{
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  "scene_id": "aligned_flow.af_0039",
  "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."
  },
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    "start": "1971-03-10T03:58:25.020826Z",
    "end": "1971-03-10T03:58:35.020826Z",
    "duration_s": 10.0
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  "tracking": {
    "tracking_id": "aligned_flow.af_0039",
    "format": "csv",
    "path": "../tracks/aligned_flow.af_0039.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."
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  "metadata": {
    "task_type": "aligned_flow",
    "description": "Aligned-flow benchmark scene exported from mined human candidate af_0039.",
    "score": 3.047656712301273,
    "rerank_score": 5.590285500318643,
    "alignment_signed": 0.9997262547421044,
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    "crowd_local_density": 46.08888888888889,
    "difficulty_score_raw": 0.8128773023605464,
    "difficulty_score_norm": 0.6947168181082399,
    "difficulty_category": "medium",
    "difficulty_rank_within_category": 2,
    "heading_diff_deg": 1.3406667551752776,
    "subject_displacement_m": 9.088795120950133,
    "subject_duration_s": 8.90074,
    "crowd_n_other_tracks": 6,
    "crowd_n_samples": 563
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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_1971-03-10T00:00:00Z_1971-03-11T00:00:00Z/by_chunks/chunk_1971-03-10T03_55_00Z_1971-03-10T04_00_00Z.csv",
      "person_track_id": "6c02874b46ed",
      "window_start": "1971-03-10T03:58:25.020826+00:00",
      "window_end": "1971-03-10T03:58:35.020826+00:00",
      "candidates_csv": "out/af_clean/s2016_alignedflow_humans_with_difficulty.csv"
    }
  }
}