On Sun, 10 Jun 2007, David Biddulph wrote:

"Tom Anderson" wrote in message
h.li...
On Fri, 8 Jun 2007, Michael R N Dolbear wrote:

Tom Anderson wrote

Also, veering OT, has anyone seen the Multimap redesign? Rather good,
i think. They use a Mercator projection throughout, which means the
A-Z and OS maps are reprojected, and thus have detectably deformed
grid lines, which freaks me out.

Err, the OS, National Grid etc. use a Mercator projection, Transverse
Mercator though (see the bottom of any OS Map).

DOH! Very good point. They must be using different Mercator
projections; i would guess Multimap is using something that works
globally, like Universal Transverse Mercator, whereas the OS grid is
based on something more suited specifically to the UK. But i really
don't know.

Some explanation at
http://www.ordnancesurvey.co.uk/oswe...ts/guide7.html

An excellent document - i've had the PDF sitting on my desktop for a few
weeks!

tom

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