The shapes themselves aren’t particularly accurate, if you look at say building outlines and compare to Bing. It shouldn’t take long to find a non-rectangular building on Bing which has been approximated to rectangular in OS Open Map Local
Ed From: [email protected] [mailto:[email protected]] Sent: 06 June 2016 14:45 To: [email protected] Subject: [Talk-GB] OS open map local polygon accuracy Hi, I have been looking at the OS openmap local vector dataset. I noticed that the coordinates in there are centimetre level accuracy. I am speculating how the OS made this dataset a "nominal viewing scale" of 1:10000. Scales are somewhat irrelevant to vector data. Have they degraded the geometry points by thinning or averaging, or is the data still at survey level accuracy? I have some old (paid for) OS master map data. It would be interesting to compare the polygons in there with the the openmap local ones. But before I search my loft for the disc, has anyone already done this? Roger
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