{
  "version": 1,
  "split": "val",
  "n_pairs": 4,
  "pairs": [
    {
      "pair_id": "delhi_0009",
      "before_path": "library_sources/2019/sentinel2_delhi_r1231_c7957.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1231_c7957.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0009.png",
      "change_types": [
        "mixed_gsd",
        "vegetation"
      ],
      "notes": "Sentinel-2 L2A TCI, 10m GSD \u2014 coarse resolution, NOT reliable for individual building/road detail. Real Delhi coordinates/dates. GT mask still needs hand-labeling. Day 2 review: real change visually confirmed but automated mask under-captures the extent \u2014 needs manual polygon redraw, not yet promoted. Retried with stronger morphological merge \u2014 still doesn't align with the visible real change, needs manual polygon redraw. Day 3: hand-traced polygon around the color-distinctive bare-earth/staging patch that disappeared \u2014 replaced automated candidate.",
      "change_frac": 0.0235
    },
    {
      "pair_id": "delhi_0029",
      "before_path": "library_sources/2019/sentinel2_delhi_r2731_c9157.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r2731_c9157.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0029.png",
      "change_types": [
        "mixed_gsd",
        "vegetation"
      ],
      "notes": "Sentinel-2 L2A TCI, 10m GSD \u2014 coarse resolution, NOT reliable for individual building/road detail. Real Delhi coordinates/dates. GT mask still needs hand-labeling. Day 2 review: appears seasonal/crop-texture noise dominated, no clear structural change spotted at thumbnail resolution \u2014 needs a closer manual look before labeling.",
      "change_frac": 0.041322222222222225
    },
    {
      "pair_id": "delhi_0018",
      "before_path": "library_sources/2019/sentinel2_delhi_r4531_c8257.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r4531_c8257.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0018.png",
      "change_types": [
        "mixed_gsd",
        "vegetation"
      ],
      "notes": "Sentinel-2 L2A TCI, 10m GSD \u2014 coarse resolution, NOT reliable for individual building/road detail. Real Delhi coordinates/dates. GT mask still needs hand-labeling.",
      "change_frac": 0.05095555555555555
    },
    {
      "pair_id": "delhi_0003",
      "before_path": "library_sources/2019/sentinel2_delhi_r4531_c9157.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r4531_c9157.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0003.png",
      "change_types": [
        "mixed_gsd",
        "vegetation"
      ],
      "notes": "Sentinel-2 L2A TCI, 10m GSD \u2014 coarse resolution, NOT reliable for individual building/road detail. Real Delhi coordinates/dates. GT mask still needs hand-labeling. Day 2 review: real change visually confirmed but automated mask under-captures the extent \u2014 needs manual polygon redraw, not yet promoted.",
      "change_frac": 0.08271111111111111
    }
  ]
}