"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
--
David Biddulph