[Talk-transit] NaPTAN data import in Birmingham update

[Roger Slevin]

Brian

 

I would be very interested to have the evidence about the transposed stops
if that is possible.  Thanks.

 

Do you not have access to "bearing" - it's in the source data, but I am not
sure what you have access to.  I can certainly let you have a file with the
bearing data in it, if you do not have access to this from anywhere else.

 

CUS is a fact of life - nothing I can offer in response to that.

 

If stops have been removed - but not removed or replaced in NaPTAN - then I
would again like evidence to take back to colleagues who maintain NaPTAN.
It is possible that they have changed the stop sub-type from MKD to HAR -
that is the preferred method of handling this situation in NaPTAN.   A
formal HAR record has an entry point, what I call an "anchor" point in the
middle, and an exit point.  The guidance tells editors that these should all
fall on the same named road (but in practice we know that a lot of them do
not adhere to this rule).  What is almost certainly the case in almost every
case is that the length of the HAR section is not the same as the full
length of the road ... most well-created HAR records would have entry and
exit points which are at least a few metres short of the road junctions at
each end.

 

Best wishes

 

Roger

 

From: talk-transit-bounces at openstreetmap.org
[mailto:talk-transit-bounces at openstreetmap.org] On Behalf Of Brian Prangle
Sent: 26 May 2009 17:19
To: talk-transit at openstreetmap.org
Subject: [Talk-transit] NaPTAN data import in Birmingham update

 

Having surveyed (and resurveyed) about three hundred bus stops I think I
could draft (soon)  a definitive report on how to proceed. 

There's also a few points to emerge about the Birmingham data

1. I'm coming across regular transpositon of stops from opposite sides of
the road ( would be useful to have bearing data)
2. Not having the CUS marker on customary stops makes for hard work
surveying and editing on estates where practically every other stop is CUS
3. Came across two routes (36 and 36C) where whole roads have had their bus
stops physically removed (still showing as NaPTAN data) and the timetables
show the roads as Hail and Ride zones. Couple of things here - I presume
that actual practice has gone beyond the capacity of NapTAN data to keep
pace ( I'll add the details to the NaPTAN error log on the mappamercia wiki
shortly) and how do we import the HAR data - or represent it ( I can't
remember  where our previous discussions got to). In the meantime I'll
probably just tag the roads as HAR=yes and HAR_route_ref= xx.  (Without the
timetable there's nothing visible on the ground to indicate to surveyors
that they are in a HAR zone)

Note for Thomas - I know you're into exam season - none of this is desperate
- there's a few thousand more bus stops to survey and verify yet!

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