On Tue, 8 Apr 2008, Lester Caine wrote:
> How DO we currently identify all roads in the UK, so
> that we don't end up with some of the simply silly links that the likes of
> Autoroute returns when asking for a location.
>
> We need a consistent UNIQUE index method that will allow all 'ref=M11'
> elements in the UK to be identified as that one element.
Why do we need them all to be identified with a single element? You cite
route planning as a reason but I really don't see why it is applicable -
your route planner doesn't need to know that two bits of road with a gap
between them are (administratively) the same road.
In fact, there are only 2 times a route planner needs to know about the
road's ref or name:
1. When producing instructions ("Take the 3rd exit onto the M11")
2. As you cross from one way to another in order to determine if it is
really a junction or just a continuation of the same way (you don't want
it to tell you to "continue along the M11" at arbitrary points just
because the way has been split there, and you might want to impose some
kind of penalty for turning off the road to prevent the route from
containing too many small turns).
Putting all of the separate bits of the UK's M11 in a single relation
sounds about as silly as putting all the roads in the UK called "Station
Road" in a single relation - they are separate roads and there is no good
reason to treat them in any other way.
- Steve
xmpp:[EMAIL PROTECTED] sip:[EMAIL PROTECTED] http://www.nexusuk.org/
Servatis a periculum, servatis a maleficum - Whisper, Evanescence
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