{
  "pdf_sha256": "c66e72620519c7930d24c46bbb7f547632a12cf017a286addc6d7bf52ee27b36",
  "frames": [
    {
      "file": "key_cctv_fig23.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 27,
      "figure": 23,
      "clip_points": [
        108.5999984741211,
        147.6199951171875,
        507.3900146484375,
        429.9700012207031
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": 0,
      "time_precision": "explicit corrected time in report",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "07aba34c021faf413cd5f7fe3f3b38893e39a7f11e8c6b9cdf1c163447524cb9"
    },
    {
      "file": "key_cctv_fig29.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 30,
      "figure": 29,
      "clip_points": [
        104.5,
        120.510009765625,
        503.2300109863281,
        402.4100036621094
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": 11,
      "time_precision": "explicit corrected time in report",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "abb9536f55175f1f94164a58a4fa0ca1094f198e4280e71aaf414b983c14e740"
    },
    {
      "file": "key_cctv_fig31.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 31,
      "figure": 31,
      "clip_points": [
        79.0,
        135.07000732421875,
        528.1799926757812,
        423.6199951171875
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": 13,
      "time_precision": "explicit corrected time in report",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "a1d3c3d37284aa85e00d0043fff3bb9033926b5938d2178c3123ca97cc028c82"
    },
    {
      "file": "key_cctv_fig33.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 32,
      "figure": 33,
      "clip_points": [
        73.9000015258789,
        120.50997924804688,
        536.5,
        412.739990234375
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": 14,
      "time_precision": "explicit corrected time in report",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "42b00fa799f052e5f2189fbd557e19f74edca8f520d4811f037bc2501d04a6b2"
    },
    {
      "file": "key_cctv_fig35.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 33,
      "figure": 35,
      "clip_points": [
        79.0,
        120.50997924804688,
        528.1900024414062,
        403.8599853515625
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": null,
      "time_precision": "sequence only; report caption does not provide an exact timestamp",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "4f399925adcbba11699c0f25403a2186c0b5ac450a0bcc231b450d2be179ea65"
    },
    {
      "file": "key_cctv_fig36.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 33,
      "figure": 36,
      "clip_points": [
        79.0,
        429.20001220703125,
        528.1700439453125,
        709.9500122070312
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": null,
      "time_precision": "sequence_only; Figure36 has no individual corrected timestamp",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "241708b38ea790735cef1f18086adc203ed5d181f7b838ff8ce65d73862abce5",
      "event_association": {
        "relative_seconds": 15,
        "clock": "01:29:24 EDT",
        "event": "Span20 collapsed",
        "source": "MIR25-40 Appendix C (printed226/PDF228)",
        "relation": "near the +15s event; association is not an exact timestamp for this extracted frame"
      }
    },
    {
      "file": "key_cctv_fig37.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 34,
      "figure": 37,
      "clip_points": [
        79.0,
        91.40000915527344,
        528.1700439453125,
        374.20001220703125
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": null,
      "time_precision": "sequence only; report caption does not provide an exact timestamp",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "882f8ace4456f151884bc884ddde8fd90c609cc8980a15cf4c18a3829b0f520b"
    },
    {
      "file": "key_cctv_fig38.png",
      "source_pdf": "bridge_protection_factual.pdf",
      "pdf_page": 34,
      "figure": 38,
      "clip_points": [
        79.0,
        427.70001220703125,
        528.1300048828125,
        708.9000244140625
      ],
      "scale": 2.5,
      "view": "NRP FLIR camera",
      "corrected_relative_seconds": null,
      "time_precision": "sequence only; report caption does not provide an exact timestamp",
      "identity": "Original surveillance frame, reproduced in NTSB factual report; grayscale is thermal imaging, not fire",
      "sha256": "656fb78826ec234840c7e19767eb653042876563a905ae03ede1c82ae0769140"
    }
  ]
}