{
  "id": "#002",
  "title": "雪結晶マクロ",
  "visibility": "public",
  "file": {
    "name": "observation02_public.jpg",
    "type": "image/jpeg",
    "dimensions": "4032x3024",
    "sha256": "1e66f46c2ef29f81329fbcf8e0951dfa87a0696d2e2da31770a2572f41a9f6cf"
  },
  "capture": {
    "datetime": "2025-02-20T13:15:45+09:00",
    "source": "EXIF DateTimeOriginal + OffsetTimeOriginal"
  },
  "location": {
    "source": "EXIF GPS（プライバシー保護のため小数2桁に丸め）",
    "latitude_deg": 43.43,
    "longitude_deg": 142.64,
    "altitude_m": 1012.13,
    "region": "北海道・十勝連峰方面"
  },
  "gear": {
    "make": "Apple",
    "model": "iPhone 13 Pro Max",
    "lens": "iPhone 13 Pro Max back triple camera 1.57mm f/1.8"
  },
  "subject": "雪結晶マクロ / 樹枝状結晶",
  "observation_note": "北海道・十勝連峰方面のツアー中、降雪時に撮影。樹枝状結晶が崩れず残る。",
  "provenance": "2025-02-20 撮影。北海道・十勝連峰方面のツアー中に観測・撮影。",
  "notes": "公開版はGPSタグ完全除去・座標小数2桁。Arweave公開対象。"
}