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

[James Hogan]

On Sunday 30 May 2010 12:16:33 Tim François wrote:
> By the way, which method are people using to re-project the VectorDistrict
> data? I'm using the inbuilt datum in gdal - is anyone using the correct
> *.prj file, and is there a difference?

I'm using vectormap in Merkaartor from Git with the original prj files. I just 
tried in my area (york) with the modified prj file pointed to by Chris Hill 
and the difference is only around 30cm.

The discrepancy between streetview tiles, vectormap and osm can be seen in 
this merkaartor screenshot:
http://albanarts.com/~james/osm/pics/os_offsets_heworth.jpeg

I don't think the reprojection of the original streetview tiles is the issue, 
as the buildlings generated by TimSC's script from the original tiles are only 
offset from the reprojected tiles by about 3m to the west here.

Cheers
James
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