{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "$id": "https://huggingface.co/datasets/Ezharjan/WebCam254/resolve/main/captions_schema.json",
 "title": "WebCam254 frame record (WebDataset .json member, metadata.jsonl line, metadata/frames.parquet row)",
 "description": "Schema version 1.2.0. All paths are relative. Times are ISO 8601 (UTC with Z unless noted).",
 "type": "object",
 "required": [
  "file_name",
  "path",
  "camera_id",
  "camera_name",
  "frame_index",
  "caption",
  "time",
  "illumination",
  "camera_pose_overlay",
  "view",
  "image",
  "file_bytes",
  "file_bytes_equal_to_previous",
  "repeated_image_of",
  "flags",
  "condition_estimates",
  "visual_check"
 ],
 "properties": {
  "file_name": {
   "type": "string",
   "description": "image path relative to the camera folder, e.g. frames/20260825_232331_00001.jpg"
  },
  "path": {
   "type": "string",
   "description": "image path relative to the dataset root of the unpacked edition: <camera_id>/<file_name>"
  },
  "camera_id": {
   "type": "string"
  },
  "camera_name": {
   "type": "string"
  },
  "frame_index": {
   "type": "integer",
   "minimum": 1,
   "maximum": 2160,
   "description": "running request index NNNNN from the file name"
  },
  "caption": {
   "type": "string",
   "description": "systematic caption (see README.md)"
  },
  "time": {
   "type": "object",
   "properties": {
    "request_utc": {
     "type": [
      "string",
      "null"
     ]
    },
    "download_completed_utc": {
     "type": [
      "string",
      "null"
     ]
    },
    "overlay_exposure_utc": {
     "type": [
      "string",
      "null"
     ]
    },
    "image_time_utc": {
     "type": [
      "string",
      "null"
     ]
    },
    "image_time_source": {
     "enum": [
      "overlay_clock_ocr",
      "capture_request_time"
     ]
    },
    "local_time": {
     "type": [
      "string",
      "null"
     ]
    },
    "timezone": {
     "type": [
      "string",
      "null"
     ]
    },
    "utc_offset": {
     "type": [
      "string",
      "null"
     ]
    }
   }
  },
  "illumination": {
   "type": "object",
   "properties": {
    "light_phase": {
     "enum": [
      "day",
      "low_sun",
      "civil_twilight",
      "nautical_twilight",
      "astronomical_twilight",
      "night"
     ]
    },
    "day_period": {
     "enum": [
      "morning",
      "evening",
      null
     ]
    },
    "sun_altitude_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "sun_azimuth_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "moon_altitude_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "moon_azimuth_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "moon_illuminated_fraction": {
     "type": [
      "number",
      "null"
     ]
    },
    "moon_phase": {
     "type": [
      "string",
      "null"
     ]
    },
    "lunar_eclipse_phase": {
     "enum": [
      "penumbral",
      "partial_umbral",
      null
     ]
    }
   }
  },
  "camera_pose_overlay": {
   "type": [
    "object",
    "null"
   ],
   "properties": {
    "pan_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "tilt_deg": {
     "type": [
      "number",
      "null"
     ]
    },
    "zoom": {
     "type": [
      "number",
      "null"
     ]
    },
    "ocr_confidence": {
     "type": [
      "number",
      "null"
     ]
    },
    "fields_read": {
     "type": "array",
     "items": {
      "type": [
       "string",
       "null"
      ]
     }
    }
   }
  },
  "view": {
   "type": "object",
   "properties": {
    "view_id": {
     "type": [
      "string",
      "null"
     ]
    },
    "assignment": {
     "enum": [
      "visually_verified_frame",
      "overlay_ptz_match",
      "overlay_ptz_near_match",
      "temporal_interpolation",
      "image_segment_with_anchor",
      "image_template_match",
      "image_embedding_match",
      "image_embedding_cluster",
      "single_view_camera",
      "unassigned"
     ]
    },
    "short_description": {
     "type": [
      "string",
      "null"
     ]
    },
    "template_correlation": {
     "type": [
      "number",
      "null"
     ]
    }
   }
  },
  "image": {
   "type": "object",
   "properties": {
    "width": {
     "type": [
      "integer",
      "null"
     ]
    },
    "height": {
     "type": [
      "integer",
      "null"
     ]
    },
    "md5": {
     "type": [
      "string",
      "null"
     ]
    },
    "mode": {
     "enum": [
      "colour",
      "monochrome",
      "black",
      "undecodable"
     ]
    },
    "exposure": {
     "enum": [
      "normal",
      "very_dark",
      "overexposed",
      null
     ]
    },
    "luma_mean": {
     "type": [
      "number",
      "null"
     ]
    },
    "luma_std": {
     "type": [
      "number",
      "null"
     ]
    },
    "luma_p02": {
     "type": [
      "number",
      "null"
     ]
    },
    "luma_p50": {
     "type": [
      "number",
      "null"
     ]
    },
    "luma_p98": {
     "type": [
      "number",
      "null"
     ]
    },
    "frac_dark": {
     "type": [
      "number",
      "null"
     ]
    },
    "frac_clipped": {
     "type": [
      "number",
      "null"
     ]
    },
    "rgb_mean": {
     "type": "array",
     "items": {
      "type": [
       "number",
       "null"
      ]
     }
    },
    "chroma_mean": {
     "type": [
      "number",
      "null"
     ]
    },
    "colorfulness": {
     "type": [
      "number",
      "null"
     ]
    },
    "sharpness": {
     "type": [
      "number",
      "null"
     ]
    },
    "luma_thirds": {
     "type": "array",
     "items": {
      "type": [
       "number",
       "null"
      ]
     }
    },
    "dhash": {
     "type": [
      "string",
      "null"
     ]
    },
    "mean_abs_diff_prev": {
     "type": [
      "number",
      "null"
     ]
    },
    "identical_to_previous": {
     "type": [
      "boolean",
      "null"
     ]
    }
   }
  },
  "file_bytes": {
   "type": [
    "integer",
    "null"
   ]
  },
  "file_bytes_equal_to_previous": {
   "type": [
    "boolean",
    "null"
   ]
  },
  "repeated_image_of": {
   "type": [
    "string",
    "null"
   ],
   "description": "path of an earlier frame with byte-identical content, else null"
  },
  "flags": {
   "type": "array",
   "items": {
    "type": [
     "string",
     "null"
    ]
   }
  },
  "condition_estimates": {
   "type": [
    "object",
    "null"
   ],
   "properties": {
    "cloud_cover": {
     "enum": [
      "clear_or_few_clouds",
      "partly_cloudy",
      "mostly_cloudy_or_overcast",
      null
     ]
    },
    "cloud_cover_probabilities": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "clear_or_few_clouds": {
       "type": [
        "number",
        "null"
       ]
      },
      "partly_cloudy": {
       "type": [
        "number",
        "null"
       ]
      },
      "mostly_cloudy_or_overcast": {
       "type": [
        "number",
        "null"
       ]
      }
     }
    },
    "sun_glare_or_flare": {
     "type": [
      "boolean",
      "null"
     ]
    },
    "sun_glare_or_flare_probability": {
     "type": [
      "number",
      "null"
     ]
    }
   },
   "description": "machine estimates (CLIP ViT-L/14 probes); null outside the domain (colour, sun above the horizon, not repeated)"
  },
  "visual_check": {
   "type": [
    "object",
    "null"
   ],
   "properties": {
    "caption": {
     "type": [
      "string",
      "null"
     ]
    },
    "sky_condition": {
     "type": [
      "string",
      "null"
     ]
    },
    "sun_visible": {
     "type": [
      "boolean",
      "null"
     ]
    },
    "moon_visible": {
     "type": [
      "boolean",
      "null"
     ]
    },
    "smoke_plume": {
     "type": [
      "boolean",
      "null"
     ]
    },
    "image_mode": {
     "type": [
      "string",
      "null"
     ]
    },
    "issues": {
     "type": "array",
     "items": {
      "type": [
       "string",
       "null"
      ]
     }
    },
    "source": {
     "enum": [
      "contact_sheet_tile",
      "ptz_state_check",
      "unassigned_cluster_check",
      "condition_label_sample"
     ]
    },
    "labels": {
     "type": [
      "object",
      "null"
     ],
     "properties": {
      "sky_visible": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "cloud_cover": {
       "type": [
        "string",
        "null"
       ]
      },
      "fog_low_cloud": {
       "type": [
        "string",
        "null"
       ]
      },
      "haze": {
       "type": [
        "string",
        "null"
       ]
      },
      "smoke_plume": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "precipitation_visible": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sun_glare_or_flare": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "lens_contamination": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "obstruction": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "snow_on_ground": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "confidence": {
       "type": [
        "string",
        "null"
       ]
      }
     }
    }
   },
   "description": "observations for individually inspected frames, else null; labels only for source condition_label_sample"
  }
 },
 "$defs": {
  "captions_json": {
   "description": "captions.json",
   "type": "object",
   "required": [
    "schema_version",
    "dataset",
    "paths",
    "num_cameras",
    "num_frames",
    "cameras"
   ],
   "properties": {
    "schema_version": {
     "type": "string"
    },
    "dataset": {
     "const": "WebCam254"
    },
    "paths": {
     "type": "string"
    },
    "num_cameras": {
     "const": 254
    },
    "num_frames": {
     "const": 548376
    },
    "cameras": {
     "type": "array",
     "items": {
      "type": "object",
      "properties": {
       "camera_id": {
        "type": "string"
       },
       "camera_name": {
        "type": "string"
       },
       "network": {
        "type": "string"
       },
       "directory": {
        "type": "string"
       },
       "site_summary": {
        "type": "string"
       },
       "frame_count": {
        "type": "integer"
       },
       "frames": {
        "type": "array",
        "items": {
         "type": "object",
         "required": [
          "file_name",
          "image_time_utc",
          "local_time",
          "light_phase",
          "view_id",
          "caption"
         ],
         "properties": {
          "file_name": {
           "type": "string",
           "description": "relative to the dataset root: <camera_id>/frames/..."
          },
          "image_time_utc": {
           "type": "string"
          },
          "local_time": {
           "type": "string"
          },
          "light_phase": {
           "type": "string"
          },
          "view_id": {
           "type": [
            "string",
            "null"
           ]
          },
          "caption": {
           "type": "string"
          },
          "visual_caption": {
           "type": "string"
          }
         }
        }
       }
      }
     }
    }
   }
  },
  "cameras_json": {
   "description": "cameras.json",
   "type": "object",
   "required": [
    "schema_version",
    "dataset",
    "num_cameras",
    "cameras"
   ],
   "properties": {
    "schema_version": {
     "type": "string"
    },
    "dataset": {
     "const": "WebCam254"
    },
    "num_cameras": {
     "const": 254
    },
    "cameras": {
     "type": "array",
     "minItems": 254,
     "maxItems": 254,
     "items": {
      "type": "object",
      "properties": {
       "camera_id": {
        "type": "string"
       },
       "camera_name": {
        "type": "string"
       },
       "camera_name_full": {
        "type": "string"
       },
       "network": {
        "type": "string"
       },
       "site_partner_tag": {
        "type": [
         "string",
         "null"
        ]
       },
       "directory": {
        "type": "string"
       },
       "frames_directory": {
        "type": "string"
       },
       "image_url": {
        "type": "string"
       },
       "latitude": {
        "type": "number"
       },
       "longitude": {
        "type": "number"
       },
       "timezone": {
        "type": "string"
       },
       "capture": {
        "type": "object",
        "properties": {
         "session_start_utc": {
          "type": "string"
         },
         "session_end_utc": {
          "type": "string"
         },
         "interval_s": {
          "type": "number"
         },
         "planned_duration_s": {
          "type": "number"
         },
         "scheduled_slots": {
          "type": "integer"
         },
         "requests_skipped_overrun": {
          "type": "integer"
         },
         "frames_ok": {
          "type": "integer"
         },
         "requests_failed": {
          "type": "integer"
         },
         "failed_requests": {
          "type": "array"
         }
        }
       },
       "scene": {
        "type": "object",
        "properties": {
         "site_summary": {
          "type": "string"
         },
         "overlay": {
          "type": "object"
         },
         "privacy_masks": {
          "type": "boolean"
         },
         "night_imaging": {
          "type": "string"
         },
         "views": {
          "type": "array",
          "items": {
           "type": "object",
           "required": [
            "view_id",
            "description",
            "short_description",
            "frames"
           ],
           "properties": {
            "view_id": {
             "type": "string"
            },
            "description": {
             "type": "string"
            },
            "short_description": {
             "type": "string"
            },
            "horizon": {
             "type": "string"
            },
            "approx_sky_fraction": {
             "type": [
              "number",
              "null"
             ]
            },
            "land_cover": {
             "type": "array",
             "items": {
              "type": "string"
             }
            },
            "notable_objects": {
             "type": "array",
             "items": {
              "type": "string"
             }
            },
            "camera_hardware_in_view": {
             "type": [
              "boolean",
              "null"
             ]
            },
            "determinable": {
             "type": "boolean"
            },
            "tiles": {
             "type": "array",
             "items": {
              "type": "integer"
             }
            },
            "merged_view_ids": {
             "type": "array",
             "items": {
              "type": "string"
             }
            },
            "frames": {
             "type": "integer"
            }
           }
          }
         },
         "reviewed_tiles": {
          "type": "array",
          "items": {
           "type": "object",
           "properties": {
            "tile": {
             "type": "integer"
            },
            "file_name": {
             "type": "string"
            },
            "view_id": {
             "type": [
              "string",
              "null"
             ]
            }
           }
          }
         },
         "unassigned_frames": {
          "type": "integer"
         },
         "reviewer_notes": {
          "type": "string"
         }
        }
       },
       "overlay_ptz_available": {
        "type": "boolean"
       },
       "overlay_ptz_used_for_view_assignment": {
        "type": "boolean"
       },
       "light_phase_counts": {
        "type": "object"
       }
      }
     }
    }
   }
  }
 }
}