[Talk-GB] Offsets between OS and OSM data (was Building with mapseg)

Steve Doerr steve.doerr at blueyonder.co.uk
Sun May 30 17:34:14 BST 2010


From: "Chris Hill" <osm at raggedred.net>
Sent: Sunday, May 30, 2010 11:53 AM

> I believe the StreetView tiles are offset south(ish) by a few metres in
> East Yorkshire too. Reprojected shape files line up well with surveyed
> data. I have traced a few buildings from StreetView but I've stopped
> until I had worked out what was wrong. Now given other people's comments
> I do think there may be some discrepancy.
>
> Would a few carefully surveyed road junctions with many GPS traces to
> work from help to identify any discrepancy? Or is there a better way?

Are the OS StreetView tiles based on OS grid squares? If so, the 
co-ordinates of the four corners of any tile must be known with very great 
precision. Wouldn't give a basis for verification?

-- 
Steve 






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