{
 "ocl_version": "0.1.0",
 "name": "Lane near Philham",
 "slug": "discovered-lane-50-9738-4-4868",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.158822713832365,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 168.0,
   "end_distance_m": 170.0,
   "start_elevation_m": 126.23071984113594,
   "end_elevation_m": 126.77389629541258,
   "min_gradient_pct": -47.07513217137631,
   "suppressed_max_gradient_pct": 65.9599251911473,
   "suppressed_location_m": [
    12.0,
    14.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.641337801414505,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 168.0,
   "end_distance_m": 171.0,
   "start_elevation_m": 126.23071984113594,
   "end_elevation_m": 127.02995997517837,
   "min_gradient_pct": -46.49976443523087,
   "suppressed_max_gradient_pct": 58.80514611318167,
   "suppressed_location_m": [
    12.0,
    15.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.02060473141364,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 166.0,
   "end_distance_m": 171.0,
   "start_elevation_m": 125.72892973860769,
   "end_elevation_m": 127.02995997517837,
   "min_gradient_pct": -43.02341574169304,
   "suppressed_max_gradient_pct": 46.54667677525566,
   "suppressed_location_m": [
    12.0,
    17.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.13928885919688,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 161.0,
   "end_distance_m": 171.0,
   "start_elevation_m": 124.61603108925868,
   "end_elevation_m": 127.02995997517837,
   "min_gradient_pct": -25.672486656255984,
   "suppressed_max_gradient_pct": 25.088150933016493,
   "suppressed_location_m": [
    9.0,
    19.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.746639008721274,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 175.0,
   "end_distance_m": 195.0,
   "start_elevation_m": 127.77233585001929,
   "end_elevation_m": 132.32166365176354,
   "min_gradient_pct": -11.698729699247892
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.66730827526453,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 165.0,
   "end_distance_m": 190.0,
   "start_elevation_m": 125.53270947403814,
   "end_elevation_m": 131.19953654285428,
   "min_gradient_pct": -6.7931603757369885
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.83378317327299,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 147.0,
   "end_distance_m": 197.0,
   "start_elevation_m": 121.79879841242789,
   "end_elevation_m": 132.71568999906438,
   "min_gradient_pct": -1.4710791959603284
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.671236700304334,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 115.0,
   "end_distance_m": 215.0,
   "start_elevation_m": 117.5031967749904,
   "end_elevation_m": 135.17443347529473,
   "min_gradient_pct": 1.8052634864338444
  }
 ],
 "shape": {
  "ascent_concentration": 0.461,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 110.0,
  "shape_class": "stepped"
 },
 "length_m": 340.02069178875024,
 "start_elevation_m": 113.47668875961284,
 "end_elevation_m": 144.47052582661422,
 "endpoint_gain_m": 30.99383706700138,
 "overall_gradient_pct": 9.115279691936331,
 "accumulated_ascent_m": 34.703419988527344,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.02060473141364,
   "start_distance_m": 166.0,
   "end_distance_m": 171.0,
   "midpoint_distance_m": 168.5,
   "start_elevation_m": 125.72892973860769,
   "end_elevation_m": 127.02995997517837,
   "start_xy": [
    225495.88468851356,
    122303.34941745628
   ],
   "end_xy": [
    225498.2035582993,
    122307.77682735093
   ]
  },
  "max_10m": {
   "gradient_pct": 24.13928885919688,
   "start_distance_m": 161.0,
   "end_distance_m": 171.0,
   "midpoint_distance_m": 166.0,
   "start_elevation_m": 124.61603108925868,
   "end_elevation_m": 127.02995997517837,
   "start_xy": [
    225492.71444037932,
    122299.48726687003
   ],
   "end_xy": [
    225498.2035582993,
    122307.77682735093
   ]
  },
  "max_20m": {
   "gradient_pct": 22.746639008721274,
   "start_distance_m": 175.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 185.0,
   "start_elevation_m": 127.77233585001929,
   "end_elevation_m": 132.32166365176354,
   "start_xy": [
    225499.94918825943,
    122311.3679522324
   ],
   "end_xy": [
    225505.9477181049,
    122330.40039944612
   ]
  },
  "max_25m": {
   "gradient_pct": 22.66730827526453,
   "start_distance_m": 165.0,
   "end_distance_m": 190.0,
   "midpoint_distance_m": 177.5,
   "start_elevation_m": 125.53270947403814,
   "end_elevation_m": 131.19953654285428,
   "start_xy": [
    225495.28451050707,
    122302.55235054271
   ],
   "end_xy": [
    225503.97166073704,
    122325.80764686342
   ]
  },
  "max_50m": {
   "gradient_pct": 21.83378317327299,
   "start_distance_m": 147.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 121.79879841242789,
   "end_elevation_m": 132.71568999906438,
   "start_xy": [
    225482.5709183913,
    122290.05835732074
   ],
   "end_xy": [
    225506.922062176,
    122332.14427380779
   ]
  },
  "max_100m": {
   "gradient_pct": 17.671236700304334,
   "start_distance_m": 115.0,
   "end_distance_m": 215.0,
   "midpoint_distance_m": 165.0,
   "start_elevation_m": 117.5031967749904,
   "end_elevation_m": 135.17443347529473,
   "start_xy": [
    225451.98224473622,
    122280.96786142039
   ],
   "end_xy": [
    225516.8296426988,
    122347.16683870215
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -43.02341574169304,
   "start_distance_m": 20.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 22.5,
   "start_elevation_m": 115.87721987374164,
   "end_elevation_m": 113.72604908665699,
   "start_xy": [
    225357.17201189214,
    122278.41275089297
   ],
   "end_xy": [
    225362.17179990525,
    122278.36675280085
   ]
  },
  "min_10m": {
   "gradient_pct": -25.672486656255984,
   "start_distance_m": 19.0,
   "end_distance_m": 29.0,
   "midpoint_distance_m": 24.0,
   "start_elevation_m": 115.99989044299852,
   "end_elevation_m": 113.43264177737292,
   "start_xy": [
    225356.17205238968,
    122278.42175052849
   ],
   "end_xy": [
    225366.1716284159,
    122278.32975434426
   ]
  },
  "min_20m": {
   "gradient_pct": -11.698729699247892,
   "start_distance_m": 18.0,
   "end_distance_m": 38.0,
   "midpoint_distance_m": 28.0,
   "start_elevation_m": 115.97338457360343,
   "end_elevation_m": 113.63363863375385,
   "start_xy": [
    225355.17209288722,
    122278.43075016401
   ],
   "end_xy": [
    225375.17124493967,
    122278.24675779554
   ]
  },
  "min_25m": {
   "gradient_pct": -6.7931603757369885,
   "start_distance_m": 20.0,
   "end_distance_m": 45.0,
   "midpoint_distance_m": 32.5,
   "start_elevation_m": 115.87721987374164,
   "end_elevation_m": 114.17892977980739,
   "start_xy": [
    225357.17201189214,
    122278.41275089297
   ],
   "end_xy": [
    225382.17024614994,
    122278.14809997703
   ]
  },
  "min_50m": {
   "gradient_pct": -1.4710791959603284,
   "start_distance_m": 18.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 43.0,
   "start_elevation_m": 115.97338457360343,
   "end_elevation_m": 115.23784497562326,
   "start_xy": [
    225355.17209288722,
    122278.43075016401
   ],
   "end_xy": [
    225405.16373788667,
    122277.72527852423
   ]
  },
  "min_100m": {
   "gradient_pct": 1.8052634864338444,
   "start_distance_m": 17.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 67.0,
   "start_elevation_m": 115.89383295040976,
   "end_elevation_m": 117.6990964368436,
   "start_xy": [
    225354.17213343657,
    122278.43975555462
   ],
   "end_xy": [
    225453.9414456049,
    122281.36977177384
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.158822713832365,
   "start_distance_m": 168.0,
   "end_distance_m": 170.0,
   "midpoint_distance_m": 169.0,
   "start_elevation_m": 126.23071984113594,
   "end_elevation_m": 126.77389629541258,
   "start_xy": [
    225496.8402087872,
    122305.1045106181
   ],
   "end_xy": [
    225497.74925311832,
    122306.88598134014
   ]
  },
  "max_3m": {
   "gradient_pct": 26.641337801414505,
   "start_distance_m": 168.0,
   "end_distance_m": 171.0,
   "midpoint_distance_m": 169.5,
   "start_elevation_m": 126.23071984113594,
   "end_elevation_m": 127.02995997517837,
   "start_xy": [
    225496.8402087872,
    122305.1045106181
   ],
   "end_xy": [
    225498.2035582993,
    122307.77682735093
   ]
  }
 },
 "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": 0.026,
   "obstruction_max_height_m": 7.95,
   "flagged_windows_m": [
    2
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.018,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    10.0,
    15.0
   ]
  ],
  "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/england/bulk_dtm_1m/SS2520.tif"
  ],
  "calculated_at": "2026-08-19T18:21:01+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": [
   "SS2520.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.8% over 200 m (Terrain 50), gain 28.8 m over 324 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 (50.9738, -4.4868)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.9738, -4.4868)'"
 },
 "area": {
  "place": "Philham",
  "county": "Devon"
 }
}