[Tagging] Waterway length

[Werner Hoch]

Hi,

it is an optional tag an it is useful for quality checks of the data.

Am Dienstag, den 29.01.2019, 18:37 +0300 schrieb Eugene Podshivalov:
> Hi all,
> The relation:waterway wiki page recommends using "distance" tag for
> "the total length of river in km". Was there any discussion of this
> choice?
> It seems a bit incorrect and confusing, because "distance" is more
> suitable for routes as discribed on its proper page. The existing
> "length" tag would fit better, woudn't it?

length vs. distance is only a wording issue.

The tag just enables you to compare the geometric length with the
lenght tag. If they are close (maybe within 5% of error) the river is
mapped fine.

As many length tags might have been taken from wikipedia (or wikidata)
it is redundant as soon as you add a wikidata tag.
see https://www.wikidata.org/wiki/Q584 (Rhine on Wikidata with its
lenght 1232.7 km).

Geometrical analyses of the river: 1160.34 km.

Not a precics match, but close enought that no major parts of the river
is missing.

Regards
Werner