[Tagging] Data redundancy with "ref" tag on ways vs relations

Paweł Paprota ppawel at fastmail.fm
Mon Jul 30 20:41:05 BST 2012


David,

As I wrote - I am only producing reports for Poland and for my country
there are very few complex situations and it really is straightforward
to clearly see data duplication - having ref on ways has no value
because everything is expressed in relations.

>
> If you have a tool that says "US 136 includes ways whose ref tags say
> 'I-465' and this is an error" then you need to realize that route
> relations
> and way ref tags serve different purposes and use cases, or at least that
> sometimes it's impractical for them to match perfectly.

Like I wrote - a user requested this validation, I implemented it and
after running it on the data I immediately noticed the data duplication
problem and shared my thoughts here on the list because this use case of
trying to sync relations with way tags is a mistake in my opinion.

If you're saying that you (as in - mappers in the US) are using it for
different purposes, that's perfectly fine - I'm not proposing removing
all "ref" tags from ways. I'm just rising an issue with blindly copying
data over to different places - that is a road to nowhere.

Paweł



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