I've just done a quick render of what was extracted from the West Mids data set - http://dev.openstreetmap.org/~edgemaster/naptan/
2009/4/1 Roger Slevin <ro...@slevin.plus.com>: > Thomas > > Ok - thanks. I will get a close approximation to this by using current data > with the same filtering criterion - and hopefully, if there are further > questions about any specific aspects of the data, I will be able to respond > to them. > > Roger > > -----Original Message----- > From: Thomas Wood [mailto:grand.edgemas...@gmail.com] > Sent: 01 April 2009 18:15 > To: ro...@slevin.plus.com > Cc: Brian Prangle; Talk-gb-westmidlands@openstreetmap.org; > talk-tran...@openstreetmap.org > Subject: Re: [Talk-transit] NaPTAN bus stop database import - some > moreobservations > > 2009/4/1 Roger Slevin <ro...@slevin.plus.com>: >> I would be able to comment more about the missing data and other aspect >> which you and others draw to the list’s attention if I could have a copy > of >> the NaPTAN data that has been put through the import process – can you (or >> someone else on the list) either point me to where I can find that > specific >> data set … or can send me a copy of the specific data that has been >> imported? >> > > Currently all data as of 25th March 2009 19:47:46 in the West Midlands > region with the a value of Birmingham (case insensitive) in the Town > field. > > I am planning to check to see if we missed any stops, and add any > missed based upon a bbox matching. > >> >> Best wishes >> >> Roger >> >> ________________________________ >> >> From: talk-transit-boun...@openstreetmap.org >> [mailto:talk-transit-boun...@openstreetmap.org] On Behalf Of Brian Prangle >> Sent: 01 April 2009 13:41 >> To: Talk-gb-westmidlands@openstreetmap.org; talk-tran...@openstreetmap.org >> Subject: [Talk-transit] NaPTAN bus stop database import - some >> moreobservations >> >> >> >> Some more views and observations on the NaPTAN data import in Birmingham: >> >> 1. It serves as a great QA on OSM data and shows that in the City >> Centre where we have not been able to get decent GPS traces more accuracy > is >> needed so the potential of obtaining aerial photography is great. >> >> 2. It’s a great impetus to resurvey streets where earlier work >> (potentially inaccurate from NPE tracing, older GPS devices, less points >> collected, inexperience, not realising that roads have a width greater > than >> the rendered line so placing bus stops too close to the road etc.) can be >> improved. >> >> 3. It’s also a great impetus to improve practice on surveying bus >> stops and be much more precise and comprehensive – also a stimulus to edit >> all those old bus stops where we placed them as a node on the way rather >> than to the side of ways which is our current practice. >> >> 4. QA works both ways and our surveys should help to improve NaPTAN >> data. >> >> 5. As an exercise(excuse the pun!) I cycled from Acocks Green to >> Moseley and back this morning along the No 1 bus route and surveyed 47 bus >> stops each time standing at the pole(leaning against it – you can’t get >> closer than that!) or underneath the plate at a shelter: 4 bus stops >> coincided within 3-4 m; 17 were “good enough” coinciding <8-10m. That’s >> approx 45%. The rest were out by anything up to 90m or were just missing. >> >> 6. I think either the pole where there is no shelter or the bus stop >> plate at a shelter should be what we survey – that’s where the >> identification of what we survey is located >> >> 7. Where a physical stop on one side of the road doubles up for one > on >> the other side also – I think we’re OK by surveying and tagging the > physical >> one with Andy’s suggestion of a tag opposite=yes. The NaPTAN untagged node >> on the other side can be left in place to indicate the logical >> relationship. >> >> 8. I like the idea of tagging where the bus stop is set back in a >> “lay-by” from the road which might account for some NaPTAN nodes being > some >> distance from the road >> >> 9. For our purposes “good enough” is probably sufficient rather than >> precise positional detail – I’m of the view that as long the bus stop has >> more or less the right relationships to its surroundings then that’s OK. >> >> 10. Surprised that there is no data for either the closed Digbeth Coach >> Station which is being rebuilt or the temporary replacement nearby. I >> thought we were importing off-street bus stops? Perhaps the NaPTAN data >> doesn’t exist? >> >> 11. Can’t find any nodes for taxi ranks – not imported or doesn’t exist >> for Birmingham or I’m not looking hard enough? >> >> 12. For the few nodes where I’ve estimated the fit between OSM and > NaPTAN >> to be “good enough” I’ve merged the nodes deleting the unverified tag and >> editing source tag to v=naptan_import;survey >> >> 13. Verifying the data is going to be a long, slow process with a lot of >> resurveying needed. >> >> _______________________________________________ >> Talk-transit mailing list >> talk-tran...@openstreetmap.org >> http://lists.openstreetmap.org/listinfo/talk-transit >> >> > > > > -- > Regards, > Thomas Wood > (Edgemaster) > > > -- Regards, Thomas Wood (Edgemaster) _______________________________________________ Talk-gb-westmidlands mailing list Talk-gb-westmidlands@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb-westmidlands
