Wikidata talk:WikiProject Maps

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Map projection a subclass on map?[edit]

Shouldn't the map projection be detached from the Map class? Maps cannot be instances of map projections. --Susannaanas (talk) 08:02, 21 October 2015 (UTC)Reply[reply]

I changed the subClass of property of map projection (Q186386) to projection (Q13415428) which is instance of (P31) Wikimedia disambiguation page (Q4167410) although the linked pages are not. Perhaps a word of advice from senior editors would help. I would continue changing the the instance of (P31) property of map projection (Q186386) to something more suitable. --Susannaanas (talk) 08:27, 21 October 2015 (UTC)Reply[reply]
@Susannaanas: Being a novice rather than senior editor, I agree that map projection (Q186386) does not belong in the map type tree. The issue with Wikimedia disambiguation page (Q4167410) was apparently resolved in March 2018.
I would like some way of indicating the projection used for a map, in either general (such as transverse Mercator projection (Q1329238)) or specific terms (stating the tangential longitude and possibly other parameters). There is a property for scale (P1752) but not a corresponding one for projection (where the scale normally applies only in specific areas, such as along the tangent). Or did I miss something?
But before rushing ahead and writing a proposal for another property, even if desirable in the long run, I'd like to look at the entire map classification spectrum, and figure out what other technical aspects of a map should be possible to specify, such as geodetic reference system (Q1502887) (Ordnance Survey National Grid (Q1967305)), orientation (P7469) (more generic than reversed map (Q2620815)), cartographic art style (Q1792644) (National Geographic Society (Q167186) or kiri-ezu (Q15823625)), typography (Q159964) (Fraktur (Q148443)), map map legend (Q1200435) or map folding (Q6753749) (Falk-Plan), and what Wikidata properties to use for each.
While some of these may well be indicated using subclass of (P279), I find that a rather clumsy method, and would prefer a separate property with fewer usage restrictions. For the time being, I would suggest using has quality (P1552) map projection (Q186386) with qualifiers of (P642) projection (generically expressed) and/or defining formula (P2534) formula (when projection is insufficient).
Using this notation during a development period may stimulate editors to experiment when they encounter odd map characteristics without confusing the subclass hierarchy, rather than skip those details because there isn't a fixed property ready to be used. Innovative uses may be detected automatically and considered for standardization later on. --SM5POR (talk) 17:00, 30 June 2020 (UTC)Reply[reply]

Property proposal: Commons map category[edit]

I think this would be useful. Comments very welcome. Jheald (talk) 01:13, 17 February 2017 (UTC)Reply[reply]

Adding data for 7.5 Minute Quadrangles[edit]

@Susannaanas:, @Tobias1984:, @Enock4seth:, @Yurik:, All...

Please consider the following two items, for my question below.

Where, in the first wikidata item, would I add the latitude and longitude data that you see in the second item? I've added quite a few USGS pubs for these quadrangles thinking there was a way to define the physical area covered by the maps. I guess this is something I should have understood before pulling the data into Wikidata. I thought maybe the northernmost, eastern, southern, and westernmost points would be useful, but those aren't necessarily the corners of the quadrangle. Have you any advice?

Thank you for any recommendations. -Trilotat (talk) 22:54, 6 November 2018 (UTC)Reply[reply]

"Repinging" requesting your suggestions. No one has replied; perhaps I'm doing this incorrectly. Trilotat (talk) 16:31, 2 December 2018 (UTC)Reply[reply]

Locator-tool[edit]

Commons has a very convenient Commons:Commons:Locator-tool for entering or especially for adjusting coords. Is someone studying how to give WD something similar? Jim.henderson (talk) 17:55, 21 May 2020 (UTC)Reply[reply]

Non-geographic maps[edit]

I see that map (Q61868351) was created in February 2019 and map (Q4006) was made a subclass of it, but it remains remarkably underused. I hope it's ok to move some non-geographic map types such as brain atlas (Q17047956) out of map (Q4006) and up a level? What about planetary maps for Solar system bodies other than Earth; where do they belong?

By the way, is there some predefined list of WikiProject Maps participants that I should ping? --SM5POR (talk) 18:03, 30 June 2020 (UTC)Reply[reply]