Re: [Tagging] Waterway length

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 > ch

Re: [Tagging] Waterway length

It is not possible to calculate length of an international river when working with country extracts. Eugene пн, 18 февр. 2019 г. в 07:00, André Pirard : > On 2019-02-16 23:00, Markus wrote: > > On Sat, 16 Feb 2019, 20:06 Eugene Podshivalov >> What is the best way to correct this, so that all ot

Re: [Tagging] Waterway length

On 2019-02-16 23:00, Markus wrote: On Sat, 16 Feb 2019, 20:06 Eugene Podshivalov wrote: What is the best way to correct this, so that all other langauge pages got the correction as well? I'm not aware of any other way than correcting it on each page. I've j

Re: [Tagging] Waterway length

On 2019-02-17 12:55, Eugene Podshivalov wrote: вс, 17 февр. 2019 г. в 00:11, André Pirard >: 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 p

Re: [Tagging] Waterway length

> > it is wrongly named (distance instead of length) Has already been corrected (at least in the english wiki) > it can assume multiple different values according to different sources "length:source" can resolve this if needed. > it is unverifiable "on the ground" it is IMNSHO useless (*just p

Re: [Tagging] Waterway length

I think I know understand what usage you want to do of that "waterway length" datum (/or at  least that's what I'm reading in your last message/): use it as a "control" for checking if the waterway's segments add up to the "official" (/whatever that can mean.../) waterway length.  Or at least in

Re: [Tagging] Waterway length

вс, 17 февр. 2019 г. в 15:18, Sergio Manzi : > > That's as old as data processing: "*garbage in, garbage out*". Let's > fix the data. Fixing data is a good thing but from utilization in production point of view the choice between unstable and stable data is not questioned. Competeness of data is

Re: [Tagging] Waterway length

On 2019-02-17 12:55, Eugene Podshivalov wrote: > > 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. That's as old as data processing: "/garbage i

Re: [Tagging] Waterway length

вс, 17 февр. 2019 г. в 00:11, André Pirard : > 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

Re: [Tagging] Waterway length

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 2

Re: [Tagging] Waterway length

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 ta

Re: [Tagging] Waterway length

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 rela

Re: [Tagging] Waterway length

Thank you, Markus. Cheers, Eugene вс, 17 февр. 2019 г. в 01:01, Markus : > On Sat, 16 Feb 2019, 20:06 Eugene Podshivalov >> What is the best way to correct this, so that all other langauge pages >> got the correction as well? >> > > I'm not aware of any other way than correcting it on each page

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019, 20:06 Eugene Podshivalov What is the best way to correct this, so that all other langauge pages got > the correction as well? > I'm not aware of any other way than correcting it on each page. I've just done this and also added a note that this tag lacks verifiability. >

Re: [Tagging] Waterway length

TBH, I'm all with you (/and maybe I'm seen as an eccentric too.../) and I see the tagging of waterways length as egregiously useless. Beside, I smell a lack of verifiability [1] in this waterways property: I'm not a geographer, by far, but in the years I made up my mind that this is one of thos

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019, 15:26 Andy Mabbett wrote: I would suggest that values entered by human mappers are more likely to be "error prone"; and that we should be more concerned with on-the-ground reality than "offical" figures. It's easy to make a script

Re: [Tagging] Waterway length

What is the best way to correct this, so that all other langauge pages got the correction as well? Cheers, Eugene сб, 16 февр. 2019 г. в 21:57, Markus : > On Sat, 16 Feb 2019, 00:43 Eugene Podshivalov >> The use of "distance" for river length distracts me as well. >> But I'm trying to find its

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019, 15:26 Andy Mabbett I would suggest that values entered by human mappers are more likely > to be "error prone"; and that we should be more concerned with > on-the-ground reality than "offical" figures. > I agree. Besides, official figures may not be compatible with OSM's licen

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019, 00:43 Eugene Podshivalov The use of "distance" for river length distracts me as well. > But I'm trying to find its origin on this wiki page > https://wiki.openstreetmap.org/wiki/Relation:waterway > distance * (optional) Total

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019 at 13:46, Eugene Podshivalov wrote: > > сб, 16 февр. 2019 г. в 16:30, Andy Mabbett : >> Why would we tag either, when software can calculate them? > Calculated value may differ from the official one and is error-prone I would suggest that values entered by human mappers are

Re: [Tagging] Waterway length

W dniu 16.02.2019 o 15:00, Sergio Manzi pisze: > On 2019-02-16 14:46, Eugene Podshivalov wrote: >> Calculated value may differ from the official one ... > > Official according to whom? > Good question - who can we trust? The question is also how to calculate them? If a river has a fork (or even mu

Re: [Tagging] Waterway length

On 2019-02-16 14:46, Eugene Podshivalov wrote: > Calculated value may differ from the official one ... Official according to whom? From https://en.wikipedia.org/wiki/Nile#cite_note-length-1 : /"The length of the Nile is usually said to be about 6,650 km (4,130 mi), but reported values lie a

Re: [Tagging] Waterway length

сб, 16 февр. 2019 г. в 16:30, Andy Mabbett : Why would we tag either, when software can calculate them? Calculated value may differ from the official one and is error-prone, e.g. when a segment is deleted by mistake or when a segment role is changed between main and side stream. Cheers, Eugene сб

Re: [Tagging] Waterway length

On Fri, 15 Feb 2019 at 23:31, Graeme Fitzpatrick wrote: > The Nile rises in Lake Victoria & travels to the Mediterranean with > a length of ~6695km (depending on reference used), but the distance > between Kampala, on the north shore of Lave Victoria & Cairo is only > 3300km. Why would we tag ei

Re: [Tagging] Waterway length

On 2019-02-16 00:41, Eugene Podshivalov wrote: The use of "distance" for river length distracts me as well. But I'm trying to find its origin on this wiki page https://wiki.openstreetmap.org/wiki/Relation:waterway

Re: [Tagging] Waterway length

The use of "distance" for river length distracts me as well. But I'm trying to find its origin on this wiki page https://wiki.openstreetmap.org/wiki/Relation:waterway distance * (optional) Total length of river in kmCheers, Eugene сб, 16 февр. 201

Re: [Tagging] Waterway length

On Sat, 16 Feb 2019 at 01:38, Eugene Podshivalov wrote: > André, that's correct but do you happen to know why "distance" was > selected for route and waterway length then? > No idea why, but rivers should certainly be shown with a length. EG The Nile rises in Lake Victoria & travels to the Medi

Re: [Tagging] Waterway length

André, that's correct but do you happen to know why "distance" was selected for route and waterway length then? Cheers, Eugene вт, 29 янв. 2019 г. в 22:41, André Pirard : > On 2019-01-29 16:37, Eugene Podshivalov wrote: > > Hi all, > The relation:waterway wiki page >

[Tagging] Waterway length

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 d