Re: [OSM-talk] Wikidata accuracy (Was: MAPS.ME edits - partly sub-standard)

[Martin Koppenhoefer]

2016-08-27 7:57 GMT+02:00 Martin Koppenhoefer :

> I propose to remove the metropolitan area instance relation from q84.



FWIW: I've removed it. Unlike OSM or wikipedia, there wasn't any
possibility to explain the edit (or I didn't find it), so I also added a
line to the discussion page.

Cheers,
Martin
___
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk

Re: [OSM-talk] Wikidata accuracy (Was: MAPS.ME edits - partly sub-standard)

[Michael Andersen]

A lot of Wikidata was and is originally scraped from Wikipedia, but there are 
other ways to populate or update it (including manually).
Consider for example 
https://da.wikipedia.org/wiki/Det_Kongelige_Danske_Musikkonservatorium. The 
subject was moved to a new building in 2008, but the coordinates in the 
article was still pointing to the old site until I discovered it in may this 
year (while editing OSM in the area). I solved the problem by manually copying 
updated coordinates from JOSM (ctrl-shift-c) to Wikidata and changing the 
article to use a template which pulls coordinates from Wikidata (for me this 
is much simpler than once again having to research the Wikipedia coordinates 
format).
So now we have at least one case of danish wikipedia being "derived" from 
Wikidata :-)
There are a number of other wikipedias (english, german etc.) on the same 
subject, which could be changed to use similar templates. So if in a number of 
years the subject was moved again, it would be very simple to again just 
update coordinates on Wikidata and have all the Wikipedias automatically 
reflect this.

Fredag den 26. august 2016 12:51:00 skrev Dave F:
> I'm surprised Wikidata is different to Wikipedia. I thought the former
> was derived from the latter.
> (btw The 7,172,036 figure isn't the latest data in Wikidata)
> 
> https://en.wikipedia.org/wiki/London
> 
> Cheers
> Dave F

___
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk

Re: [OSM-talk] Wikidata accuracy (Was: MAPS.ME edits - partly sub-standard)

[Martin Koppenhoefer]

sent from a phone

> Il giorno 26 ago 2016, alle ore 13:51, Dave F  
> ha scritto:
> 
> I'm surprised Wikidata is different to Wikipedia. I thought the former was 
> derived from the latter.
> (btw The 7,172,036 figure isn't the latest data in Wikidata) 


oops, sorry, you are right, there's a 2012 estimate in wikidata (8,416,535), 
but the 2011 census is missing, Wikipedia/en (London) has a mid 2015 estimate.

in osm we could decide to use the population of the urban area (built up, 
former "urban area") on the place object (especially if it's a node): 
https://en.wikipedia.org/wiki/Greater_London_Built-up_Area
and http://www.nomisweb.co.uk/articles/747.aspx
the other figure could go on the administrative boundary object.


what I find quite strange in wikidata: both, the capital object from the main 
article
https://m.wikidata.org/wiki/Q84
and the London Commuter Belt
https://m.wikidata.org/wiki/Q2422792
are marked as instances of "Metropolitan Area"s but the population figures for 
the former are referring to the city, not to the metropolitan area, and the 
latter has no population info, unlike Wikipedia which quotes Eurostat with 
provisional 14,031,830 for 2014. I propose to remove the metropolitan area 
instance relation from q84.

There's also Greater London which is here in wikidata 
https://m.wikidata.org/wiki/Q23306 and had a population of 8,308,369  in 2012, 
likely in Osm this can be found or puzzled together from administrative 
entities (did not check).

cheers,
Martin 
___
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk

Re: [OSM-talk] Wikidata accuracy (Was: MAPS.ME edits - partly sub-standard)

[Dave F]

I'm surprised Wikidata is different to Wikipedia. I thought the former 
was derived from the latter.

(btw The 7,172,036 figure isn't the latest data in Wikidata)

https://en.wikipedia.org/wiki/London

Cheers
Dave F


On 26/08/2016 11:57, Martin Koppenhoefer wrote:


2016-08-26 12:20 GMT+02:00 Dave F >:


All tags can get filled with useless data.

Good use of tag:
http://www.openstreetmap.org/node/107775





btw, there seem to be some less useful tags also on this node, at 
least there's a slight redundancy and these could eventually be pulled 
from wikidata (or determined spatially in the first case) when needed:
is_in:country 
 
United Kingdom


is_in:country_code 
 
GB


is_in:iso_3166_2 GB-ENG


On the other hand I have noticed that wikidata has this population: 
7,172,036 while osm has 8.416.535, for wikidata the most recent figure 
is from 2001 so ours is likely more recent and relying completely on 
wikidata for some tags seems still a bit too early.


Cheers,
Martin


___
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk