On 22 October 2012 14:23, Andy Robinson <ajrli...@gmail.com> wrote: > From: Ben Pollinger [mailto:benpollinger+...@gmail.com] wrote: >> Sent: 22 October 2012 13:12 >> To: talk-gb@openstreetmap.org >> Subject: Re: [Talk-GB] Lake District Satellite Imagery >> >> Hello all, >> >> I never use the highest zoom level Bing imagery as it's rarely sharp > enough to >> be useful. I have found Bing to give better resolution and alignment than > OS >> OpenData StreetView (OSSV) in most places I work on (mostly West >> Yorkshire). >> >> Bing also tends to agree more precisely with the NaPTAN imported bus stops >> on my 'patch'. If I trace the centre of a road on Bing, any bus stops will > be >> equal distances from that trace, i.e. where the actual stops are. I'm not > sure >> how the locations of stops are measured in NaPTAN but I guess they would >> be measured more accurately than consumer GPS or aerial survey. >> > Ha, I wish! In Birmingham stops can be anything up to 200m from their actual > location. They are very rarely closer than 10m to the right spot and were > clearly not derived using modern surveying methods. The variability of stop > position between regions is a clear indication that each authority > contributed wildly differing data quality. It's one of the reasons I > understand that DfT were happy for OSM to have the data. Ie they would get > to see the location improvements with time. > > Cheers > Andy >
I see, forgive my assumption then! I will consider myself lucky. Bing and NaPTAN generally agree very well around West Yorkshire, and (importantly) match to the foot and drive-by surveys I have done over the years too. cheers, Ben _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
