[Tagging] Tagging of topographic areas with a name

Janko Mihelić janjko at gmail.com
Tue Aug 6 15:04:42 UTC 2013


2013/8/6 Yuri D'Elia <wavexx at users.sourceforge.net>

>
> Might still be problematic. A forest, sometime lakes, rivers for sure
> and many other big polygons will cross the boundary of the mountain group.
>

I wouldn't tag rivers or forests with those tags, just nodes or little
ways. Tagging everything within the mountain with that tag would create
lots of data that could be considered garbage. But if you only tag peaks
and alpine_huts, maybe it could be manageable.


>
> It's kind of unfortunate, because a mountain group will span across
> italian regions and include parts of several valleys. Of course,
> likewise, valleys have the same problem. It's not a hierarchical
> information either.
>
> It's really a topographical information, and I feel like tagging objects
> within or using relations might be really problematic. Just imagine what
> kind of "spotty" tagging would you have for big mountain groups. Huts
> and peaks would definitely not be enough for a decent boundary.
>

I made this picture, maybe it clears my point:

http://i.imgur.com/CeFG2WO.png

A software would look for the lowest contour line (altitude) that is
between points with different mountain tags. I have a feeling it would
work, but I never tried it. Maybe some problems would arise.


>
> But also drawing big areas is kind of ugly :(.
>

Maybe the solution is a separate OSM database, used specifically for these
polygons.

Janko
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