Enhancements #360
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Enhancements #360
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…ne are configured)
…ncluding all stops (not just those present in stop_times that have a departure time), but warning if some lack departure time and therefore yield in accurate frequency estimates. This can result in a larger denominator (including all stops, not just those with recorded departures) and consequently shift percentage estimates for pct_headway
…es when reporting gtfs results
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addresses #359
Importantly, this adds a new 'interpolate_stop_times' option for GTFS feeds to deal with the case of stop_times.txt missing departure times values. If that's the case, analysis of regular service frequencies cannot proceed accurately for that GTFS feed. As per the GTFS reference specification, missing departure or arrival times may be interpolated using the stop sequence start and end times within each trip id.
The new
interpolate_stop_timesoption/function if set fills null arrival and departure values using a linear interpolation according to the provided stop sequence start and end times within each trip_id. This is an approximation based on the available information, and results may still differ from the actual service frequencies at these stops. However, in the absence of further information, a user may judge it as an adequate approximation (using the values implicit in the data itself), in which case it would allow analysis to proceed.