Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

And thanks for the use cases. This helps a lot with thinking about this. On Thu, Aug 31, 2017, 16:31 Denny Vrandečić wrote: > The reason why we save the actual value with more digits than the > precision (and why we keep the precision as an explicit value at all) is > because the value could be

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

The reason why we save the actual value with more digits than the precision (and why we keep the precision as an explicit value at all) is because the value could be entered and displayed either as decimal digits or in minutes and seconds. So internally one would save 20' as 0.3, but the pr

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

Hi! > I am not sure I understand the issue and what the suggestion is to solve > it. If we decide to arbitrarily reduce the possible range for the Well, there are actually several issues right now. 1. Our RDF output produces coordinates with more digits that specified precision of the actual val

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

The 9 digits precision was based on a survey of Wikipedia we did back then and the most precise GPS coordinates in Wikipedia. Unfortunately, I don't remember anymore what article it was - it was some article listing a number of places that have, due to whatever reason - really high precisions. If s

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

Hi! > I think that should be 5 decimals for commercial GPS, per that link? > It also suggests that "The sixth decimal place is worth up to 0.11 m: > you can use this for laying out structures in detail, for designing > landscapes, building roads. It should be more than good enough for > tracking m

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

Hi! > relied on unless there's a guarantee certain set of data (e.g. all > observatories) have the same accuracy and it is kept up-to-date. > >   > Like in all the wiki-world, this should be guaranteed through the > reference claim, shouldn't it? No, reference only says where the data co

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

Now the spatial reference That's what folks should discuss about. That's a real need, but I think is already solved with an existing property ? or even identifier system ? -Thad +ThadGuidry On Thu, Aug 31, 2017 at 4:30 PM Thad Guidry wrote: > > Havin

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

> > Having it all queryable in Wikidata ? hmmm... not for me, other data > > catalogs and GIS systems handle that job. > > Exactly. > > Glad you agree. :) Once someone comes up with a REAL usecase and not hyperbole, then we can get to work...until then. GIS systems do the job quite well, and many

Re: [Wikidata] Coordinate precision in Wikidata, RDF & query service

Hi! > For one reason...There are already tons of public LIDAR datasets with > point data down to millimeter. > I've even seen monuments and public art sculptures that have LIDAR > datasets down to millimeter precision using WGS84 base references. OK, but: 1. For objects we store in wikidata, what