[OSM-talk] address interpolation

[Jochen Topf]

On Sun, Sep 27, 2009 at 06:33:25PM +0100, David Earl wrote:
> I'm experimenting with adding house numbering for the first time (and 
> using the address interpolation plugin).
> 
> One common case I came across was 25, 25A, 25B, ...
> 
> I wonder whether addr:interpolation=alphabetic could include this case 
> (in essence when the first node has no letter, the second would be A, 
> the next B and so on up to the explicit final one, rather than always 
> starting on a letter - though that existing case isn't excluded of 
> course). It doesn't need any change other than in how it is documented. 
> The JOSM plugin could easily support this too.
> 
> Where it's just 25 and 25A (usually a house that's been built in a gap) 
> it hardly matters, but I found them 3, 4 and 5 in a row like this.

Problem is: How do you know where the alphabet starts? If hebrow housenumbers
go from 25alef to 25yod, its resonably easy to do this, because the characters
in the alphabet will probably be in order in the Unicode list. But if you
have the number 25 to 25yod, its harder to find this automatically. Basically
you'll need a list of all alphabets with all their characters. I guess we
could allow it for the latin alphabet and see where it goes.

Jochen
-- 
Jochen Topf  jochen at remote.org  http://www.remote.org/jochen/  +49-721-388298