[Tagging] Waterway length

[Eugene Podshivalov]

вс, 17 февр. 2019 г. в 00:11, André Pirard <a.pirard.papou at gmail.com>:

> It's easy to make a script to total up all the segments of a waterway or
> any way.
>

It will work but only if the entire river from its spring to mouth is drawn
precisely enough, all relation roles are labeled properly and nobody breaks
the labeling by intent or mistake some day.
The more side streams a river has the greater probabily is to break it one
day.
Here is an example of such complex river which name means "a river of a
hundred waterways"
https://www.openstreetmap.org/relation/5561722#map=13/51.4077/25.2271

Cheers,
Eugene

вс, 17 февр. 2019 г. в 01:18, Sergio Manzi <smz at smz.it>:

> Sorry for the typo: of course Wikip*a*dia was meant to be Wikip*e*dia!
> On 2019-02-16 23:15, Sergio Manzi wrote:
>
> Then why don't you submit a paper to the CNFG (http://www.cnfg.fr/) and correct the Wikipadia articles?
>
> Sergio
>
>
> On 2019-02-16 23:07, marc marc wrote:
>
> Le 16.02.19 à 22:32, Sergio Manzi a écrit :
>
> A static value for a river length in OSM, without any information about
> its source
>
> every tag you add into osm have a changeset with a source tag, isn't it?
> so adding the lenght should/must also have a source (extrapolation (sum
> of all way of a relation) of osm data is a source)
>
> a few month ago, I have checked the length of Rhône [1]
> the french wikipedia list 2 sources for the lenght... both are very fair
> away of the lenght found after some work on osm data.
> which one to choose? osm without hesitation. maybe it is not fair but at
> least it is verifiable (everyone can load the relationship, see the
> result and correct errors if necessary) while the other 2 sources
> (including the official French source) are totally unverifiable.
>
> unfortunately I did not send in osm the result of the cleaning because
> it concerned partly errors in osm (mainly roles in the relationship)
> but I started by purging everything that didn't interest me in the
> relationship before fixing. it will have to be done again
>
> [1] https://en.wikipedia.org/wiki/Rh%C3%B4ne
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