[Talk-GB] Ordnance Survey

Richard Fairhurst richard at systemeD.net
Fri Apr 2 12:55:12 BST 2010


Tim Francois wrote:
> Ah, I see - I've been following the mailing list but must have missed that
> memo. No problem, I'll hold fire! :)
>
> (Out of interest, how is an image tile reprojected? Any good references I
> could read? Just curious...)

A wonderful suite of programs called gdal is your friend. :)

The process is pretty much:
1. read StreetView tile
2. add a bit of border from the surrounding tiles
3. reproject using gdalwarp
4. slice into 900913 tiles and save them
5. repeat over entire dataset

It's exactly the same as we've done with the out-of-copyright maps, but 
with the helpful addition that we don't have to faff rectifying them first.

cheers
Richard




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