Talk:Q520

Altitude, height and others stuffs

Arlo Barnes Athulvis Buller1 cdo256 Cekli829 Harlock81 Jc3s5h JenlovesbigD J. N. Squire Jura1 Kepler-1229b LiMr Manlleus Meodudlye, with only limited amount of time to spend in the foreseable future. Mike Peel mu301 (mikeu) Paperoastro Path slopu Ptolusque Romuald 2 Sarilho1 Sherman Alexander Shisma Simon Villeneuve SM5POR Tom.Reding VIGNERON Wallacegromit1 - generally like to add ground and space observatory instrument data Ysogo Jck1337

Notified participants of WikiProject Astronomy

Following a question by J. N. Squire on Wikidata:Bistro on how to improve the elevation above sea level (P2044) and height (P2048) of Olympus Mons (Q520)?

After looking a bit more into it, there is still a lot of work on this item, and for all dimensions of Olympus Mons (not the the altitude/height). As this moutains is quite famous, I think it has a good potential as we could easily gather sources and turn the item into a Wikidata:Showcase items. Anyone interrested?

Here some questions already:

• description are missing in some not-so-uncomon langages…
• there is still some imported from Wikimedia project (P143) = French Wikipedia (Q8447) which should be remove and replace,
• most property only have one value, without qualifier or ranks
• official name (P1448) says « Olympus Mons (English) » shouldn't it be « Olympus Mons (Latin) » or « Olympus Mons (mul) »?
• should we create a separate item for Nix Olympica for the classical albedo feature? (could be useful to be more precise on named after (P138) and to allow to remove the aliases Nix Olympica)
• etc.

Cdlt, VIGNERON (talk) 09:14, 11 September 2017 (UTC)

Some others questions :

• I forgot the elevation above sea level (P2044) and height (P2048) question (and topographic prominence (P2660) too, I left a message on Wikidata talk:WikiProject Mountains), not sure what to do with it…
• location (P276) and located in/on physical feature (P706) ; is it ok to put the quadrangles in location (P276) ?
• how to link with Tharsis Montes (Q1423213) ? with located in/on physical feature (P706) or with part of (P361)/has part(s) (P527), in other words, is it more a region or a group of montes? WikiProject Mountains advise to use located in/on physical feature (P706) for mountain ranges.
• should we create (a) separate item(s) for the caldera(s)?

Cdlt, VIGNERON (talk) 14:14, 11 September 2017 (UTC)

For Tharsis Montes (Q1423213), it's definitely a region. It's a highland region with montes in it, but there are more that those there. ^^ J. N. Squire (talk) 14:18, 11 September 2017 (UTC)

Thank you for the confirmation . Cdlt, VIGNERON (talk) 14:22, 11 September 2017 (UTC)

Should elevation above sea level (P2044) even be used in this case ? It's defined relatively to the sea level which is not relevant on celestial bodies without a global sea level, like Mars in this case. Maybe another property should be created for each celestial body ? Or a generic property where you specify the datum (aka level 0) and/or the determination method (P459). (according to fr:Altitudes et coordonnées géographiques sur Mars, different method of determination and different datum can lead to high variations : 21km to 27km for Mount Olympus). -- FoeNyx (talk) 10:19, 10 October 2020 (UTC)

Martian coordinates

70°9'9"N, 70°9'9"E was a totally wrong data. I am not sure if P625 is a correct parameter to place any data which is not on Earth, so I rather left it empty (correct it if I am wrong: 18.65 N, 226.2 E, on a Mars map) JSoos (talk) 19:41, 20 October 2020 (UTC)

@JSoos: the data was not 70°9'9"N, 70°9'9"E but <http://www.wikidata.org/entity/Q111> Point(70.1525 70.1525) which is explicitly on Mars and not on Earth. I reverted you and reverted the vandalism of last July, now we are back at <http://www.wikidata.org/entity/Q111> Point(226.2 18.65) (with the right reference) which is fine and correct. Cheers, VIGNERON (talk) 09:39, 3 November 2020 (UTC)