Re: [Wikimedia-l] [Wikidata] GPS data shift - Wikimedia-l

7 Oct 2016

Uh, I leave the details to someone who knows better :) - it is a while
since I checked, and it might indeed be underspecified right now.

To the best of my knowledge, there is only one widely used coordinate
system for each Mars and Titan. I might be wrong. But in the worst case we
would need to specify the default system for either.

I am not saying that the whole thing is not a problem - I am just saying
that the data model, as spec'ed and implemented, has a space for solving
it. It is obvious that without support in the UI the whole thing is
slightly moot anyway.

On Fri, Oct 7, 2016 at 2:23 PM Jan Macura &lt;macurajan(a)gmail.com&gt; wrote:

...

 2016-10-07 20:34 GMT+02:00 Denny Vrandečić &lt;vrandecic(a)gmail.com&gt;om>:

 Wikidata allows to set a coordinate system - it is called a globe or
 coordinate system - on every coordinate. This would be the natural place to
 specify whether it is WGS84 or GDA94 or another system. Most of them are
 Q2, which, as per data model, is indeed WGS84

 Hi Denny,

 can you be more specific about this? So when there is no explicit value in
 the *globe* parametre of GlobeCoordinate, then it is treated as Q2 (this
 corelates with the dumps and every RDF serialization)? It would imply
 geographic coordinates (not the same as WGS84!!). Or is it considered to be
 specifically WGS84, which is Q11902211?
 And how you tell the coordinate system for other celestial bodies like
 Q111 (Mars) or Q2565 (Titan)?

 Thanks a lot
  Jan
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