seav added a comment.
I can't think of any items right now that //need// to have millimeter-precision coordinates. But there are certainly objects that can have sub-meter precision. For example, there are at least a couple of geodetic survey markers in Finland (Q10684553 and Q10682441) that have a stored precision of 0.000001 (decimeter-level). And somebody could survey <https://chrismolloy.com/p152.php> the locations and coordinates of the existing Arago medallions found in Paris that marks the Paris meridian and add them all to Wikidata and these should have sub-meter precision. Sure, these coordinates may become outdated because we are assuming the WGS84 datum and plate tectonics is a thing, but these coordinates could be qualified with a point-in-time qualifier. TASK DETAIL https://phabricator.wikimedia.org/T232984 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: seav Cc: Smalyshev, Lucas_Werkmeister_WMDE, Rishikumaralwal, seav, Aklapper, darthmon_wmde, DannyS712, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, _jensen, rosalieper, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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