{
 "ocl_version": "0.1.0",
 "name": "Hay on Wye to Mynydd Brith",
 "slug": "discovered-lane-52-0661-3-0870",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.99411167910273,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2657.0,
   "end_distance_m": 2659.0,
   "start_elevation_m": 291.59977666838984,
   "end_elevation_m": 292.1796589019719,
   "min_gradient_pct": -19.815186761709924
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.921582445326447,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2025.0,
   "end_distance_m": 2028.0,
   "start_elevation_m": 218.85650674795758,
   "end_elevation_m": 219.66415422131738,
   "min_gradient_pct": -19.48558839284639
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.349511764459635,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2025.0,
   "end_distance_m": 2030.0,
   "start_elevation_m": 218.85650674795758,
   "end_elevation_m": 220.07398233618056,
   "min_gradient_pct": -13.286945864655308
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.31713743628012,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2360.0,
   "end_distance_m": 2370.0,
   "start_elevation_m": 254.29706336802835,
   "end_elevation_m": 256.42877711165636,
   "min_gradient_pct": -9.340490937627806
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.777297878549348,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2347.0,
   "end_distance_m": 2367.0,
   "start_elevation_m": 251.62525768150823,
   "end_elevation_m": 255.7807172572181,
   "min_gradient_pct": -7.96119168129934
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.79418653220955,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2347.0,
   "end_distance_m": 2372.0,
   "start_elevation_m": 251.62525768150823,
   "end_elevation_m": 256.8238043145606,
   "min_gradient_pct": -7.43207518731333
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.333101307923528,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2322.0,
   "end_distance_m": 2372.0,
   "start_elevation_m": 247.15725366059885,
   "end_elevation_m": 256.8238043145606,
   "min_gradient_pct": -4.266055941793525
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.636437821102305,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2302.0,
   "end_distance_m": 2402.0,
   "start_elevation_m": 244.1839079071572,
   "end_elevation_m": 261.8203457282595,
   "min_gradient_pct": -3.049660400334915
  }
 ],
 "shape": {
  "ascent_concentration": 0.442,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 188.0,
  "shape_class": "sustained"
 },
 "length_m": 6041.861838827222,
 "start_elevation_m": 95.68059076654069,
 "end_elevation_m": 427.38691695922876,
 "endpoint_gain_m": 331.70632619268804,
 "overall_gradient_pct": 5.490134250687785,
 "accumulated_ascent_m": 350.9598367239321,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.349511764459635,
   "start_distance_m": 2025.0,
   "end_distance_m": 2030.0,
   "midpoint_distance_m": 2027.5,
   "start_elevation_m": 218.85650674795758,
   "end_elevation_m": 220.07398233618056,
   "start_xy": [
    325321.2176669129,
    241786.81324964255
   ],
   "end_xy": [
    325326.2167628486,
    241786.90832764073
   ]
  },
  "max_10m": {
   "gradient_pct": 21.31713743628012,
   "start_distance_m": 2360.0,
   "end_distance_m": 2370.0,
   "midpoint_distance_m": 2365.0,
   "start_elevation_m": 254.29706336802835,
   "end_elevation_m": 256.42877711165636,
   "start_xy": [
    325526.5376311201,
    241720.99954812945
   ],
   "end_xy": [
    325533.8379307086,
    241714.16644144454
   ]
  },
  "max_20m": {
   "gradient_pct": 20.777297878549348,
   "start_distance_m": 2347.0,
   "end_distance_m": 2367.0,
   "midpoint_distance_m": 2357.0,
   "start_elevation_m": 251.62525768150823,
   "end_elevation_m": 255.7807172572181,
   "start_xy": [
    325521.5231683526,
    241732.44218792915
   ],
   "end_xy": [
    325531.6170138751,
    241716.18325289298
   ]
  },
  "max_25m": {
   "gradient_pct": 20.79418653220955,
   "start_distance_m": 2347.0,
   "end_distance_m": 2372.0,
   "midpoint_distance_m": 2359.5,
   "start_elevation_m": 251.62525768150823,
   "end_elevation_m": 256.8238043145606,
   "start_xy": [
    325521.5231683526,
    241732.44218792915
   ],
   "end_xy": [
    325535.31854193093,
    241712.82190047888
   ]
  },
  "max_50m": {
   "gradient_pct": 19.333101307923528,
   "start_distance_m": 2322.0,
   "end_distance_m": 2372.0,
   "midpoint_distance_m": 2347.0,
   "start_elevation_m": 247.15725366059885,
   "end_elevation_m": 256.8238043145606,
   "start_xy": [
    325523.49496482185,
    241756.51350278925
   ],
   "end_xy": [
    325535.31854193093,
    241712.82190047888
   ]
  },
  "max_100m": {
   "gradient_pct": 17.636437821102305,
   "start_distance_m": 2302.0,
   "end_distance_m": 2402.0,
   "midpoint_distance_m": 2352.0,
   "start_elevation_m": 244.1839079071572,
   "end_elevation_m": 261.8203457282595,
   "start_xy": [
    325534.0384114657,
    241773.5086707163
   ],
   "end_xy": [
    325557.1830061535,
    241692.3084686959
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.286945864655308,
   "start_distance_m": 2020.0,
   "end_distance_m": 2025.0,
   "midpoint_distance_m": 2022.5,
   "start_elevation_m": 219.52085404119035,
   "end_elevation_m": 218.85650674795758,
   "start_xy": [
    325316.2185709772,
    241786.71817164434
   ],
   "end_xy": [
    325321.2176669129,
    241786.81324964255
   ]
  },
  "min_10m": {
   "gradient_pct": -9.340490937627806,
   "start_distance_m": 2688.0,
   "end_distance_m": 2698.0,
   "midpoint_distance_m": 2693.0,
   "start_elevation_m": 292.687613731398,
   "end_elevation_m": 291.75356463763524,
   "start_xy": [
    325581.8657255372,
    241412.88975720413
   ],
   "end_xy": [
    325591.57779999735,
    241413.68868486682
   ]
  },
  "min_20m": {
   "gradient_pct": -7.96119168129934,
   "start_distance_m": 2681.0,
   "end_distance_m": 2701.0,
   "midpoint_distance_m": 2691.0,
   "start_elevation_m": 293.1357116936,
   "end_elevation_m": 291.54347335734013,
   "start_xy": [
    325576.37025261216,
    241417.22562820432
   ],
   "end_xy": [
    325594.41865284584,
    241414.65281924195
   ]
  },
  "min_25m": {
   "gradient_pct": -7.43207518731333,
   "start_distance_m": 2677.0,
   "end_distance_m": 2702.0,
   "midpoint_distance_m": 2689.5,
   "start_elevation_m": 293.3406937783101,
   "end_elevation_m": 291.48267498148175,
   "start_xy": [
    325573.7227947554,
    241420.15575835283
   ],
   "end_xy": [
    325595.36560379533,
    241414.974197367
   ]
  },
  "min_50m": {
   "gradient_pct": -4.266055941793525,
   "start_distance_m": 4931.0,
   "end_distance_m": 4981.0,
   "midpoint_distance_m": 4956.0,
   "start_elevation_m": 402.39404716431113,
   "end_elevation_m": 400.26101919341437,
   "start_xy": [
    326795.0768856241,
    240151.29553216632
   ],
   "end_xy": [
    326844.82327971334,
    240156.32507241497
   ]
  },
  "min_100m": {
   "gradient_pct": -3.049660400334915,
   "start_distance_m": 4906.0,
   "end_distance_m": 5006.0,
   "midpoint_distance_m": 4956.0,
   "start_elevation_m": 402.75993820422417,
   "end_elevation_m": 399.71027780388926,
   "start_xy": [
    326770.20368857944,
    240148.78076204198
   ],
   "end_xy": [
    326869.696476758,
    240158.8398425393
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.99411167910273,
   "start_distance_m": 2657.0,
   "end_distance_m": 2659.0,
   "midpoint_distance_m": 2658.0,
   "start_elevation_m": 291.59977666838984,
   "end_elevation_m": 292.1796589019719,
   "start_xy": [
    325566.33537265076,
    241438.20257467634
   ],
   "end_xy": [
    325566.2142827962,
    241436.20624373003
   ]
  },
  "max_3m": {
   "gradient_pct": 26.921582445326447,
   "start_distance_m": 2025.0,
   "end_distance_m": 2028.0,
   "midpoint_distance_m": 2026.5,
   "start_elevation_m": 218.85650674795758,
   "end_elevation_m": 219.66415422131738,
   "start_xy": [
    325321.2176669129,
    241786.81324964255
   ],
   "end_xy": [
    325324.21712447435,
    241786.87029644146
   ]
  }
 },
 "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": 0.006,
   "obstruction_max_height_m": 11.92,
   "flagged_windows_m": []
  },
  "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/england/bulk_dtm_1m/SO2035.tif",
   "data/cache/england/bulk_dtm_1m/SO2535.tif",
   "data/cache/england/bulk_dtm_1m/SO2040.tif",
   "data/cache/england/bulk_dtm_1m/SO2540.tif"
  ],
  "calculated_at": "2026-08-15T12:38:18+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
  "elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
  "elevation_tile_ids": [
   "SO2035.tif",
   "SO2535.tif",
   "SO2040.tif",
   "SO2540.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.3% over 200 m (Terrain 50), gain 313.4 m over 5557 m way. EXTENDED by graph walk: +3 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.0661, -3.0870)'"
 },
 "area": {
  "place": "Scudamore Dingle",
  "county": "County of Herefordshire"
 }
}