<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr" class="gmail_attr">вс, 17 февр. 2019 г. в 00:11, André Pirard <<a href="mailto:a.pirard.papou@gmail.com">a.pirard.papou@gmail.com</a>>:</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div bgcolor="#FFFFFF">It's easy to make a script to total up all the segments of a waterway or any way.</div></blockquote><div><br></div><div>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.<br>The more side streams a river has the greater probabily is to break it one day.<br>Here is an example of such complex river which name means "a river of a hundred waterways"<br><a href="https://www.openstreetmap.org/relation/5561722#map=13/51.4077/25.2271">https://www.openstreetmap.org/relation/5561722#map=13/51.4077/25.2271</a><br><br></div><div>Cheers,<br>Eugene</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">вс, 17 февр. 2019 г. в 01:18, Sergio Manzi <<a href="mailto:smz@smz.it">smz@smz.it</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Sorry for the typo: of course Wikip<u><b>a</b></u>dia was meant
to be Wikip<u><b>e</b></u>dia!<br>
</p>
<div class="gmail-m_-1419264434289102372moz-cite-prefix">On 2019-02-16 23:15, Sergio Manzi
wrote:<br>
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<blockquote type="cite">
<pre class="gmail-m_-1419264434289102372moz-quote-pre">Then why don't you submit a paper to the CNFG (<a class="gmail-m_-1419264434289102372moz-txt-link-freetext" href="http://www.cnfg.fr/" target="_blank">http://www.cnfg.fr/</a>) and correct the Wikipadia articles?
Sergio
On 2019-02-16 23:07, marc marc wrote:
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<pre class="gmail-m_-1419264434289102372moz-quote-pre">Le 16.02.19 à 22:32, Sergio Manzi a écrit :
</pre>
<blockquote type="cite">
<pre class="gmail-m_-1419264434289102372moz-quote-pre">A static value for a river length in OSM, without any information about
its source
</pre>
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<pre class="gmail-m_-1419264434289102372moz-quote-pre">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] <a class="gmail-m_-1419264434289102372moz-txt-link-freetext" href="https://en.wikipedia.org/wiki/Rh%C3%B4ne" target="_blank">https://en.wikipedia.org/wiki/Rh%C3%B4ne</a>
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