust ourselves to compute these values just as accurately
> if not more so than the GTFS providers.  I will check the code later
> tonight to confirm.
>
> Brian
>
>
> On Thu, Mar 15, 2012 at 3:44 PM, Frumin, Michael <mfr...@mtahq.org> wrote:
>> Brian,
>>
>>
>>
>> Currently our GTFS has neither stop_times.txt::shape_dist_traveled nor
>> shapes.txt::shape_dist_traveled so OBA calculates both itself, apparently
>> correctly in every case I've looked at.
>>
>>
>>
>> I'm considering trying to add these fields, but I want to know how much risk
>> this will create around how OBA digests and uses our GTFS.  Does OBA even
>> use these fields *if* they are there, or does it always re-calculate them
>> for itself?
>>
>>
>>
>> My concern is that if we messed it up at first, we might be breaking
>> something that's not currently broken.
>>
>>
>>
>> Thanks,
>>
>> Mike
>>
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