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 _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
