{
  "schema_version": "0.3",
  "scene_id": "aligned_flow.af_0001",
  "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": "1971-03-27T20:37:55.004608Z",
    "end": "1971-03-27T20:38:05.004608Z",
    "duration_s": 10.0
  },
  "tracking": {
    "tracking_id": "aligned_flow.af_0001",
    "format": "csv",
    "path": "../tracks/aligned_flow.af_0001.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": {
    "p_star": [
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      7.887806931702238
    ],
    "u_hat": [
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      -0.9991807009158552
    ]
  },
  "metadata": {
    "task_type": "aligned_flow",
    "description": "Aligned-flow benchmark scene exported from mined human candidate af_0001.",
    "score": 2.899087807144315,
    "rerank_score": 5.59776441786927,
    "alignment_signed": 0.9994623258118918,
    "crowd_coherence": 0.8407275395494311,
    "crowd_local_density": 16.0,
    "difficulty_score_raw": 0.6147744604014163,
    "difficulty_score_norm": 0.1622682802334855,
    "difficulty_category": "easy",
    "difficulty_rank_within_category": 20,
    "heading_diff_deg": 1.8789563244824024,
    "subject_displacement_m": 3.591667788770459,
    "subject_duration_s": 9.900782,
    "crowd_n_other_tracks": 8,
    "crowd_n_samples": 549
  },
  "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_1971-03-27T00:00:00Z_1971-03-28T00:00:00Z/by_chunks/chunk_1971-03-27T20_35_00Z_1971-03-27T20_40_00Z.csv",
      "person_track_id": "898df0e135d1",
      "window_start": "1971-03-27T20:37:55.004608+00:00",
      "window_end": "1971-03-27T20:38:05.004608+00:00",
      "candidates_csv": "out/af_clean/s2016_alignedflow_humans_with_difficulty.csv"
    }
  }
}