Noah,
On Tuesday, Nov 30, 2004, at 09:55 Europe/London, Noah Raford wrote:
> Dear Anzir,
>
> Do you mean an all-point to all-point travel time map? Something
> displaying the average travel time to all points? This sounds similar
> to metric integration, which would of course be focussed on the centre
> of the UK. I think you probably mean something more sophisticated
> though, reflecting the configurational conditions of the road network.
> Someone probably has done something similar but I haven't come across
> it
> myself. Good luck!
Unfortunately not... this was simply a map of the UK distorted to show
best travel times from London. Something that was more complex or
sophisicated than this would be very difficult for a network where the
travel time on links can vary according to their type or other
characteristics. For example, on rail, Leeds is 2 hours from London by
fastest train, and also 2 hours from Birmingham (which is about half
the distance).
Such a flat map cannot display such things. A GIS based contour map,
however, would be more suited to displaying that information (I guess
you would have fields with travel time from London, Birmingham,
Manchester, Glasgow, etc. in the dataset and simply draw contour maps
from each. I know this is possibly a little simplistic, but going
beyond this would require the GIS to literally follow the network in
the way the OS' routing plug ins can do (I've used OSCAR before, but
this doesn't give travel times. We were also trying to use it for
calculating walking distances when it's a road based tool, which meant
we couldn't exploit footpaths and alleyways).
--
Anzir Boodoo MRes MILT Aff. IRO
transcience, Leeds Innovation Centre, 103 Clarendon Road, LEEDS LS2 9DF
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