{
 "ocl_version": "0.1.0",
 "name": "Plymbridge Road",
 "slug": "plymbridge-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 58.54296055470325,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 45.0,
   "end_distance_m": 47.0,
   "start_elevation_m": 10.442273637258413,
   "end_elevation_m": 11.613132848352478,
   "min_gradient_pct": -57.25365203058157
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 55.38964276387344,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 45.0,
   "end_distance_m": 48.0,
   "start_elevation_m": 10.442273637258413,
   "end_elevation_m": 12.103962920174617,
   "min_gradient_pct": -49.829232148229785
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 42.61598224983466,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 260.0,
   "end_distance_m": 265.0,
   "start_elevation_m": 20.36292429875287,
   "end_elevation_m": 22.493723411244602,
   "min_gradient_pct": -36.10727306926915,
   "suppressed_max_gradient_pct": 51.83764231898927,
   "suppressed_location_m": [
    45.0,
    50.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.09729875872103,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 261.0,
   "end_distance_m": 271.0,
   "start_elevation_m": 20.699500778500905,
   "end_elevation_m": 23.909230654373008,
   "min_gradient_pct": -15.166294416999051
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.79215023679227,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 256.0,
   "end_distance_m": 276.0,
   "start_elevation_m": 19.75178113438286,
   "end_elevation_m": 24.910211181741314,
   "min_gradient_pct": -12.152522070172367
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.651803758260797,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 258.0,
   "end_distance_m": 283.0,
   "start_elevation_m": 19.916205795412253,
   "end_elevation_m": 25.829156734977452,
   "min_gradient_pct": -11.364993490854602
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.445003278240137,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 703.0,
   "end_distance_m": 753.0,
   "start_elevation_m": 61.20115051261513,
   "end_elevation_m": 69.9236521517352,
   "min_gradient_pct": -10.924323845260373
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.602571057534519,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 234.0,
   "end_distance_m": 334.0,
   "start_elevation_m": 17.64920764945811,
   "end_elevation_m": 31.251778706992628,
   "min_gradient_pct": -10.061051836936194
  }
 ],
 "shape": {
  "ascent_concentration": 0.506,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 57.0,
  "shape_class": "stepped"
 },
 "length_m": 1650.6445578950193,
 "start_elevation_m": 9.581876749648776,
 "end_elevation_m": 57.27111691512856,
 "endpoint_gain_m": 47.68924016547978,
 "overall_gradient_pct": 2.88912836730249,
 "accumulated_ascent_m": 91.69361879703112,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 42.61598224983466,
   "start_distance_m": 260.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 262.5,
   "start_elevation_m": 20.36292429875287,
   "end_elevation_m": 22.493723411244602,
   "start_xy": [
    252574.9501746723,
    58565.86197075922
   ],
   "end_xy": [
    252579.75940014696,
    58564.49399768428
   ]
  },
  "max_10m": {
   "gradient_pct": 32.09729875872103,
   "start_distance_m": 261.0,
   "end_distance_m": 271.0,
   "midpoint_distance_m": 266.0,
   "start_elevation_m": 20.699500778500905,
   "end_elevation_m": 23.909230654373008,
   "start_xy": [
    252575.91201976722,
    58565.58837614423
   ],
   "end_xy": [
    252585.53047071656,
    58562.85242999436
   ]
  },
  "max_20m": {
   "gradient_pct": 25.79215023679227,
   "start_distance_m": 256.0,
   "end_distance_m": 276.0,
   "midpoint_distance_m": 266.0,
   "start_elevation_m": 19.75178113438286,
   "end_elevation_m": 24.910211181741314,
   "start_xy": [
    252571.08066194484,
    58566.8072468439
   ],
   "end_xy": [
    252590.33969619125,
    58561.48445691942
   ]
  },
  "max_25m": {
   "gradient_pct": 23.651803758260797,
   "start_distance_m": 258.0,
   "end_distance_m": 283.0,
   "midpoint_distance_m": 270.5,
   "start_elevation_m": 19.916205795412253,
   "end_elevation_m": 25.829156734977452,
   "start_xy": [
    252573.02648448243,
    58566.4091599892
   ],
   "end_xy": [
    252597.2633657971,
    58560.48818501847
   ]
  },
  "max_50m": {
   "gradient_pct": 17.445003278240137,
   "start_distance_m": 703.0,
   "end_distance_m": 753.0,
   "midpoint_distance_m": 728.0,
   "start_elevation_m": 61.20115051261513,
   "end_elevation_m": 69.9236521517352,
   "start_xy": [
    252828.02391573467,
    58272.08359475679
   ],
   "end_xy": [
    252826.6061904848,
    58222.103698247134
   ]
  },
  "max_100m": {
   "gradient_pct": 13.602571057534519,
   "start_distance_m": 234.0,
   "end_distance_m": 334.0,
   "midpoint_distance_m": 284.0,
   "start_elevation_m": 17.64920764945811,
   "end_elevation_m": 31.251778706992628,
   "start_xy": [
    252549.08406698113,
    58567.194299815856
   ],
   "end_xy": [
    252646.898292617,
    58549.360566962496
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -36.10727306926915,
   "start_distance_m": 50.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 52.5,
   "start_elevation_m": 13.034155753207877,
   "end_elevation_m": 11.22879209974442,
   "start_xy": [
    252407.91028572817,
    58653.204280782455
   ],
   "end_xy": [
    252409.8370776139,
    58648.590445823436
   ]
  },
  "min_10m": {
   "gradient_pct": -15.166294416999051,
   "start_distance_m": 1462.0,
   "end_distance_m": 1472.0,
   "midpoint_distance_m": 1467.0,
   "start_elevation_m": 75.22559606308181,
   "end_elevation_m": 73.7089666213819,
   "start_xy": [
    253041.71044678483,
    57569.343943910775
   ],
   "end_xy": [
    253047.86427104866,
    57561.46165700087
   ]
  },
  "min_20m": {
   "gradient_pct": -12.152522070172367,
   "start_distance_m": 1537.0,
   "end_distance_m": 1557.0,
   "midpoint_distance_m": 1547.0,
   "start_elevation_m": 68.66829458066758,
   "end_elevation_m": 66.2377901666331,
   "start_xy": [
    253086.8579518139,
    57509.50761880328
   ],
   "end_xy": [
    253097.24801716994,
    57492.47987550799
   ]
  },
  "min_25m": {
   "gradient_pct": -11.364993490854602,
   "start_distance_m": 1535.0,
   "end_distance_m": 1560.0,
   "midpoint_distance_m": 1547.5,
   "start_elevation_m": 68.83395126646427,
   "end_elevation_m": 65.99270289375062,
   "start_xy": [
    253085.76482723036,
    57511.18245570426
   ],
   "end_xy": [
    253099.22453149236,
    57490.223021251884
   ]
  },
  "min_50m": {
   "gradient_pct": -10.924323845260373,
   "start_distance_m": 1536.0,
   "end_distance_m": 1586.0,
   "midpoint_distance_m": 1561.0,
   "start_elevation_m": 68.78973375325255,
   "end_elevation_m": 63.32757183062236,
   "start_xy": [
    253086.31138952213,
    57510.34503725377
   ],
   "end_xy": [
    253119.32786119636,
    57473.81209246274
   ]
  },
  "min_100m": {
   "gradient_pct": -10.061051836936194,
   "start_distance_m": 1536.0,
   "end_distance_m": 1636.0,
   "midpoint_distance_m": 1586.0,
   "start_elevation_m": 68.78973375325255,
   "end_elevation_m": 58.728681916316354,
   "start_xy": [
    253086.31138952213,
    57510.34503725377
   ],
   "end_xy": [
    253153.62570884818,
    57437.56460340486
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 58.54296055470325,
   "start_distance_m": 45.0,
   "end_distance_m": 47.0,
   "midpoint_distance_m": 46.0,
   "start_elevation_m": 10.442273637258413,
   "end_elevation_m": 11.613132848352478,
   "start_xy": [
    252405.98349384242,
    58657.818115741466
   ],
   "end_xy": [
    252406.7542105967,
    58655.97258175786
   ]
  },
  "max_3m": {
   "gradient_pct": 55.38964276387344,
   "start_distance_m": 45.0,
   "end_distance_m": 48.0,
   "midpoint_distance_m": 46.5,
   "start_elevation_m": 10.442273637258413,
   "end_elevation_m": 12.103962920174617,
   "start_xy": [
    252405.98349384242,
    58657.818115741466
   ],
   "end_xy": [
    252407.13956897386,
    58655.04981476606
   ]
  }
 },
 "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": 0.084,
   "obstruction_max_height_m": 18.24,
   "flagged_windows_m": [
    2,
    3,
    5
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.007,
   "windows_resited": [
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    49.0,
    54.0
   ],
   [
    392.0,
    397.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 1188.0,
  "trailing_descent_m": 31.1
 },
 "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/SX5055.tif"
  ],
  "calculated_at": "2026-08-15T01:17:08+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": [
   "SX5055.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.1% over 200 m (Terrain 50), gain 45.1 m over 1581 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": "Mainstone",
  "county": "City of Plymouth"
 }
}