{
 "ocl_version": "0.1.0",
 "name": "Lane near Oxford Down",
 "slug": "discovered-lane-51-0490-3-8894",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.525670250959934,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 227.0,
   "end_distance_m": 229.0,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 144.49944014017797,
   "min_gradient_pct": -18.242770761983707,
   "suppressed_max_gradient_pct": 84.03805289657029,
   "suppressed_location_m": [
    0.0,
    2.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.708276600399472,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 228.0,
   "end_distance_m": 231.0,
   "start_elevation_m": 144.1687289992814,
   "end_elevation_m": 144.96997729729338,
   "min_gradient_pct": -14.130463930868586,
   "suppressed_max_gradient_pct": 60.24619650047688,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.98435591196767,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 227.0,
   "end_distance_m": 232.0,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 145.17814453075715,
   "min_gradient_pct": -13.561122859036345,
   "suppressed_max_gradient_pct": 36.02443806807912,
   "suppressed_location_m": [
    0.0,
    5.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.866359526617828,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 227.0,
   "end_distance_m": 237.0,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 146.21556268782055,
   "min_gradient_pct": -13.016416623330826
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.817587519657224,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 221.0,
   "end_distance_m": 241.0,
   "start_elevation_m": 142.8020204865143,
   "end_elevation_m": 146.96553799044574,
   "min_gradient_pct": -11.303143324978748
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.161487068236625,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 214.0,
   "end_distance_m": 239.0,
   "start_elevation_m": 141.56914270069132,
   "end_elevation_m": 146.60951446775047,
   "min_gradient_pct": -10.387527002927868
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.583022828461594,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 194.0,
   "end_distance_m": 244.0,
   "start_elevation_m": 138.9915013486537,
   "end_elevation_m": 147.2830127628845,
   "min_gradient_pct": -7.3753288444207215
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.930777491395615,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 142.0,
   "end_distance_m": 242.0,
   "start_elevation_m": 134.17722550594863,
   "end_elevation_m": 147.10800299734424,
   "min_gradient_pct": -4.2947276318132594
  }
 ],
 "shape": {
  "ascent_concentration": 0.653,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 58.0,
  "shape_class": "stepped"
 },
 "length_m": 660.49046925718,
 "start_elevation_m": 124.98817161863587,
 "end_elevation_m": 145.0732570543199,
 "endpoint_gain_m": 20.08508543568402,
 "overall_gradient_pct": 3.0409349370737617,
 "accumulated_ascent_m": 28.017927217892947,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.98435591196767,
   "start_distance_m": 227.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 229.5,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 145.17814453075715,
   "start_xy": [
    267655.274274509,
    129429.80597518789
   ],
   "end_xy": [
    267657.17971256946,
    129434.4278225939
   ]
  },
  "max_10m": {
   "gradient_pct": 22.866359526617828,
   "start_distance_m": 227.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 232.0,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 146.21556268782055,
   "start_xy": [
    267655.274274509,
    129429.80597518789
   ],
   "end_xy": [
    267660.87610467634,
    129437.20289882725
   ]
  },
  "max_20m": {
   "gradient_pct": 20.817587519657224,
   "start_distance_m": 221.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 231.0,
   "start_elevation_m": 142.8020204865143,
   "end_elevation_m": 146.96553799044574,
   "start_xy": [
    267653.3287098127,
    129424.1302135576
   ],
   "end_xy": [
    267664.8349901614,
    129437.43691004919
   ]
  },
  "max_25m": {
   "gradient_pct": 20.161487068236625,
   "start_distance_m": 214.0,
   "end_distance_m": 239.0,
   "midpoint_distance_m": 226.5,
   "start_elevation_m": 141.56914270069132,
   "end_elevation_m": 146.60951446775047,
   "start_xy": [
    267651.56686499674,
    129417.35616137281
   ],
   "end_xy": [
    267662.8350151609,
    129437.4469099242
   ]
  },
  "max_50m": {
   "gradient_pct": 16.583022828461594,
   "start_distance_m": 194.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 219.0,
   "start_elevation_m": 138.9915013486537,
   "end_elevation_m": 147.2830127628845,
   "start_xy": [
    267640.5047629939,
    129401.54657707995
   ],
   "end_xy": [
    267667.8349526621,
    129437.42191023669
   ]
  },
  "max_100m": {
   "gradient_pct": 12.930777491395615,
   "start_distance_m": 142.0,
   "end_distance_m": 242.0,
   "midpoint_distance_m": 192.0,
   "start_elevation_m": 134.17722550594863,
   "end_elevation_m": 147.10800299734424,
   "start_xy": [
    267596.6014544632,
    129373.86509171063
   ],
   "end_xy": [
    267665.8349776616,
    129437.4319101117
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.561122859036345,
   "start_distance_m": 596.0,
   "end_distance_m": 601.0,
   "midpoint_distance_m": 598.5,
   "start_elevation_m": 145.10919601756208,
   "end_elevation_m": 144.43113987461027,
   "start_xy": [
    268018.1610022496,
    129440.38795277695
   ],
   "end_xy": [
    268022.96848745144,
    129441.76202811762
   ]
  },
  "min_10m": {
   "gradient_pct": -13.016416623330826,
   "start_distance_m": 596.0,
   "end_distance_m": 606.0,
   "midpoint_distance_m": 601.0,
   "start_elevation_m": 145.10919601756208,
   "end_elevation_m": 143.807554355229,
   "start_xy": [
    268018.1610022496,
    129440.38795277695
   ],
   "end_xy": [
    268027.7760147286,
    129443.13595634792
   ]
  },
  "min_20m": {
   "gradient_pct": -11.303143324978748,
   "start_distance_m": 591.0,
   "end_distance_m": 611.0,
   "midpoint_distance_m": 601.0,
   "start_elevation_m": 145.5560336756411,
   "end_elevation_m": 143.29540501064534,
   "start_xy": [
    268013.3534752253,
    129439.01402462261
   ],
   "end_xy": [
    268032.6501345524,
    129444.2402946693
   ]
  },
  "min_25m": {
   "gradient_pct": -10.387527002927868,
   "start_distance_m": 589.0,
   "end_distance_m": 614.0,
   "midpoint_distance_m": 601.5,
   "start_elevation_m": 145.7034859548771,
   "end_elevation_m": 143.10660420414513,
   "start_xy": [
    268011.4305783601,
    129438.46405410502
   ],
   "end_xy": [
    268035.5897421017,
    129444.83921497781
   ]
  },
  "min_50m": {
   "gradient_pct": -7.3753288444207215,
   "start_distance_m": 571.0,
   "end_distance_m": 621.0,
   "midpoint_distance_m": 596.0,
   "start_elevation_m": 146.42664461691612,
   "end_elevation_m": 142.73898019470576,
   "start_xy": [
    267993.64868351916,
    129435.70274829237
   ],
   "end_xy": [
    268042.53281974106,
    129445.30609305875
   ]
  },
  "min_100m": {
   "gradient_pct": -4.2947276318132594,
   "start_distance_m": 531.0,
   "end_distance_m": 631.0,
   "midpoint_distance_m": 581.0,
   "start_elevation_m": 146.97488890386927,
   "end_elevation_m": 142.680161272056,
   "start_xy": [
    267953.7178557731,
    129433.4040231098
   ],
   "end_xy": [
    268052.53021432186,
    129445.0778660706
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.525670250959934,
   "start_distance_m": 227.0,
   "end_distance_m": 229.0,
   "midpoint_distance_m": 228.0,
   "start_elevation_m": 143.92892673515877,
   "end_elevation_m": 144.49944014017797,
   "start_xy": [
    267655.274274509,
    129429.80597518789
   ],
   "end_xy": [
    267656.0152656932,
    129431.66303274073
   ]
  },
  "max_3m": {
   "gradient_pct": 26.708276600399472,
   "start_distance_m": 228.0,
   "end_distance_m": 231.0,
   "midpoint_distance_m": 229.5,
   "start_elevation_m": 144.1687289992814,
   "end_elevation_m": 144.96997729729338,
   "start_xy": [
    267655.6266351486,
    129430.7416390925
   ],
   "end_xy": [
    267656.79137973126,
    129433.50630343416
   ]
  }
 },
 "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": 0.029,
   "obstruction_max_height_m": 6.66,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.015,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    3.0
   ],
   [
    634.0,
    639.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "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/SS6525.tif"
  ],
  "calculated_at": "2026-08-19T18:22:09+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SS6525.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.6% over 200 m (Terrain 50), gain 24.0 m over 655 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.0490, -3.8894)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.0490, -3.8894)'"
 },
 "area": {
  "place": "Filleigh",
  "county": "Devon"
 }
}