| {"_id": {"$oid": "6a3c000913ca88813b61c289"}, "name": "KITScenes-LongTail", "slug": "kitscenes-longtail", "version": "1.18.0", "created_at": {"$date": "2026-06-24T16:04:25.964Z"}, "last_modified_at": {"$date": "2026-06-24T18:04:08.846Z"}, "last_deletion_at": null, "last_loaded_at": {"$date": "2026-06-24T18:17:50.561Z"}, "sample_collection_name": "samples.6a3c000913ca88813b61c289", "frame_collection_name": "frames.samples.6a3c000913ca88813b61c289", "persistent": true, "media_type": "group", "group_field": "group", "group_media_types": {"front_left": "video", "front": "video", "front_right": "video", "rear_left": "video", "rear": "video", "rear_right": "video", "surround": "video", "threed": "3d"}, "default_group_slice": "front", "tags": [], "info": {"camera_parameters": {"front_left": {"K": [[1844.0, 0.0, 1764.0], [0.0, 1844.0, 1131.0], [0.0, 0.0, 1.0]], "R": [[0.87490947, -0.48422726, 0.00757555], [0.00382071, -0.00874058, -0.9999545], [0.48427144, 0.87489861, -0.00579713]], "t": [-0.00990917, -0.18619818, -0.19092926], "fx": 1844.0, "fy": 1844.0, "cx": 1764.0, "cy": 1131.0}, "front": {"K": [[1841.0, 0.0, 1765.0], [0.0, 1841.0, 1139.0], [0.0, 0.0, 1.0]], "R": [[0.01709344, -0.99983669, 0.00586657], [0.00538969, -0.0057752, -0.9999688], [0.99983937, 0.01712452, 0.00529009]], "t": [-0.0183397, -0.18646863, -0.20817565], "fx": 1841.0, "fy": 1841.0, "cx": 1765.0, "cy": 1139.0}, "front_right": {"K": [[1845.0, 0.0, 1749.0], [0.0, 1845.0, 1138.0], [0.0, 0.0, 1.0]], "R": [[-0.851906736, -0.523693303, 0.000485398655], [0.00104631263, -0.00262893385, -0.999995998], [0.523692486, -0.851902824, 0.00278755405]], "t": [-0.00863543, -0.18592461, -0.22478478], "fx": 1845.0, "fy": 1845.0, "cx": 1749.0, "cy": 1138.0}, "rear_left": {"K": [[1843.0, 0.0, 1769.0], [0.0, 1843.0, 1136.0], [0.0, 0.0, 1.0]], "R": [[0.85288016, 0.52210461, 0.00148434], [0.00680007, -0.00826537, -0.99994272], [-0.52206244, 0.85284141, -0.01059972]], "t": [0.00806251, -0.18614501, -0.18860823], "fx": 1843.0, "fy": 1843.0, "cx": 1769.0, "cy": 1136.0}, "rear": {"K": [[1845.0, 0.0, 1765.0], [0.0, 1845.0, 1135.0], [0.0, 0.0, 1.0]], "R": [[-0.0232531565, 0.999699927, -0.00770433147], [-0.000934666883, -0.00772815425, -0.999969706], [-0.999729168, -0.0232452442, 0.00111409296]], "t": [0.01893959, -0.18635925, -0.20259226], "fx": 1845.0, "fy": 1845.0, "cx": 1765.0, "cy": 1135.0}, "rear_right": {"K": [[1847.0, 0.0, 1756.0], [0.0, 1847.0, 1148.0], [0.0, 0.0, 1.0]], "R": [[-0.881148667, 0.472814031, 0.00489123238], [-0.00420872288, 0.00250132715, -0.999988016], [-0.472820592, -0.881158694, -0.000214095393]], "t": [0.01272224, -0.18561945, -0.22249366], "fx": 1847.0, "fy": 1847.0, "cx": 1756.0, "cy": 1148.0}}, "camera_parameters_note": "Pinhole K + extrinsics (R, t map ego->camera optical frame). Fixed rig; from the dataset card.", "provenance": {"verbatim_from_dataset": ["scenario_id", "driving_instruction", "scenario_type", "reasoning_{english,spanish,chinese} (all 9 fields)", "trajectory_bev (waypoint values; [-100,-100] placeholder futures dropped)", "video frames 1..n_observed (re-encoded from the dataset's real frames, downscaled; H.264)"], "derived": ["structural tags: camera, fps, n_observed_frames, n_future_frames, now_frame", "fps=5 Hz and the 4 s/5 s timing come from the PAPER (Table 2, Sec. 5.2), not the parquet (which has no timestamps)", "trajectory overlays (traj_*, past_trail, plan_cursor): projected with the card's camera K/R/t (verbatim) + ground_z=-1.6 m (our visual estimate) + estimated per-frame headings for the past trail", "driving_actions_{lang}: action labels/reasons are VERBATIM; their frame supports are derived (paper's 0-3 s / 3-5 s windows mapped onto the horizon)"], "constructed_or_synthetic": ["video frames n_observed+1.. : SYNTHETIC freeze of the last real frame (no future imagery exists in the dataset)", "qa_english_reconstructed / reasoning_cot_english_reconstructed: assembled from the paper's English question templates + VERBATIM answers (not raw dataset fields). Spanish/Chinese Q&A intentionally NOT generated."], "assumptions": {"ground_z_m": -1.6, "fps_hz": 5, "future_horizon": "synthetic freeze frames"}}, "timeline_note": "Each video = 5 Hz. Frames 1..n_observed are real observed imagery (~4 s past). 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