[mkgmap-dev] housenumbers and addr:interpolation

Tue Dec 2 08:02:10 GMT 2014

Hi WanMil,

(did not read this yesterday)

I agree in most points, but maybe the information that is 
given with the addr:interpolation tag should also be used?
The stats in taginfo say that most of them are odd/even,
so we can ignore them. But what about "all" ?

Do you have time to code the interpretation of the addr:interpolation tag?
I don't have an idea how to use it besides simply adding all 
housenumbers, but that seems a bit memory costly.

Gerd

> Date: Mon, 1 Dec 2014 22:28:50 +0100
> From: wmgcnfg at web.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] housenumbers and addr:interpolation
> 
> 
> > Both: associatedStreet and addr:interpolation are documented:
> > http://wiki.openstreetmap.org/wiki/Relation:associatedStreet
> > http://wiki.openstreetmap.org/wiki/Key:addr#Tags_for_interpolation_ways
> 
> "As long as we don't have a node or building outline for each 
> house(number) along a way, it's also possible to use automatic number 
> interpolation. For that, draw a way connecting the existing house 
> numbers and mark it with the type of interpolation as shown in the 
> picture above. Additional tags such as addr:street=* are still added to 
> the objects with the addr:housenumber=* tag, the interpolation way only 
> gets the addr:interpolation=* tag. "
> 
> So in other words, addr:interpolation should connect two or more 
> elements that are fully tagged with addr:housenumber and addr:street. So 
> there is no improvement in adding an addr:interpolation handling to 
> mkgmap. When removing the interpolation line you still have the single 
> elements with the housenumber information. They are already converted to 
> the Garmin format which automatically interpolates.
> 
> There is one exception: In case an interpolation covers more than one 
> street segment:
>         ´|
> ========┴=======
>   1------------15
> 
> The interpolation 1 to 15 spans over the crossroads. The street have two 
> segment so the current algorithm ignores the interpolation and would 
> assign housenumber 1 to the left and 15 to the right segment. This could 
> be the place where mkgmap might add two virtual housenumber nodes e.g. 9 
> and 11.
> 
> >
> > See statistics too:
> > https://taginfo.openstreetmap.org/keys/addr:interpolation
> > https://taginfo.openstreetmap.org/tags/type=associatedStreet
> >
> 
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