[Tagging] How to tag house numbers based on decametres?

Simone Saviolo simone.saviolo at gmail.com
Mon Oct 12 08:55:39 BST 2009

If it's only a problem of routing, wouldn't it be better to let the router
do the job? The way would have to be tagged with something like
"numbering=distance", with the correct orientation (from start to end), and
then it would be easy for a program to find out where #23 is.

2009/10/11 John Smith <deltafoxtrot256 at gmail.com>

> 2009/10/11 SLXViper <SLXViper at gmx.net>:
> > John Smith wrote:
> >> I can't think of a good solution for this, a few years ago they
> >> renumbered all properties along roads outside of residential areas to
> >> be the distance in decametres (10s of metres, 100m would be #10 etc)
> >> from the start of the road, they also have even on the right, odd on
> >> the left, this makes it easier for emergency services to find places
> >> because its based on distance.
> >>
> >> I doubt there would be an easy was to interpolate this information for
> >> display, but it could be used to work out end points for routing, and
> >> all we need to know is which end of a way is the start, the rest can
> >> be worked out.
> >
> > The universal solution for such special cases would be tagging single
> > addresses without interpolation. This would provide information
> > - what house numbers do actually exist? In this special case nearly
> > every value could be possible.
> > - where exactly is this house number? Since numbers are based on
> > distance this could also be calculated from the given number - but what
> > if want to know the house number of a given position?
> > The only disadvantage of this method would be a little bit more work "on
> > the ground" - but nothing photo mapping couldn't solve ;)
> As I stated, this sort of tagging wouldn't be that useful for
> displaying/rendering, but could be used for routing.
> If the routing engine is coded in a smart way, it could be used to
> collect the house numbers asked for and use that information to add
> street addressing.
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