Approaching precision would be invaluable, Markus, and especially for eventual STEM research, for example, and inter-lingually.
Scott On Jan 11, 2015 6:59 AM, "Markus Krötzsch" <[email protected]> wrote: > On 11.01.2015 14:53, Maarten Dammers wrote: > >> Hi Markus, >> >> Markus Krötzsch schreef op 11-1-2015 om 2:15: >> >>> Hi, >>> >>> Does anybody know the current documentation of the precision of the >>> globe coordinate datatype? This precision was introduced after the >>> original datamodel discussions. >>> >> No clue, I do know we have to do some conversions. See >> https://git.wikimedia.org/blob/pywikibot%2Fcore.git/ >> HEAD/pywikibot%2F__init__.py#L290 >> for the relevant Pywikibot code. >> > > Aha, so Pywikibot converts from "approximate size of the object" to > "approximate precision of the coordinates" (the latter must take into > account how far north the point is). Are you saying that the seemingly odd > precision values in Wikidata have been created in an attempt to draw a > tight bounding box around an object of a given approximate size? Do you > think this encoding of approximate size is a good way of handling this > information? > > Do the reverse on seemingly odd values >> and you probably end up with a nice dimension. Dimension is documented >> at https://www.mediawiki.org/wiki/Extension:GeoData#Glossary >> > > Yes, this operation could surely be reversed without loss of precision if > one knows the "radius" of any body on which we have coordinates. However, I > am not sure if this "size of the object"-interpretation of precision is > what Wikidata wants to say here in the first place. At least in the UI it > looks more like a kind of "precision of measurement" or (worst case) some > mixture of both. > > For Wikidata Toolkit, the big question is whether we should continue to > try and convert the data to something that matches what the UI supports, or > whether we should give up and say "precision is just any number -- make of > it what you want". > > Markus > > _______________________________________________ > Wikidata-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikidata-l >
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