{
  "meta": {
    "schemaVersion": "1.0",
    "datasetType": "hk-derived-monthly-linear-interpolation",
    "title": "信譽車行原圖月度觀察及推算",
    "derived": true,
    "derivedAt": "2026-10-22T09:00:16.879318Z",
    "derivedDate": "2026-10-22",
    "provider": "信譽車行 HK Taxi Trade",
    "sourceUrl": "https://hktaxitrade.com/price-history/",
    "sourceUpdatedAt": null,
    "sourceRetrievedAt": "2026-10-22T08:58:58Z",
    "sourceFile": "outputs/taxi-chart-white-preview/dist/hk-history-source.json",
    "sourceFileSha256": "12d3a64e743a8dbea5c8e85ac7d3ecee10b4239d2393a03ff2f2a920161406f4",
    "sourceWrapperSha256": "b61d09d7054ccf170bbca70d909bfd057d2a691e44e0aa23cc8e4cefaf42ff98",
    "rawSourceFileSha256": "a2451b2c1bf74293f2c3efda13f9e75871fb53ebf87a47b87c757b63677037e5",
    "sourceSeriesId": "urban",
    "sourceChartIds": [
      "hk-one-year",
      "hk-ten-year"
    ],
    "transcribedSourceChartCount": 2,
    "originalChartLibraryEntryCount": 24,
    "sources": [
      {
        "id": "hk-one-year",
        "title": "過往12個月的士牌價走勢圖",
        "url": "https://hktaxitrade.com/media/price-history/1b4167b23ce15597.png",
        "localAsset": "assets/hk-history/1b4167b23ce15597.png",
        "type": "long-term-original-image",
        "period": null,
        "numericTranscribed": true,
        "sha256": "d0718ba811b81851efab064d772ce869299b56bd1fa60c64a3f0c47de5f6ec6c",
        "bytes": 165057,
        "width": 1920,
        "height": 1080
      },
      {
        "id": "hk-ten-year",
        "title": "過往十年的士牌價走勢圖",
        "url": "https://hktaxitrade.com/media/price-history/2a4225d0e0fa0189.png",
        "localAsset": "assets/hk-history/2a4225d0e0fa0189.png",
        "type": "long-term-original-image",
        "period": null,
        "numericTranscribed": true,
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    ],
    "unit": null,
    "currency": null,
    "unitDisplay": "原圖數值（未註單位）",
    "method": {
      "id": "linear-absolute-monthly",
      "label": "相鄰已知原圖數值的總差額按實際月份間距等分",
      "formula": "estimated = from + (to - from) * step / steps",
      "stepsDefinition": "相鄰已知月份的月數間距；缺月數為 steps - 1",
      "shareOfGapDefinition": "累計差額比例 step / steps；每月增量佔總差額 1 / steps",
      "compounding": false,
      "extrapolation": false,
      "rounding": "Fraction 精確計算，輸出 JSON 數字前不作顯示四捨五入"
    },
    "statusLabels": {
      "observed": "原圖觀察",
      "estimated": "線性推算"
    },
    "limitations": [
      "只採 HK Taxi Trade 兩張已轉錄長期圖的標示數值；原圖沒有明示幣別或單位，保留 valueRaw，不換算萬港元或港元。",
      "觀察月份以原圖日期標籤為準；原圖橫軸等距不代表實際月份間距相同。",
      "只在相鄰原值之間按實際月份間距等分總差額，不外推、不按月複利。",
      "原圖庫中的其他圖片供查閱，不代表已全部轉錄成日度或月度數據。",
      "不借用香港的士交易所 HKTEx 的任何價格補入 HK 原圖來源，也不混入成交個案或日度系列。",
      "estimated 是使用者指定方法的推算，不是新增市場觀察、成交價或收益預測。"
    ]
  },
  "series": [
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      "unitDisplay": "原圖數值（未註單位）",
      "start": "2015-01",
      "end": "2025-10",
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