I hate to sound pesemeistic, and may have missed somthing, but...<br><br>Do we have any gaurentee that this inacuracy isn't some messed up copy protection/obfucation/deliberate error/easter egg thing introduced by OS? I know they shouldn't have, but they are a relitivly clumsy organisation, and I'm sure there are people there that that don't like what's going on here, there are all sorts of ways that this could have happened.<br>
<br>Also, are we sure that we are using a completly accurate reprojection back form OS grid, with all of it's kinks and oddities?<br><br>JR<br><br><div class="gmail_quote">On 30 May 2010 23:32, James Hogan <span dir="ltr"><<a href="mailto:james@albanarts.com">james@albanarts.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div class="im">On Sunday 30 May 2010 12:16:33 Tim François wrote:<br>
> By the way, which method are people using to re-project the VectorDistrict<br>
> data? I'm using the inbuilt datum in gdal - is anyone using the correct<br>
> *.prj file, and is there a difference?<br>
<br>
</div>I'm using vectormap in Merkaartor from Git with the original prj files. I just<br>
tried in my area (york) with the modified prj file pointed to by Chris Hill<br>
and the difference is only around 30cm.<br>
<br>
The discrepancy between streetview tiles, vectormap and osm can be seen in<br>
this merkaartor screenshot:<br>
<a href="http://albanarts.com/%7Ejames/osm/pics/os_offsets_heworth.jpeg" target="_blank">http://albanarts.com/~james/osm/pics/os_offsets_heworth.jpeg</a><br>
<br>
I don't think the reprojection of the original streetview tiles is the issue,<br>
as the buildlings generated by TimSC's script from the original tiles are only<br>
offset from the reprojected tiles by about 3m to the west here.<br>
<br>
Cheers<br>
<font color="#888888">James<br>
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<br></blockquote></div><br>