{
 "ocl_version": "0.1.0",
 "name": "Rerwick Road",
 "slug": "rerwick-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.44937265818706,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2414.0,
   "end_distance_m": 2416.0,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 34.877440950947495,
   "min_gradient_pct": -48.02107942466165,
   "suppressed_max_gradient_pct": 58.257090171913006,
   "suppressed_location_m": [
    2775.0,
    2777.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.038873421486187,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2414.0,
   "end_distance_m": 2417.0,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 35.03961970042834,
   "min_gradient_pct": -43.95740219928044,
   "suppressed_max_gradient_pct": 57.364602394883235,
   "suppressed_location_m": [
    2774.0,
    2777.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.081807266593785,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2414.0,
   "end_distance_m": 2419.0,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 35.33254386111344,
   "min_gradient_pct": -38.20300986416271,
   "suppressed_max_gradient_pct": 29.340678024475295,
   "suppressed_location_m": [
    2774.0,
    2779.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 17.330607660419872,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 3872.0,
   "end_distance_m": 3882.0,
   "start_elevation_m": 92.68424487385418,
   "end_elevation_m": 94.41730563989617,
   "min_gradient_pct": -31.266721436136464,
   "suppressed_max_gradient_pct": 17.636054829791377,
   "suppressed_location_m": [
    2774.0,
    2784.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.35859237141709,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3917.0,
   "end_distance_m": 3937.0,
   "start_elevation_m": 99.22200586706899,
   "end_elevation_m": 102.4937243413524,
   "min_gradient_pct": -16.40806916177123
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.22767261968903,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3915.0,
   "end_distance_m": 3940.0,
   "start_elevation_m": 98.8650229230871,
   "end_elevation_m": 102.92194107800935,
   "min_gradient_pct": -12.990001684880527
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.041882963952787,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3904.0,
   "end_distance_m": 3954.0,
   "start_elevation_m": 97.32024404661303,
   "end_elevation_m": 104.84118552858942,
   "min_gradient_pct": -8.33058187635936
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.554261982030098,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3867.0,
   "end_distance_m": 3967.0,
   "start_elevation_m": 91.98551762811694,
   "end_elevation_m": 106.53977961014704,
   "min_gradient_pct": -5.606480692923412
  }
 ],
 "shape": {
  "ascent_concentration": 0.447,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 167.0,
  "shape_class": "sustained"
 },
 "length_m": 5777.754956882597,
 "start_elevation_m": 35.52463325385133,
 "end_elevation_m": 193.32942840987013,
 "endpoint_gain_m": 157.8047951560188,
 "overall_gradient_pct": 2.7312476270396,
 "accumulated_ascent_m": 231.60776394347369,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.081807266593785,
   "start_distance_m": 2414.0,
   "end_distance_m": 2419.0,
   "midpoint_distance_m": 2416.5,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 35.33254386111344,
   "start_xy": [
    437598.58499499154,
    1118776.0063066073
   ],
   "end_xy": [
    437596.6254839611,
    1118771.406272203
   ]
  },
  "max_10m": {
   "gradient_pct": 17.330607660419872,
   "start_distance_m": 3872.0,
   "end_distance_m": 3882.0,
   "midpoint_distance_m": 3877.0,
   "start_elevation_m": 92.68424487385418,
   "end_elevation_m": 94.41730563989617,
   "start_xy": [
    437888.6644522702,
    1118291.2233217908
   ],
   "end_xy": [
    437890.53931088134,
    1118301.0459948073
   ]
  },
  "max_20m": {
   "gradient_pct": 16.35859237141709,
   "start_distance_m": 3917.0,
   "end_distance_m": 3937.0,
   "midpoint_distance_m": 3927.0,
   "start_elevation_m": 99.22200586706899,
   "end_elevation_m": 102.4937243413524,
   "start_xy": [
    437897.10131602036,
    1118335.4253503648
   ],
   "end_xy": [
    437902.214950974,
    1118354.5996498514
   ]
  },
  "max_25m": {
   "gradient_pct": 16.22767261968903,
   "start_distance_m": 3915.0,
   "end_distance_m": 3940.0,
   "midpoint_distance_m": 3927.5,
   "start_elevation_m": 98.8650229230871,
   "end_elevation_m": 102.92194107800935,
   "start_xy": [
    437896.72634429816,
    1118333.4608157615
   ],
   "end_xy": [
    437903.5908961803,
    1118357.2655033339
   ]
  },
  "max_50m": {
   "gradient_pct": 15.041882963952787,
   "start_distance_m": 3904.0,
   "end_distance_m": 3954.0,
   "midpoint_distance_m": 3929.0,
   "start_elevation_m": 97.32024404661303,
   "end_elevation_m": 104.84118552858942,
   "start_xy": [
    437894.6639998259,
    1118322.6558754435
   ],
   "end_xy": [
    437910.6411820445,
    1118369.2881967619
   ]
  },
  "max_100m": {
   "gradient_pct": 14.554261982030098,
   "start_distance_m": 3867.0,
   "end_distance_m": 3967.0,
   "midpoint_distance_m": 3917.0,
   "start_elevation_m": 91.98551762811694,
   "end_elevation_m": 106.53977961014704,
   "start_xy": [
    437887.7270229646,
    1118286.3119852825
   ],
   "end_xy": [
    437918.97808706656,
    1118379.262965664
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -38.20300986416271,
   "start_distance_m": 2408.0,
   "end_distance_m": 2413.0,
   "midpoint_distance_m": 2410.5,
   "start_elevation_m": 36.11231121658922,
   "end_elevation_m": 34.202160723381084,
   "start_xy": [
    437600.936408228,
    1118781.5263478926
   ],
   "end_xy": [
    437598.9768971976,
    1118776.926313488
   ]
  },
  "min_10m": {
   "gradient_pct": -31.266721436136464,
   "start_distance_m": 2403.0,
   "end_distance_m": 2413.0,
   "midpoint_distance_m": 2408.0,
   "start_elevation_m": 37.32883286699473,
   "end_elevation_m": 34.202160723381084,
   "start_xy": [
    437602.6547229656,
    1118786.2186358687
   ],
   "end_xy": [
    437598.9768971976,
    1118776.926313488
   ]
  },
  "min_20m": {
   "gradient_pct": -16.40806916177123,
   "start_distance_m": 2394.0,
   "end_distance_m": 2414.0,
   "midpoint_distance_m": 2404.0,
   "start_elevation_m": 37.510067330138,
   "end_elevation_m": 34.228453497783754,
   "start_xy": [
    437605.5534979407,
    1118794.739029266
   ],
   "end_xy": [
    437598.58499499154,
    1118776.0063066073
   ]
  },
  "min_25m": {
   "gradient_pct": -12.990001684880527,
   "start_distance_m": 2388.0,
   "end_distance_m": 2413.0,
   "midpoint_distance_m": 2400.5,
   "start_elevation_m": 37.449661144601215,
   "end_elevation_m": 34.202160723381084,
   "start_xy": [
    437607.48601459083,
    1118800.4192915307
   ],
   "end_xy": [
    437598.9768971976,
    1118776.926313488
   ]
  },
  "min_50m": {
   "gradient_pct": -8.33058187635936,
   "start_distance_m": 2459.0,
   "end_distance_m": 2509.0,
   "midpoint_distance_m": 2484.0,
   "start_elevation_m": 36.99067604912621,
   "end_elevation_m": 32.82538511094653,
   "start_xy": [
    437586.1389420245,
    1118733.2221051503
   ],
   "end_xy": [
    437580.2272476353,
    1118683.57281644
   ]
  },
  "min_100m": {
   "gradient_pct": -5.606480692923412,
   "start_distance_m": 5626.0,
   "end_distance_m": 5726.0,
   "midpoint_distance_m": 5676.0,
   "start_elevation_m": 199.59597563423065,
   "end_elevation_m": 193.98949494130724,
   "start_xy": [
    438988.701469793,
    1119418.5798703267
   ],
   "end_xy": [
    439070.442121318,
    1119475.4956910515
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.44937265818706,
   "start_distance_m": 2414.0,
   "end_distance_m": 2416.0,
   "midpoint_distance_m": 2415.0,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 34.877440950947495,
   "start_xy": [
    437598.58499499154,
    1118776.0063066073
   ],
   "end_xy": [
    437597.80119057937,
    1118774.1662928455
   ]
  },
  "max_3m": {
   "gradient_pct": 27.038873421486187,
   "start_distance_m": 2414.0,
   "end_distance_m": 2417.0,
   "midpoint_distance_m": 2415.5,
   "start_elevation_m": 34.228453497783754,
   "end_elevation_m": 35.03961970042834,
   "start_xy": [
    437598.58499499154,
    1118776.0063066073
   ],
   "end_xy": [
    437597.40928837325,
    1118773.2462859647
   ]
  }
 },
 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.0,
   "obstruction_max_height_m": 1.35,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.003,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    2733.0,
    2738.0
   ],
   [
    2771.0,
    2779.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_start"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
   5.0,
   10.0,
   20.0,
   25.0,
   50.0,
   100.0
  ],
  "diagnostic_windows_m": [
   2.0,
   3.0
  ],
  "elevation_crs": "EPSG:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/scotland/phase-2/dtm/HU31.tif",
   "data/cache/scotland/phase-2/dtm/HU32.tif"
  ],
  "calculated_at": "2026-08-18T18:40:30+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/scotland-2026-08-14-roads.osm.pbf",
  "osm_snapshot": "2026-08-13T20:21:01Z",
  "elevation_provider": "Scottish Remote Sensing Portal (AWS Open Data, srsp-open-data)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Scottish Government, SEPA and partners; Crown copyright",
  "elevation_dataset": "Scottish Public Sector LiDAR Phase 2 1m",
  "elevation_tile_ids": [
   "HU31",
   "HU32"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.5% over 200 m (Terrain 50), gain 22.2 m over 3389 m way. EXTENDED by graph walk: +0 segment(s) at base, +4 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 2 overlapping proposal(s): discovered-lane-59-9579-1-3068, vanlop-road ADOPTED (Scotland launch 2026-08-18): big-gain."
 },
 "area": {
  "place": "Burn Geo",
  "county": "Shetland Islands"
 }
}