On 2019-02-17 12:55, Eugene Podshivalov wrote:
вс, 17 февр. 2019 г. в 00:11, André Pirard <a.pirard.pa...@gmail.com
<mailto:a.pirard.pa...@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
The method I describe has the advantage that the length written in an
OSM relation would be the only, or almost, number that shows exactly
what it measures instead of other measures said better than others for
no explained precise reason. The relation makes a consensus of what the
river is, the number is right, and anyone having another conception of
the river can explain it and compute the length difference the same way
as the relation does.
Imprecision is to be corrected, just as I'm spending much time using
JOSM to improve to a 20 cm precision errors of 3 to 5 m or more made
with other editors.
I saved as a GPX file the relations that I found for rivers Le Rhône
<https://www.openstreetmap.org/relation/1075117>, La Meuse
<https://www.openstreetmap.org/relation/1075197> and Байкал road
<https://www.openstreetmap.org/relation/318461> (going to Иркытск where
a guy tried to sell me confiscated material such as cranes, lorries and
railway wagons).
Anyone can use JOSM to make routes and save them as *.osm and *.gpx
files without modifying OSM.
I tried to upload them to RouteYou <https://www.routeyou.com/>, but it
would limit the length.
I uploaded them to GPSies
<https://www.gpsies.com/#10_50.6167_5.75_mapnik> but the lengths are
bogus, apparently multiplied by a strange factor.
GPSies
real
×
GPSies name (by PapoudeOSM)
12,275.62 614 18 OpenStreetMap La Meuse
<https://www.gpsies.com/map.do?fileId=qmstzmvbysegiyua> (FR+BE)
15,052.41 812 20
OpenStreetMap Rhône
<https://www.gpsies.com/map.do?fileId=udauuravtkrjjxhp>
33,926.12 1 113 30
OpenStreetMap Байкал road
<https://www.gpsies.com/map.do?fileId=ieubgcbhgjcgbxia>
(Turn off waypoint display)
Anyway, that's the idea.
All the best,
André.
вс, 17 февр. 2019 г. в 01:18, Sergio Manzi <s...@smz.it
<mailto:s...@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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