filtering unrealistic duration_minutes values from siri_rides

[idshklein]

Hi,
some of the values in siri_rides duration_minutes column are unrealistic, due to rides in which data was not transmitted in the beginning or end of trip.
In order to give the user an estimate about the quality of the ride duration, a it is possible to add a distance between the first location of the trip and the first stop of the trip, as well as for the last. This should return "circular" for circular lines.
I have done a "manual" version of this using the R code in the link:
https://gist.github.com/idshklein/a71baaf2118da8dae44c76d7cd2c87b1
adding those columns, using even haversine distance, could help filtering out wrong measurements.