{
 "ocl_version": "0.1.0",
 "name": "Burthwaite",
 "slug": "burthwaite",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.68525981450955,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1058.0,
   "end_distance_m": 1060.0,
   "start_elevation_m": 137.05526126996926,
   "end_elevation_m": 137.98896646625946,
   "min_gradient_pct": -44.49546614977464
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 37.80542653057921,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1058.0,
   "end_distance_m": 1061.0,
   "start_elevation_m": 137.05526126996926,
   "end_elevation_m": 138.18942406588664,
   "min_gradient_pct": -38.76989028415115
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 32.8201623410871,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1055.0,
   "end_distance_m": 1060.0,
   "start_elevation_m": 136.3479583492051,
   "end_elevation_m": 137.98896646625946,
   "min_gradient_pct": -28.516277788556295
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.465137276678718,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1172.0,
   "end_distance_m": 1182.0,
   "start_elevation_m": 144.16515628893197,
   "end_elevation_m": 147.21167001659984,
   "min_gradient_pct": -25.477035225664793
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.810273815823365,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1162.0,
   "end_distance_m": 1182.0,
   "start_elevation_m": 142.24961525343517,
   "end_elevation_m": 147.21167001659984,
   "min_gradient_pct": -20.914846474328073
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.350965447533326,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1157.0,
   "end_distance_m": 1182.0,
   "start_elevation_m": 141.1239286547165,
   "end_elevation_m": 147.21167001659984,
   "min_gradient_pct": -17.171144723412226
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.698391589406242,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1141.0,
   "end_distance_m": 1191.0,
   "start_elevation_m": 138.25084871712397,
   "end_elevation_m": 147.6000445118271,
   "min_gradient_pct": -8.51981632650137
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.64718024960794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1261.0,
   "end_distance_m": 1361.0,
   "start_elevation_m": 143.28201699658942,
   "end_elevation_m": 155.92919724619736,
   "min_gradient_pct": -1.4153631083908635
  }
 ],
 "shape": {
  "ascent_concentration": 0.456,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 88.0,
  "shape_class": "stepped"
 },
 "length_m": 1597.4367040493162,
 "start_elevation_m": 97.55262013938861,
 "end_elevation_m": 170.57960189892648,
 "endpoint_gain_m": 73.02698175953788,
 "overall_gradient_pct": 4.571510193450731,
 "accumulated_ascent_m": 87.7940580757425,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 32.8201623410871,
   "start_distance_m": 1055.0,
   "end_distance_m": 1060.0,
   "midpoint_distance_m": 1057.5,
   "start_elevation_m": 136.3479583492051,
   "end_elevation_m": 137.98896646625946,
   "start_xy": [
    323961.39396206115,
    531917.6237068881
   ],
   "end_xy": [
    323964.4749632664,
    531913.6857592535
   ]
  },
  "max_10m": {
   "gradient_pct": 30.465137276678718,
   "start_distance_m": 1172.0,
   "end_distance_m": 1182.0,
   "midpoint_distance_m": 1177.0,
   "start_elevation_m": 144.16515628893197,
   "end_elevation_m": 147.21167001659984,
   "start_xy": [
    324021.56769649644,
    531829.8972174579
   ],
   "end_xy": [
    324030.0589676799,
    531824.6153320285
   ]
  },
  "max_20m": {
   "gradient_pct": 24.810273815823365,
   "start_distance_m": 1162.0,
   "end_distance_m": 1182.0,
   "midpoint_distance_m": 1172.0,
   "start_elevation_m": 142.24961525343517,
   "end_elevation_m": 147.21167001659984,
   "start_xy": [
    324013.076425313,
    531835.1791028873
   ],
   "end_xy": [
    324030.0589676799,
    531824.6153320285
   ]
  },
  "max_25m": {
   "gradient_pct": 24.350965447533326,
   "start_distance_m": 1157.0,
   "end_distance_m": 1182.0,
   "midpoint_distance_m": 1169.5,
   "start_elevation_m": 141.1239286547165,
   "end_elevation_m": 147.21167001659984,
   "start_xy": [
    324008.8307897213,
    531837.8200456019
   ],
   "end_xy": [
    324030.0589676799,
    531824.6153320285
   ]
  },
  "max_50m": {
   "gradient_pct": 18.698391589406242,
   "start_distance_m": 1141.0,
   "end_distance_m": 1191.0,
   "midpoint_distance_m": 1166.0,
   "start_elevation_m": 138.25084871712397,
   "end_elevation_m": 147.6000445118271,
   "start_xy": [
    323995.2447558277,
    531846.2710622889
   ],
   "end_xy": [
    324037.70111174503,
    531819.861635142
   ]
  },
  "max_100m": {
   "gradient_pct": 12.64718024960794,
   "start_distance_m": 1261.0,
   "end_distance_m": 1361.0,
   "midpoint_distance_m": 1311.0,
   "start_elevation_m": 143.28201699658942,
   "end_elevation_m": 155.92919724619736,
   "start_xy": [
    324088.2419491961,
    531774.11705746
   ],
   "end_xy": [
    324125.0726296048,
    531861.6956659037
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -28.516277788556295,
   "start_distance_m": 1194.0,
   "end_distance_m": 1199.0,
   "midpoint_distance_m": 1196.5,
   "start_elevation_m": 147.25917665472687,
   "end_elevation_m": 145.83336276529906,
   "start_xy": [
    324040.24849310005,
    531818.2770695132
   ],
   "end_xy": [
    324044.4941286918,
    531815.6361267986
   ]
  },
  "min_10m": {
   "gradient_pct": -25.477035225664793,
   "start_distance_m": 1194.0,
   "end_distance_m": 1204.0,
   "midpoint_distance_m": 1199.0,
   "start_elevation_m": 147.25917665472687,
   "end_elevation_m": 144.7114731321604,
   "start_xy": [
    324040.24849310005,
    531818.2770695132
   ],
   "end_xy": [
    324048.7397642835,
    531812.9951840839
   ]
  },
  "min_20m": {
   "gradient_pct": -20.914846474328073,
   "start_distance_m": 1192.0,
   "end_distance_m": 1212.0,
   "midpoint_distance_m": 1202.0,
   "start_elevation_m": 147.69782974471252,
   "end_elevation_m": 143.5148604498469,
   "start_xy": [
    324038.5502388634,
    531819.3334465991
   ],
   "end_xy": [
    324055.5327812303,
    531808.7696757404
   ]
  },
  "min_25m": {
   "gradient_pct": -17.171144723412226,
   "start_distance_m": 1188.0,
   "end_distance_m": 1213.0,
   "midpoint_distance_m": 1200.5,
   "start_elevation_m": 147.7789744249945,
   "end_elevation_m": 143.48618824414143,
   "start_xy": [
    324035.15373039,
    531821.4462007709
   ],
   "end_xy": [
    324056.38190834865,
    531808.2414871975
   ]
  },
  "min_50m": {
   "gradient_pct": -8.51981632650137,
   "start_distance_m": 1192.0,
   "end_distance_m": 1242.0,
   "midpoint_distance_m": 1217.0,
   "start_elevation_m": 147.69782974471252,
   "end_elevation_m": 143.43792158146184,
   "start_xy": [
    324038.5502388634,
    531819.3334465991
   ],
   "end_xy": [
    324078.43872386025,
    531790.3927071557
   ]
  },
  "min_100m": {
   "gradient_pct": -1.4153631083908635,
   "start_distance_m": 1184.0,
   "end_distance_m": 1284.0,
   "midpoint_distance_m": 1234.0,
   "start_elevation_m": 147.4548495912938,
   "end_elevation_m": 146.03948648290293,
   "start_xy": [
    324031.75722191663,
    531823.5589549426
   ],
   "end_xy": [
    324098.3709009951,
    531793.0905190804
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.68525981450955,
   "start_distance_m": 1058.0,
   "end_distance_m": 1060.0,
   "midpoint_distance_m": 1059.0,
   "start_elevation_m": 137.05526126996926,
   "end_elevation_m": 137.98896646625946,
   "start_xy": [
    323963.2425627843,
    531915.2609383073
   ],
   "end_xy": [
    323964.4749632664,
    531913.6857592535
   ]
  },
  "max_3m": {
   "gradient_pct": 37.80542653057921,
   "start_distance_m": 1058.0,
   "end_distance_m": 1061.0,
   "midpoint_distance_m": 1059.5,
   "start_elevation_m": 137.05526126996926,
   "end_elevation_m": 138.18942406588664,
   "start_xy": [
    323963.2425627843,
    531915.2609383073
   ],
   "end_xy": [
    323964.9355801193,
    531912.8365734778
   ]
  }
 },
 "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": 0.049,
   "obstruction_max_height_m": 14.28,
   "flagged_windows_m": [
    2,
    3,
    5
   ]
  },
  "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/NY2030.tif"
  ],
  "calculated_at": "2026-08-16T00:02:43+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": [
   "NY2030.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.7% over 200 m (Terrain 50), gain 48.2 m over 1261 m way. EXTENDED by graph walk: +0 segment(s) at base, +3 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
  "place": "Bassenthwaite",
  "county": "Cumberland"
 }
}