Re: [Wikidata-l] Coordinate datatype -- update

I’ll just mention a data quality problem that’s annoyed me with DBpedia so far. People often get confused if longitude is east or west, so they get the sign wrong. If you plot coordinates from Wikipedia you find a shadow image of Europe, for instance, reflected across the prime meridian. It turns out, however, there are a bunch of shipwrecks and seamounts out there too. It would be nice to see these cleaned up. *From:* Denny Vrandečić &lt;denny.vrandecic(a)wikimedia.de&gt; *Sent:* Thursday, January 17, 2013 10:13 AM *To:* Discussion list for the Wikidata project.&lt;wikidata-l(a)lists.wikimedia.org&gt; *Subject:* Re: [Wikidata-l] Coordinate datatype -- update Nine decimals is what is used for WAAS reference stations, which appear in Wikipedia. < http://en.wikipedia.org/wiki/Wide_Area_Augmentation_System#List_of_referenc… I actually also think it is a bit excessive, but it is there and looks legit. I'd rather support it than not (and save 20 MB of disk space). Some of the validations sound useful (no values greater than 360), others a bit restrictive (same number of decimal places). I'd prefer the software to be rather lax than draconic (it *is* a wiki, after all). I agree about trailing zeros. They are covered by the precision parameter. Thanks for the input! Cheers, Denny 2013/1/17 Andy Mabbett &lt;andy(a)pigsonthewing.org.uk&gt; > On 17 January 2013 10:19, Denny Vrandečić &lt;denny.vrandecic(a)wikimedia.de&gt; > wrote: > > If you have any further comments on the datatype for coordinates, say so > > here. > > > < > http://meta.wikimedia.org/wiki/Wikidata/Development/Representing_values#Coo… >> > Nine decimal places seems excessive. > > We can apply some rudimentary validation: no latitude or longitude > values greater than 360, for instance (perhaps other criteria > dependent on the coordinate system); latitude and longitude should > have the same number of decimal places; trailing zeroes are > significant and must not be discarded. > > -- > Andy Mabbett > @pigsonthewing > http://pigsonthewing.org.uk > > _______________________________________________ > Wikidata-l mailing list > Wikidata-l(a)lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata-l > -- Project director Wikidata Wikimedia Deutschland e.V. | Obentrautstr. 72 | 10963 Berlin Tel. +49-30-219 158 26-0 | http://wikimedia.de Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e.V. Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für Körperschaften I Berlin, Steuernummer 27/681/51985. ------------------------------ _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l _______________________________________________ Wikidata-l mailing list Wikidata-l(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-l