{
 "ocl_version": "0.1.0",
 "name": "Lane near Abercych",
 "slug": "discovered-lane-52-0389-4-5574",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.33377414271607,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 506.0,
   "end_distance_m": 508.0,
   "start_elevation_m": 64.05433363131758,
   "end_elevation_m": 64.9810091141719,
   "min_gradient_pct": -13.533416850622615,
   "suppressed_max_gradient_pct": 64.46107533379433,
   "suppressed_location_m": [
    510.0,
    512.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.83762272347976,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 483.0,
   "end_distance_m": 486.0,
   "start_elevation_m": 58.60655579022463,
   "end_elevation_m": 59.891684471929025,
   "min_gradient_pct": -9.116554112655706,
   "suppressed_max_gradient_pct": 44.47201333477366,
   "suppressed_location_m": [
    307.0,
    310.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.71375543124262,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 483.0,
   "end_distance_m": 488.0,
   "start_elevation_m": 58.60655579022463,
   "end_elevation_m": 60.39224356178676,
   "min_gradient_pct": -5.663560392804641,
   "suppressed_max_gradient_pct": 40.48793844058821,
   "suppressed_location_m": [
    507.0,
    512.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.17654690658381,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 563.0,
   "end_distance_m": 573.0,
   "start_elevation_m": 73.0031454092807,
   "end_elevation_m": 75.92080009993909,
   "min_gradient_pct": -3.581560647810278,
   "suppressed_max_gradient_pct": 30.725549394739744,
   "suppressed_location_m": [
    502.0,
    512.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.812607259753953,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 468.0,
   "end_distance_m": 488.0,
   "start_elevation_m": 55.02972210983597,
   "end_elevation_m": 60.39224356178676,
   "min_gradient_pct": -1.5091041888904044,
   "suppressed_max_gradient_pct": 27.075569523920286,
   "suppressed_location_m": [
    492.0,
    512.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.266902330679073,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 462.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 53.58043161645766,
   "end_elevation_m": 60.14715719912743,
   "min_gradient_pct": -0.7085553910189901
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 24.670248394498245,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 447.0,
   "end_distance_m": 497.0,
   "start_elevation_m": 50.113914221753696,
   "end_elevation_m": 62.44903841900282,
   "min_gradient_pct": 0.10293921666661277,
   "suppressed_max_gradient_pct": 25.745320350970246,
   "suppressed_location_m": [
    462.0,
    512.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.871461007277148,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 408.0,
   "end_distance_m": 508.0,
   "start_elevation_m": 42.10954810689475,
   "end_elevation_m": 64.9810091141719,
   "min_gradient_pct": 2.4705180173714183,
   "suppressed_max_gradient_pct": 23.423236551764447,
   "suppressed_location_m": [
    412.0,
    512.0
   ]
  }
 ],
 "length_m": 683.8171911000953,
 "start_elevation_m": 10.07541389433351,
 "end_elevation_m": 82.69082779968144,
 "endpoint_gain_m": 72.61541390534794,
 "overall_gradient_pct": 10.619126697959643,
 "accumulated_ascent_m": 75.20230793018428,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.71375543124262,
   "start_distance_m": 483.0,
   "end_distance_m": 488.0,
   "midpoint_distance_m": 485.5,
   "start_elevation_m": 58.60655579022463,
   "end_elevation_m": 60.39224356178676,
   "start_xy": [
    224678.70694179914,
    240915.85199442762
   ],
   "end_xy": [
    224673.95076054952,
    240914.31490291507
   ]
  },
  "max_10m": {
   "gradient_pct": 29.17654690658381,
   "start_distance_m": 563.0,
   "end_distance_m": 573.0,
   "midpoint_distance_m": 568.0,
   "start_elevation_m": 73.0031454092807,
   "end_elevation_m": 75.92080009993909,
   "start_xy": [
    224611.73175962913,
    240876.37893051733
   ],
   "end_xy": [
    224604.5089960586,
    240869.46920607713
   ]
  },
  "max_20m": {
   "gradient_pct": 26.812607259753953,
   "start_distance_m": 468.0,
   "end_distance_m": 488.0,
   "midpoint_distance_m": 478.0,
   "start_elevation_m": 55.02972210983597,
   "end_elevation_m": 60.39224356178676,
   "start_xy": [
    224693.35782314785,
    240918.96823750852
   ],
   "end_xy": [
    224673.95076054952,
    240914.31490291507
   ]
  },
  "max_25m": {
   "gradient_pct": 26.266902330679073,
   "start_distance_m": 462.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 474.5,
   "start_elevation_m": 53.58043161645766,
   "end_elevation_m": 60.14715719912743,
   "start_xy": [
    224699.3168259328,
    240919.6539392963
   ],
   "end_xy": [
    224674.89759280576,
    240914.6366305616
   ]
  },
  "max_50m": {
   "gradient_pct": 24.670248394498245,
   "start_distance_m": 447.0,
   "end_distance_m": 497.0,
   "midpoint_distance_m": 472.0,
   "start_elevation_m": 50.113914221753696,
   "end_elevation_m": 62.44903841900282,
   "start_xy": [
    224714.26724156525,
    240919.15619949915
   ],
   "end_xy": [
    224665.42928344486,
    240911.41931547326
   ]
  },
  "max_100m": {
   "gradient_pct": 22.871461007277148,
   "start_distance_m": 408.0,
   "end_distance_m": 508.0,
   "midpoint_distance_m": 458.0,
   "start_elevation_m": 42.10954810689475,
   "end_elevation_m": 64.9810091141719,
   "start_xy": [
    224752.65765734107,
    240912.85963360363
   ],
   "end_xy": [
    224655.02694301397,
    240907.84282088216
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.663560392804641,
   "start_distance_m": 678.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 680.5,
   "start_elevation_m": 83.02080399598718,
   "end_elevation_m": 82.73762597634695,
   "start_xy": [
    224523.23770064276,
    240841.03553596986
   ],
   "end_xy": [
    224518.64639484684,
    240843.0154125035
   ]
  },
  "min_10m": {
   "gradient_pct": -3.581560647810278,
   "start_distance_m": 673.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 678.0,
   "start_elevation_m": 83.09578204112798,
   "end_elevation_m": 82.73762597634695,
   "start_xy": [
    224527.82900643867,
    240839.0556594362
   ],
   "end_xy": [
    224518.64639484684,
    240843.0154125035
   ]
  },
  "min_20m": {
   "gradient_pct": -1.5091041888904044,
   "start_distance_m": 663.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 673.0,
   "start_elevation_m": 83.03944681412503,
   "end_elevation_m": 82.73762597634695,
   "start_xy": [
    224537.0116180305,
    240835.09590636895
   ],
   "end_xy": [
    224518.64639484684,
    240843.0154125035
   ]
  },
  "min_25m": {
   "gradient_pct": -0.7085553910189901,
   "start_distance_m": 658.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 670.5,
   "start_elevation_m": 82.9147648241017,
   "end_elevation_m": 82.73762597634695,
   "start_xy": [
    224541.74633287545,
    240833.5153768489
   ],
   "end_xy": [
    224518.64639484684,
    240843.0154125035
   ]
  },
  "min_50m": {
   "gradient_pct": 0.10293921666661277,
   "start_distance_m": 633.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 658.0,
   "start_elevation_m": 82.68615636801364,
   "end_elevation_m": 82.73762597634695,
   "start_xy": [
    224565.7951689559,
    240826.68676260844
   ],
   "end_xy": [
    224518.64639484684,
    240843.0154125035
   ]
  },
  "min_100m": {
   "gradient_pct": 2.4705180173714183,
   "start_distance_m": 132.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 182.0,
   "start_elevation_m": 18.059199781041812,
   "end_elevation_m": 20.52971779841323,
   "start_xy": [
    224745.55759358767,
    241036.53439170175
   ],
   "end_xy": [
    224808.06186851594,
    240958.63783864994
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.33377414271607,
   "start_distance_m": 506.0,
   "end_distance_m": 508.0,
   "midpoint_distance_m": 507.0,
   "start_elevation_m": 64.05433363131758,
   "end_elevation_m": 64.9810091141719,
   "start_xy": [
    224656.91827763777,
    240908.49309262598
   ],
   "end_xy": [
    224655.02694301397,
    240907.84282088216
   ]
  },
  "max_3m": {
   "gradient_pct": 42.83762272347976,
   "start_distance_m": 483.0,
   "end_distance_m": 486.0,
   "midpoint_distance_m": 484.5,
   "start_elevation_m": 58.60655579022463,
   "end_elevation_m": 59.891684471929025,
   "start_xy": [
    224678.70694179914,
    240915.85199442762
   ],
   "end_xy": [
    224675.844425062,
    240914.95835820815
   ]
  }
 },
 "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": 0.283,
   "obstruction_max_height_m": 14.91,
   "flagged_windows_m": [
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.018,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    306.0,
    311.0
   ],
   [
    509.0,
    514.0
   ]
  ],
  "review": [],
  "extent": []
 },
 "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/wales/dtm_1m/wg_del_14_224240_20210210dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_14_224241_20210210dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:07:44+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
   "wg_del_14_224240_20210210dtm.tif",
   "wg_del_14_224241_20210210dtm.tif"
  ],
  "elevation_capture_dates": [
   "11-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 19.2% over 200 m (Terrain 50), gain 59.3 m over 378 m way. EXTENDED by graph walk: +4 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.0389, -4.5574)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.0389, -4.5574)'"
 },
 "area": {
  "place": "Abercych",
  "county": "Sir Benfro - Pembrokeshire"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.485,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 223.0,
  "shape_class": "stepped"
 }
}