[OSM-talk] NaPTAN bus stop import

[Shaun McDonald]

You'll find that this has been talked about on the talk-gb and the  
talk-transit mailing lists as they are not of global importance,  
rather just nation UK importance.

Shaun

On 21 Sep 2009, at 10:06, Mike Harris wrote:

> Hi
>
> Can someone expand a little on what is happening with the NaPTAN bus  
> stop import apparently ongoing in some UK areas? I have taken a look  
> at the wiki but am still a little unsure about a couple of things  
> and don't want to cause any problems with what appears to be a  
> potentially valuable addition to OSM. Pity it wasn't announced on  
> this talk group?
>
> 1. What are the basic import and rendering rules? Bus stops seem to  
> appear in various places - all as a relation with two members but  
> rendered variously  (but different from the usual bus stop  
> rendering, least in JOSM, my main editor), sometimes only one is  
> rendered, creating the risk that one tag of the pair gets  
> accidentally deleted as an orphan node.
>
> 2. If the two members of the relation are supposed to be two stops  
> either side of the road, how does NaPTAN handle where there is  
> physically only one - i.e. one stop on one side of the road is for  
> both directions? Is this the reason for the un-rendered nodes?
>
> 3. Where a bus stop has already been manually added prior to the  
> import do we just leave well alone at the moment until the merge  
> process is more advanced? i.e. there will be 3 or 4 bus stops where  
> there should be one or two. Messy - but I can understand the need  
> for consistency in the longer run.
>
> 4. The positioning of the NaPTAN-imported bus stops seems generally  
> to be very good vis-à-vis GPS surveyed manually entered bus stops  
> (at least the ones I've stumbled across so far) - but where there is  
> a discrepancy are we allowed to correct yet or not? The bigger issue  
> seems to be where there is only a NaPTAN import but it is out of  
> line with the relevant way - this seems to be much more common in my  
> limited experience. I suspect that the ways may be off (e.g. created  
> from NPE or Yahoo tracing - or simply surveyed at speed from a bike  
> or even a car - which I find significantly less accurate than  
> walking surveys). But I am reluctant to move ways unless I have a  
> GPS survey in which I have confidence (e.g. I know the data point  
> recording frequency and the reported error re the satellite  
> reception).
>
> Sorry to ask so many questions but like all innovations - and this  
> one seems potentially very powerful - there are bound to be teething  
> troubles and while I don't want to meddle unnecessarily there are a  
> few issues arising.
>
> Cheers - and congratulations to those ho have facilitated this import.
>
> Mike Harris
>
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