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Oftentimes the same shape_id will be assigned to trips that follow the same "general" shape, but that are actually different.
Let's say for example that shape_id 1 goes from A, to B, to C and to D.
trip_id 1 describes a trip that goes from A to C, and trip_id 2 describes a trip that goes from B to D. In my opinion, these trips should be assigned to different shapes, even though they share the same "general" path.
In practice, GTFS from many different agencies will assign the same shape (shape_id 1) to the two different trips.
This issue can be fixed in two steps:
First identifying the shape_ids that are shared inadequately (in this case, let's say it would rename it to 1_1 and 1_2). disambiguate_shapes()
Then for each distinct shape, trim it to the first and the last stops associated to the trip it describes. trim_shapes()
trim_shapes() will behave weirdly if the shapes are not disambiguated first. In the aforementioned example, should it trim to A or B? So trim_shapes() MUST call disambiguate_shapes() first.
The text was updated successfully, but these errors were encountered:
Oftentimes the same shape_id will be assigned to trips that follow the same "general" shape, but that are actually different.
Let's say for example that shape_id 1 goes from A, to B, to C and to D.
trip_id 1 describes a trip that goes from A to C, and trip_id 2 describes a trip that goes from B to D. In my opinion, these trips should be assigned to different shapes, even though they share the same "general" path.
In practice, GTFS from many different agencies will assign the same shape (shape_id 1) to the two different trips.
This issue can be fixed in two steps:
disambiguate_shapes()
trim_shapes()
trim_shapes()
will behave weirdly if the shapes are not disambiguated first. In the aforementioned example, should it trim to A or B? Sotrim_shapes()
MUST calldisambiguate_shapes()
first.The text was updated successfully, but these errors were encountered: