On Wed, May 7, 2014 at 1:47 PM, Ismail, Mark <[email protected]>wrote:
> I am using BING aerial as a base map and trying to move the map to a
> coordinate and add a marker
>
>
>
> The search system I am using stores its coordinates in EPSG:27700 , I am
> re projecting using proj4s to EPSG:900913
>
>
>
> The map is in roughly the right area but is 50 mteres or so out
>
>
>
> Any idea why ?
>
Might be due to wrong datum shifts params, or lack of a grid based
transformation (ntv2 and the like)
to make a precise datum shift.
If you are using proj4s to do the transformations, you should probably ask
on their mailing list (if they have any)
Cheers
Andrea
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