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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#1
June 10th 07, 10:59 AM
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Project Adorno's A-Z of the London Underground
"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 |
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#2
June 10th 07, 06:44 PM
posted to uk.transport.london
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Project Adorno's A-Z of the London Underground
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 -- Everybody with a heart votes love |
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