{
  "metadata": {
    "dataset_name": "PRISM",
    "version": "1.1.0",
    "total_frames": 48792,
    "description": "Frame-level classification labels for the PRISM dataset. Labels cover weather condition, road type, surface material, and surface state. For folders with homogeneous surfaces, only default_label is provided. For folders with surface transitions, ordered_segments lists each contiguous segment in chronological order. Short transition zones are excluded with exact timestamp boundaries.",
    "label_usage": {
      "step_1": "If frame timestamp t falls within any timestamp_override [ts_start, ts_end], use that override's label.",
      "step_2": "Otherwise, if ordered_segments exists, determine the segment by cumulative frame_count offsets.",
      "step_3": "Otherwise, use default_label."
    },
    "timestamp_unit": "Unix seconds with millisecond precision (e.g., 1770704845.634)",
    "normalization_notes": {
      "surface_material": "'ahsphalt' typo corrected to 'asphalt'; 'beigian' typo corrected to 'belgian_block'",
      "surface_state": "'snow covered' normalized to 'snow_covered'"
    }
  },
  "class_definitions": {
    "weather": {
      "clear": "No precipitation, good visibility",
      "overcast": "Cloudy sky, no precipitation",
      "rainy": "Active rainfall during collection",
      "snowy": "Active snowfall during collection",
      "foggy": "Reduced visibility due to fog"
    },
    "road_type": {
      "urban": "City roads with intersections and traffic control",
      "highway": "High-speed limited-access roads",
      "rural": "Country roads outside urban areas",
      "proving_ground": "Controlled test facility with specialty road profiles"
    },
    "surface_material": {
      "asphalt": "Standard asphalt (bituminous) pavement",
      "concrete": "Portland cement concrete pavement",
      "belgian_block": "Cobblestone or interlocking paving block surface",
      "gravel": "Loose gravel road surface",
      "other": "Other surface types such as plastic speed bumps"
    },
    "surface_state": {
      "dry": "No moisture present on the surface",
      "damp": "Slight surface moisture with no standing water",
      "wet": "Wet surface; standing water or active rain film possible",
      "slush": "Partially melted snow or slush layer",
      "snow_covered": "Surface covered by compacted or fresh snow"
    }
  },
  "folders": {
    "0106_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1767667361_605",
          "ts_end": "1767667454_496",
          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "dry"
          }
        }
      ]
    },
    "0112_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1768200916_088",
          "ts_end": "1768200990_782",
          "label": {
            "weather": "snowy",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "snow_covered"
          }
        }
      ]
    },
    "0119_1_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1768791654_524",
          "ts_end": "1768791736_119",
          "label": {
            "weather": "overcast",
            "road_type": "highway",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0119_2_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1768791794_516",
          "ts_end": "1768791886_309",
          "label": {
            "weather": "overcast",
            "road_type": "highway",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0120_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1768891166_060",
          "ts_end": "1768891424_644",
          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "dry"
          }
        }
      ]
    },
    "0124_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1769223059_386",
          "ts_end": "1769223287_575",
          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "slush"
          }
        }
      ]
    },
    "0128_1_dataset": {
      "ordered_segments": [],
      "ignored_frames": [
        {
          "ts_start": "1769586554_508",
          "ts_end": "1769586600_597"
        }
      ]
    },
    "0128_2_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1769586754_988",
          "ts_end": "1769586792_586",
          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "concrete",
            "surface_state": "snow_covered"
          }
        }
      ],
      "ignored_frames": [
        {
          "ts_start": "1769586743_507",
          "ts_end": "1769586754_888"
        }
      ]
    },
    "0128_3_dataset": {
      "ordered_segments": [
        {
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          "ts_end": "1769587148_464",
          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "concrete",
            "surface_state": "damp"
          }
        }
      ],
      "ignored_frames": [
        {
          "ts_start": "1769587094_478",
          "ts_end": "1769587101_067"
        }
      ]
    },
    "0128_4_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1769587667_132",
          "ts_end": "1769587750_327",
          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "other",
            "surface_state": "damp"
          }
        }
      ],
      "ignored_frames": [
        {
          "ts_start": "1769587645_534",
          "ts_end": "1769587667_032"
        }
      ]
    },
    "0128_5_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1769587935_817",
          "ts_end": "1769587949_517",
          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "belgian_block",
            "surface_state": "snow_covered"
          }
        },
        {
          "ts_start": "1769587950_316",
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          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "belgian_block",
            "surface_state": "damp"
          }
        },
        {
          "ts_start": "1769587997_213",
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          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "belgian_block",
            "surface_state": "damp"
          }
        }
      ],
      "ignored_frames": [
        {
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        },
        {
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        {
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      ]
    },
    "0128_6_dataset": {
      "ordered_segments": [
        {
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          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "concrete",
            "surface_state": "wet"
          }
        }
      ],
      "ignored_frames": [
        {
          "ts_start": "1769588174_420",
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        }
      ]
    },
    "0128_7_dataset": {
      "ordered_segments": [
        {
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          "label": {
            "weather": "clear",
            "road_type": "proving_ground",
            "surface_material": "other",
            "surface_state": "damp"
          }
        }
      ],
      "ignored_frames": [
        {
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        }
      ]
    },
    "0129_1_dataset": {
      "ordered_segments": [
        {
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          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0129_2_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1769665006_799",
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          "label": {
            "weather": "clear",
            "road_type": "highway",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0129_3_dataset": {
      "ordered_segments": [
        {
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          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0129_4_dataset": {
      "ordered_segments": [
        {
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          "ts_end": "1769667794_523",
          "label": {
            "weather": "clear",
            "road_type": "rural",
            "surface_material": "asphalt",
            "surface_state": "damp"
          }
        }
      ]
    },
    "0202_dataset": {
      "ordered_segments": [
        {
          "ts_start": "1770014831_301",
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          "label": {
            "weather": "clear",
            "road_type": "urban",
            "surface_material": "asphalt",
            "surface_state": "slush"
          }
        }
      ]
    },
    "0210_1_dataset": {
      "ordered_segments": [
        {
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          "label": {
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            "surface_state": "damp"
          }
        },
        {
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          "label": {
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            "surface_state": "damp"
          }
        }
      ],
      "ignored_frames": [
        {
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      ]
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      "ordered_segments": [
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          "label": {
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          "label": {
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          }
        }
      ],
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          "label": {
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            "road_type": "highway",
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          }
        }
      ]
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      "ordered_segments": [
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          "label": {
            "weather": "foggy",
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            "surface_state": "dry"
          }
        }
      ]
    },
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      "ordered_segments": [
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          "label": {
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          }
        }
      ]
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          "label": {
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          }
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      ]
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          "label": {
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      ]
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