{
  "schema_version": "0.3",
  "scene_id": "aligned_flow.af_0021",
  "layout": {
    "layout_id": "research.sc.s2016",
    "path": "../layouts/s2016.layout.simplified.json",
    "coordinate_frame": "layout_xy_meters",
    "notes": "Scene geometry is expressed in the referenced layout frame."
  },
  "window": {
    "start": "1971-03-28T21:09:20.019173Z",
    "end": "1971-03-28T21:09:30.019173Z",
    "duration_s": 10.0
  },
  "tracking": {
    "tracking_id": "aligned_flow.af_0021",
    "format": "csv",
    "path": "../tracks/aligned_flow.af_0021.tracks.csv",
    "timestamp_field": "timestamp",
    "track_id_field": "person_track_id",
    "coordinate_frame": "layout_xy_meters",
    "notes": "Windowed export from raw tracking chunk with all original columns preserved."
  },
  "flow": {
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    ],
    "u_hat": [
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    ]
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  "metadata": {
    "task_type": "aligned_flow",
    "description": "Aligned-flow benchmark scene exported from mined human candidate af_0021.",
    "score": 3.0767016352956604,
    "rerank_score": 5.693244546427781,
    "alignment_signed": 0.9994152801101114,
    "crowd_coherence": 0.8775787151304935,
    "crowd_local_density": 61.747368421052634,
    "difficulty_score_raw": 0.7927213681471894,
    "difficulty_score_norm": 0.6292725529957969,
    "difficulty_category": "medium",
    "difficulty_rank_within_category": 20,
    "heading_diff_deg": 1.9594434212177705,
    "subject_displacement_m": 9.287820373082322,
    "subject_duration_s": 9.400609,
    "crowd_n_other_tracks": 7,
    "crowd_n_samples": 660
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  "provenance": {
    "generator": {
      "name": "build_aligned_flow_benchmark",
      "version": "0.2.0"
    },
    "generated_at": null,
    "source": {
      "chunk_file": "/Volumes/EvenFlow/tracks/clean/sc.s2016/tracking_data_research.sc.s2016_1971-03-28T00:00:00Z_1971-03-29T00:00:00Z/by_chunks/chunk_1971-03-28T21_05_00Z_1971-03-28T21_10_00Z.csv",
      "person_track_id": "98b09390df08",
      "window_start": "1971-03-28T21:09:20.019173+00:00",
      "window_end": "1971-03-28T21:09:30.019173+00:00",
      "candidates_csv": "out/af_clean/s2016_alignedflow_humans_with_difficulty.csv"
    }
  }
}