[Talk-GB] OS open map local polygon accuracy

[Ed Loach]

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: roger at beardandsandals.co.uk [mailto:roger at beardandsandals.co.uk] 
Sent: 06 June 2016 14:45
To: talk-gb at openstreetmap.org
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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