{
  "version": 1,
  "split": "train",
  "n_pairs": 23,
  "pairs": [
    {
      "pair_id": "delhi_0032",
      "before_path": "library_sources/2019/sentinel2_delhi_r5131_c9157.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r5131_c9157.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0032.png",
      "change_types": [
        "mixed_gsd",
        "vegetation",
        "building"
      ],
      "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. Visually confirmed real new construction (Day 2 review) \u2014 coarse 10m precision only.",
      "change_frac": 0.03517777777777778
    },
    {
      "pair_id": "delhi_0028",
      "before_path": "library_sources/2019/sentinel2_delhi_r3931_c9457.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r3931_c9457.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0028.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": 0.0368
    },
    {
      "pair_id": "delhi_0025",
      "before_path": "library_sources/2019/sentinel2_delhi_r1531_c8857.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1531_c8857.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0025.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": 0.03724444444444444
    },
    {
      "pair_id": "delhi_0021",
      "before_path": "library_sources/2019/sentinel2_delhi_r1531_c8557.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1531_c8557.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0021.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": 0.038988888888888885
    },
    {
      "pair_id": "delhi_0011",
      "before_path": "library_sources/2019/sentinel2_delhi_r2731_c8257.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r2731_c8257.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0011.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": 0.044333333333333336
    },
    {
      "pair_id": "delhi_0019",
      "before_path": "library_sources/2019/sentinel2_delhi_r1831_c9457.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1831_c9457.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0019.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": 0.04778888888888889
    },
    {
      "pair_id": "delhi_0027",
      "before_path": "library_sources/2019/sentinel2_delhi_r1831_c8857.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1831_c8857.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0027.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": 0.04786666666666667
    },
    {
      "pair_id": "delhi_0023",
      "before_path": "library_sources/2019/sentinel2_delhi_r3931_c9157.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r3931_c9157.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0023.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": 0.04867777777777778
    },
    {
      "pair_id": "delhi_0022",
      "before_path": "library_sources/2019/sentinel2_delhi_r1231_c9457.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1231_c9457.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0022.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": 0.05095555555555555
    },
    {
      "pair_id": "delhi_0017",
      "before_path": "library_sources/2019/sentinel2_delhi_r1231_c8257.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1231_c8257.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0017.png",
      "change_types": [
        "mixed_gsd",
        "vegetation",
        "road"
      ],
      "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. Visually confirmed real road/highway construction (Day 2 review) \u2014 coarse 10m precision only.",
      "change_frac": 0.053344444444444444
    },
    {
      "pair_id": "delhi_0004",
      "before_path": "library_sources/2019/sentinel2_delhi_r3931_c9757.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r3931_c9757.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0004.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": 0.07601111111111111
    },
    {
      "pair_id": "delhi_0031",
      "before_path": "library_sources/2019/sentinel2_delhi_r4831_c9157.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r4831_c9157.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0031.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": 0.07603333333333333
    },
    {
      "pair_id": "delhi_0012",
      "before_path": "library_sources/2019/sentinel2_delhi_r2731_c8857.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r2731_c8857.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0012.png",
      "change_types": [
        "mixed_gsd",
        "vegetation",
        "road"
      ],
      "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. Visually confirmed real road/highway construction (Day 2 review) \u2014 coarse 10m precision only.",
      "change_frac": 0.08994444444444444
    },
    {
      "pair_id": "delhi_0026",
      "before_path": "library_sources/2019/sentinel2_delhi_r4231_c8557.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r4231_c8557.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0026.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": 0.09582222222222223
    },
    {
      "pair_id": "dda_before5_after5_v2",
      "before_path": "C:/Users/Priyanka/Downloads/before5 (1).tif",
      "after_path": "C:/Users/Priyanka/Downloads/after5 (1).tif",
      "gt_mask": "docs/delhi_eval/labels/dda_before5_after5_v2.png",
      "change_types": [
        "building",
        "road",
        "vegetation",
        "mixed"
      ],
      "notes": "Labeling pack. Paint docs/delhi_eval/dda_labeling/dda_before5_after5_v2/gt_mask.png then run scripts/ingest_dda_gt_label.py --pair-id dda_before5_after5_v2",
      "change_frac": 0.1190110318570675
    },
    {
      "pair_id": "dda_before6_after6_v2",
      "before_path": "C:/Users/Priyanka/Downloads/before6 (1).tif",
      "after_path": "C:/Users/Priyanka/Downloads/after6 (1).tif",
      "gt_mask": "docs/delhi_eval/labels/dda_before6_after6_v2.png",
      "change_types": [
        "building",
        "road",
        "vegetation",
        "mixed"
      ],
      "notes": "Labeling pack. Paint docs/delhi_eval/dda_labeling/dda_before6_after6_v2/gt_mask.png then run scripts/ingest_dda_gt_label.py --pair-id dda_before6_after6_v2",
      "change_frac": 0.21923341714559386
    },
    {
      "pair_id": "delhi_0030",
      "before_path": "library_sources/2019/sentinel2_delhi_r1531_c10057.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r1531_c10057.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0030.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-drawn rough polygon bounding the settlement expansion + new construction patch \u2014 replaced automated candidate which under-captured it.",
      "change_frac": 0.37924444444444444
    },
    {
      "pair_id": "delhi_0020",
      "before_path": "library_sources/2019/sentinel2_delhi_r2431_c8257.tif",
      "after_path": "library_sources/2026/sentinel2_delhi_r2431_c8257.tif",
      "gt_mask": "docs/delhi_eval/labels/delhi_0020.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-drawn rough polygon (per project GT tolerance) bounding the new road-grid/plot development visible in after \u2014 replaced automated candidate which under-captured it.",
      "change_frac": 0.48006666666666664
    },
    {
      "pair_id": "hn_delhi_0002",
      "before_path": "data/delhi_cd/hard_negatives/hn_delhi_0002_before.png",
      "after_path": "data/delhi_cd/hard_negatives/hn_delhi_0002_after.png",
      "gt_mask": "data/delhi_cd/hard_negatives/hn_delhi_0002_gt.png",
      "change_types": [
        "hard_negative",
        "vegetation_seasonal",
        "shadow"
      ],
      "notes": "Mined FP from delhi_0002 (fp_frac=0.038, tags=hard_negative,vegetation_seasonal,shadow) - restored after Friday split rebuild wiped it"
    },
    {
      "pair_id": "hn_delhi_0006",
      "before_path": "data/delhi_cd/hard_negatives/hn_delhi_0006_before.png",
      "after_path": "data/delhi_cd/hard_negatives/hn_delhi_0006_after.png",
      "gt_mask": "data/delhi_cd/hard_negatives/hn_delhi_0006_gt.png",
      "change_types": [
        "hard_negative",
        "vegetation_seasonal",
        "shadow"
      ],
      "notes": "Mined FP from delhi_0006 (fp_frac=0.036, tags=hard_negative,vegetation_seasonal,shadow) - restored after Friday split rebuild wiped it"
    },
    {
      "pair_id": "hn_delhi_0013",
      "before_path": "data/delhi_cd/hard_negatives/hn_delhi_0013_before.png",
      "after_path": "data/delhi_cd/hard_negatives/hn_delhi_0013_after.png",
      "gt_mask": "data/delhi_cd/hard_negatives/hn_delhi_0013_gt.png",
      "change_types": [
        "hard_negative",
        "vegetation_seasonal",
        "shadow"
      ],
      "notes": "Mined FP from delhi_0013 (fp_frac=0.069, tags=hard_negative,vegetation_seasonal,shadow) - restored after Friday split rebuild wiped it"
    },
    {
      "pair_id": "hn_delhi_0014",
      "before_path": "data/delhi_cd/hard_negatives/hn_delhi_0014_before.png",
      "after_path": "data/delhi_cd/hard_negatives/hn_delhi_0014_after.png",
      "gt_mask": "data/delhi_cd/hard_negatives/hn_delhi_0014_gt.png",
      "change_types": [
        "hard_negative",
        "vegetation_seasonal",
        "shadow"
      ],
      "notes": "Mined FP from delhi_0014 (fp_frac=0.101, tags=hard_negative,vegetation_seasonal,shadow) - restored after Friday split rebuild wiped it"
    },
    {
      "pair_id": "hn_delhi_0015",
      "before_path": "data/delhi_cd/hard_negatives/hn_delhi_0015_before.png",
      "after_path": "data/delhi_cd/hard_negatives/hn_delhi_0015_after.png",
      "gt_mask": "data/delhi_cd/hard_negatives/hn_delhi_0015_gt.png",
      "change_types": [
        "hard_negative",
        "vegetation_seasonal",
        "shadow"
      ],
      "notes": "Mined FP from delhi_0015 (fp_frac=0.036, tags=hard_negative,vegetation_seasonal,shadow) - restored after Friday split rebuild wiped it"
    }
  ]
}