{
 "ocl_version": "0.1.0",
 "name": "Harper's Lane",
 "slug": "harper-s-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.57737603369634,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 280.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 114.89799550140583,
   "end_elevation_m": 115.84954302207976,
   "min_gradient_pct": -21.898826045176634
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 45.940467574089894,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 279.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 114.47132899485706,
   "end_elevation_m": 115.84954302207976,
   "min_gradient_pct": -13.367167452699391
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 41.57347104964032,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 277.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 113.77086946959774,
   "end_elevation_m": 115.84954302207976,
   "min_gradient_pct": -10.346480783611014
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 34.85329963514374,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 272.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 112.36421305856538,
   "end_elevation_m": 115.84954302207976,
   "min_gradient_pct": -9.162209980543423
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 33.34664391525443,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 263.0,
   "end_distance_m": 283.0,
   "start_elevation_m": 109.44067591516392,
   "end_elevation_m": 116.11000469821481,
   "min_gradient_pct": -7.483485290988767
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 30.73918880190268,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 261.0,
   "end_distance_m": 286.0,
   "start_elevation_m": 108.9199174442438,
   "end_elevation_m": 116.60471464471946,
   "min_gradient_pct": -7.190669038718056
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 26.46806092586462,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 259.0,
   "end_distance_m": 309.0,
   "start_elevation_m": 108.50689171699395,
   "end_elevation_m": 121.74092217992626,
   "min_gradient_pct": -6.566879121148702
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.389115232928802,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 219.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 102.1483554319598,
   "end_elevation_m": 123.5374706648886,
   "min_gradient_pct": -5.662350232825787
  }
 ],
 "shape": {
  "ascent_concentration": 0.422,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 113.0,
  "shape_class": "sustained"
 },
 "length_m": 812.8296922238279,
 "start_elevation_m": 72.9850488469699,
 "end_elevation_m": 150.7555961739651,
 "endpoint_gain_m": 77.7705473269952,
 "overall_gradient_pct": 9.56787726518972,
 "accumulated_ascent_m": 88.6732216565047,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 41.57347104964032,
   "start_distance_m": 277.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 279.5,
   "start_elevation_m": 113.77086946959774,
   "end_elevation_m": 115.84954302207976,
   "start_xy": [
    303383.7162246074,
    138025.39724419467
   ],
   "end_xy": [
    303387.8456749059,
    138022.57808825152
   ]
  },
  "max_10m": {
   "gradient_pct": 34.85329963514374,
   "start_distance_m": 272.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 277.0,
   "start_elevation_m": 112.36421305856538,
   "end_elevation_m": 115.84954302207976,
   "start_xy": [
    303379.5867743088,
    138028.2164001378
   ],
   "end_xy": [
    303387.8456749059,
    138022.57808825152
   ]
  },
  "max_20m": {
   "gradient_pct": 33.34664391525443,
   "start_distance_m": 263.0,
   "end_distance_m": 283.0,
   "midpoint_distance_m": 273.0,
   "start_elevation_m": 109.44067591516392,
   "end_elevation_m": 116.11000469821481,
   "start_xy": [
    303372.1537637714,
    138033.29088083547
   ],
   "end_xy": [
    303388.6715649656,
    138022.0142570629
   ]
  },
  "max_25m": {
   "gradient_pct": 30.73918880190268,
   "start_distance_m": 261.0,
   "end_distance_m": 286.0,
   "midpoint_distance_m": 273.5,
   "start_elevation_m": 108.9199174442438,
   "end_elevation_m": 116.60471464471946,
   "start_xy": [
    303370.501983652,
    138034.41854321276
   ],
   "end_xy": [
    303391.1492351448,
    138020.322763497
   ]
  },
  "max_50m": {
   "gradient_pct": 26.46806092586462,
   "start_distance_m": 259.0,
   "end_distance_m": 309.0,
   "midpoint_distance_m": 284.0,
   "start_elevation_m": 108.50689171699395,
   "end_elevation_m": 121.74092217992626,
   "start_xy": [
    303368.8502035326,
    138035.54620559
   ],
   "end_xy": [
    303410.0257864297,
    138007.70061711498
   ]
  },
  "max_100m": {
   "gradient_pct": 21.389115232928802,
   "start_distance_m": 219.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 269.0,
   "start_elevation_m": 102.1483554319598,
   "end_elevation_m": 123.5374706648886,
   "start_xy": [
    303335.8146011442,
    138058.09945313516
   ],
   "end_xy": [
    303416.95837260026,
    138000.49372811988
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.346480783611014,
   "start_distance_m": 716.0,
   "end_distance_m": 721.0,
   "midpoint_distance_m": 718.5,
   "start_elevation_m": 155.97216556659995,
   "end_elevation_m": 155.4548415274194,
   "start_xy": [
    303583.80542487383,
    137683.642466249
   ],
   "end_xy": [
    303584.6346620312,
    137678.71170913303
   ]
  },
  "min_10m": {
   "gradient_pct": -9.162209980543423,
   "start_distance_m": 716.0,
   "end_distance_m": 726.0,
   "midpoint_distance_m": 721.0,
   "start_elevation_m": 155.97216556659995,
   "end_elevation_m": 155.0559445685456,
   "start_xy": [
    303583.80542487383,
    137683.642466249
   ],
   "end_xy": [
    303585.4638991886,
    137673.78095201703
   ]
  },
  "min_20m": {
   "gradient_pct": -7.483485290988767,
   "start_distance_m": 710.0,
   "end_distance_m": 730.0,
   "midpoint_distance_m": 720.0,
   "start_elevation_m": 156.40442726647953,
   "end_elevation_m": 154.90773020828178,
   "start_xy": [
    303582.7715607007,
    137689.5515838168
   ],
   "end_xy": [
    303586.12728891446,
    137669.83634632424
   ]
  },
  "min_25m": {
   "gradient_pct": -7.190669038718056,
   "start_distance_m": 710.0,
   "end_distance_m": 735.0,
   "midpoint_distance_m": 722.5,
   "start_elevation_m": 156.40442726647953,
   "end_elevation_m": 154.60676000680002,
   "start_xy": [
    303582.7715607007,
    137689.5515838168
   ],
   "end_xy": [
    303586.9565260718,
    137664.90558920827
   ]
  },
  "min_50m": {
   "gradient_pct": -6.566879121148702,
   "start_distance_m": 710.0,
   "end_distance_m": 760.0,
   "midpoint_distance_m": 735.0,
   "start_elevation_m": 156.40442726647953,
   "end_elevation_m": 153.12098770590518,
   "start_xy": [
    303582.7715607007,
    137689.5515838168
   ],
   "end_xy": [
    303590.6755509759,
    137640.18622786322
   ]
  },
  "min_100m": {
   "gradient_pct": -5.662350232825787,
   "start_distance_m": 701.0,
   "end_distance_m": 801.0,
   "midpoint_distance_m": 751.0,
   "start_elevation_m": 156.79694240217933,
   "end_elevation_m": 151.13459216935354,
   "start_xy": [
    303580.72053511755,
    137698.31476212476
   ],
   "end_xy": [
    303595.5443021505,
    137599.48997326187
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.57737603369634,
   "start_distance_m": 280.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 281.0,
   "start_elevation_m": 114.89799550140583,
   "end_elevation_m": 115.84954302207976,
   "start_xy": [
    303386.1938947865,
    138023.70575062878
   ],
   "end_xy": [
    303387.8456749059,
    138022.57808825152
   ]
  },
  "max_3m": {
   "gradient_pct": 45.940467574089894,
   "start_distance_m": 279.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 280.5,
   "start_elevation_m": 114.47132899485706,
   "end_elevation_m": 115.84954302207976,
   "start_xy": [
    303385.3680047268,
    138024.2695818174
   ],
   "end_xy": [
    303387.8456749059,
    138022.57808825152
   ]
  }
 },
 "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": 0.173,
   "obstruction_max_height_m": 13.9,
   "flagged_windows_m": [
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 642.0,
  "trailing_descent_m": 6.9
 },
 "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/ST0035.tif"
  ],
  "calculated_at": "2026-08-15T05:11:27+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": [
   "ST0035.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.0% over 200 m (Terrain 50), gain 75.5 m over 764 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."
 },
 "area": {
  "place": "Tacker Street",
  "county": "Somerset"
 }
}