[Talk-GB] Ordnance Survey

Tim François sk1ppy14 at yahoo.co.uk
Fri Apr 2 13:05:15 BST 2010


Looks interesting! I have some spare time, computing capacity and programming experience, so if you want me to help I can.

Otherwise, I'm waiting patiently!

Thanks
Tim

--- On Fri, 2/4/10, Richard Fairhurst <richard at systemeD.net> wrote:

From: Richard Fairhurst <richard at systemeD.net>
Subject: Re: [Talk-GB] Ordnance Survey
To: "Tim Francois" <sk1ppy14 at yahoo.co.uk>
Cc: "'talk-gb OSM List (E-mail)'" <talk-gb at openstreetmap.org>
Date: Friday, 2 April, 2010, 12:55

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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