{
 "ocl_version": "0.1.0",
 "name": "The Pinch",
 "slug": "the-pinch",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.262454975001845,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 344.0,
   "end_distance_m": 346.0,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 214.9761348830302,
   "min_gradient_pct": -84.1368861441083,
   "suppressed_max_gradient_pct": 68.4600665337797,
   "suppressed_location_m": [
    1180.0,
    1182.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.02505916502317,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 344.0,
   "end_distance_m": 347.0,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 215.26163755848086,
   "min_gradient_pct": -80.53907844789971,
   "suppressed_max_gradient_pct": 66.02700943246494,
   "suppressed_location_m": [
    1179.0,
    1182.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.942129937679056,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 344.0,
   "end_distance_m": 349.0,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 215.86799228041411,
   "min_gradient_pct": -71.52249263692397,
   "suppressed_max_gradient_pct": 60.86389212413337,
   "suppressed_location_m": [
    1178.0,
    1183.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.94193929684991,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 339.0,
   "end_distance_m": 349.0,
   "start_elevation_m": 213.27379835072912,
   "end_elevation_m": 215.86799228041411,
   "min_gradient_pct": -55.5744411982613,
   "suppressed_max_gradient_pct": 59.54878643954601,
   "suppressed_location_m": [
    1178.0,
    1188.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.579621370238442,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 626.0,
   "end_distance_m": 646.0,
   "start_elevation_m": 246.66427201321792,
   "end_elevation_m": 250.9801962872656,
   "min_gradient_pct": -27.294087173291928,
   "suppressed_max_gradient_pct": 39.9961881598486,
   "suppressed_location_m": [
    1176.0,
    1196.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.326041904362796,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 629.0,
   "end_distance_m": 654.0,
   "start_elevation_m": 247.2775220687993,
   "end_elevation_m": 252.60903254489,
   "min_gradient_pct": -19.94191446956097,
   "suppressed_max_gradient_pct": 32.03354353749228,
   "suppressed_location_m": [
    1172.0,
    1197.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.30313985025407,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 607.0,
   "end_distance_m": 657.0,
   "start_elevation_m": 242.9763587728004,
   "end_elevation_m": 253.12792869792744,
   "min_gradient_pct": -5.4480060430952335
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.07457236153536,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 598.0,
   "end_distance_m": 698.0,
   "start_elevation_m": 241.61297551519763,
   "end_elevation_m": 259.687547876733,
   "min_gradient_pct": -0.09217623328231639
  }
 ],
 "shape": {
  "ascent_concentration": 0.337,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 152.0,
  "shape_class": "sustained"
 },
 "length_m": 1197.8521980471342,
 "start_elevation_m": 175.9728848730485,
 "end_elevation_m": 284.4437526313475,
 "endpoint_gain_m": 108.47086775829897,
 "overall_gradient_pct": 9.05544673500952,
 "accumulated_ascent_m": 116.74186277335019,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.942129937679056,
   "start_distance_m": 344.0,
   "end_distance_m": 349.0,
   "midpoint_distance_m": 346.5,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 215.86799228041411,
   "start_xy": [
    414885.9496421002,
    354916.4223263709
   ],
   "end_xy": [
    414890.81726718403,
    354917.5652288353
   ]
  },
  "max_10m": {
   "gradient_pct": 25.94193929684991,
   "start_distance_m": 339.0,
   "end_distance_m": 349.0,
   "midpoint_distance_m": 344.0,
   "start_elevation_m": 213.27379835072912,
   "end_elevation_m": 215.86799228041411,
   "start_xy": [
    414881.04760357155,
    354916.95573991333
   ],
   "end_xy": [
    414890.81726718403,
    354917.5652288353
   ]
  },
  "max_20m": {
   "gradient_pct": 21.579621370238442,
   "start_distance_m": 626.0,
   "end_distance_m": 646.0,
   "midpoint_distance_m": 636.0,
   "start_elevation_m": 246.66427201321792,
   "end_elevation_m": 250.9801962872656,
   "start_xy": [
    415142.5550168691,
    354858.0542270552
   ],
   "end_xy": [
    415162.5550167608,
    354858.05214510986
   ]
  },
  "max_25m": {
   "gradient_pct": 21.326041904362796,
   "start_distance_m": 629.0,
   "end_distance_m": 654.0,
   "midpoint_distance_m": 641.5,
   "start_elevation_m": 247.2775220687993,
   "end_elevation_m": 252.60903254489,
   "start_xy": [
    415145.55501685286,
    354858.0539147634
   ],
   "end_xy": [
    415170.4873907659,
    354857.109183191
   ]
  },
  "max_50m": {
   "gradient_pct": 20.30313985025407,
   "start_distance_m": 607.0,
   "end_distance_m": 657.0,
   "midpoint_distance_m": 632.0,
   "start_elevation_m": 242.9763587728004,
   "end_elevation_m": 253.12792869792744,
   "start_xy": [
    415123.55501697207,
    354858.0562049033
   ],
   "end_xy": [
    415173.45667967794,
    354856.6810204216
   ]
  },
  "max_100m": {
   "gradient_pct": 18.07457236153536,
   "start_distance_m": 598.0,
   "end_distance_m": 698.0,
   "midpoint_distance_m": 648.0,
   "start_elevation_m": 241.61297551519763,
   "end_elevation_m": 259.687547876733,
   "start_xy": [
    415114.7304129035,
    354858.7255871057
   ],
   "end_xy": [
    415213.59587359295,
    354849.0583258853
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -71.52249263692397,
   "start_distance_m": 1159.0,
   "end_distance_m": 1164.0,
   "midpoint_distance_m": 1161.5,
   "start_elevation_m": 280.96732572838135,
   "end_elevation_m": 277.39120109653516,
   "start_xy": [
    415475.1392295548,
    355070.74659409816
   ],
   "end_xy": [
    415474.18722966145,
    355075.65512709727
   ]
  },
  "min_10m": {
   "gradient_pct": -55.5744411982613,
   "start_distance_m": 1157.0,
   "end_distance_m": 1167.0,
   "midpoint_distance_m": 1162.0,
   "start_elevation_m": 281.9123030393635,
   "end_elevation_m": 276.3548589195374,
   "start_xy": [
    415475.5200295121,
    355068.7831808986
   ],
   "end_xy": [
    415473.6160297254,
    355078.60024689673
   ]
  },
  "min_20m": {
   "gradient_pct": -27.294087173291928,
   "start_distance_m": 1156.0,
   "end_distance_m": 1176.0,
   "midpoint_distance_m": 1166.0,
   "start_elevation_m": 281.88949978046907,
   "end_elevation_m": 276.4306823458107,
   "start_xy": [
    415475.6617494251,
    355067.79367622273
   ],
   "end_xy": [
    415471.9024299174,
    355087.43560629507
   ]
  },
  "min_25m": {
   "gradient_pct": -19.94191446956097,
   "start_distance_m": 1151.0,
   "end_distance_m": 1176.0,
   "midpoint_distance_m": 1163.5,
   "start_elevation_m": 281.4161609632009,
   "end_elevation_m": 276.4306823458107,
   "start_xy": [
    415476.2906399141,
    355062.83338421996
   ],
   "end_xy": [
    415471.9024299174,
    355087.43560629507
   ]
  },
  "min_50m": {
   "gradient_pct": -5.4480060430952335,
   "start_distance_m": 1126.0,
   "end_distance_m": 1176.0,
   "midpoint_distance_m": 1151.0,
   "start_elevation_m": 279.1546853673583,
   "end_elevation_m": 276.4306823458107,
   "start_xy": [
    415479.4350923591,
    355038.031924206
   ],
   "end_xy": [
    415471.9024299174,
    355087.43560629507
   ]
  },
  "min_100m": {
   "gradient_pct": -0.09217623328231639,
   "start_distance_m": 937.0,
   "end_distance_m": 1037.0,
   "midpoint_distance_m": 987.0,
   "start_elevation_m": 274.49310205721315,
   "end_elevation_m": 274.40092582393083,
   "start_xy": [
    415446.23685080564,
    354893.64768757124
   ],
   "end_xy": [
    415498.3724249711,
    354951.1913708634
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.262454975001845,
   "start_distance_m": 344.0,
   "end_distance_m": 346.0,
   "midpoint_distance_m": 345.0,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 214.9761348830302,
   "start_xy": [
    414885.9496421002,
    354916.4223263709
   ],
   "end_xy": [
    414887.89669213374,
    354916.87948735664
   ]
  },
  "max_3m": {
   "gradient_pct": 33.02505916502317,
   "start_distance_m": 344.0,
   "end_distance_m": 347.0,
   "midpoint_distance_m": 345.5,
   "start_elevation_m": 214.27088578353016,
   "end_elevation_m": 215.26163755848086,
   "start_xy": [
    414885.9496421002,
    354916.4223263709
   ],
   "end_xy": [
    414888.8702171505,
    354917.10806784953
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.039,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.073,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.24,
   "obstruction_max_height_m": 21.82,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    390.0,
    430.0
   ],
   [
    1151.0,
    1197.0
   ]
  ],
  "review": [],
  "extent": [
   "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/SK1050.tif",
   "data/cache/england/bulk_dtm_1m/SK1550.tif",
   "data/cache/england/bulk_dtm_1m/SK1055.tif",
   "data/cache/england/bulk_dtm_1m/SK1555.tif"
  ],
  "calculated_at": "2026-09-05T01:51:18+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/mnt/HC_Volume_106794610/hunt-gb/regions/region-01.osm.pbf",
  "osm_snapshot": "",
  "run_id": "hunt-england-260905",
  "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": [
   "SK1050.tif",
   "SK1550.tif",
   "SK1055.tif",
   "SK1555.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Mill Dale",
  "county": "Derbyshire"
 }
}