WebCam254 / captions_schema.json
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{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$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"
}
}
}
}
}
}
}
}