{
 "ocl_version": "0.1.0",
 "name": "Aveton Gifford to Easton",
 "slug": "discovered-lane-50-3062-3-8534",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 50.72498814423163,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 149.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 18.10309188910464,
   "end_elevation_m": 19.117591651989272,
   "min_gradient_pct": -44.16623588859121
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 48.13365692389908,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 163.0,
   "end_distance_m": 166.0,
   "start_elevation_m": 20.234288855218832,
   "end_elevation_m": 21.678298562935804,
   "min_gradient_pct": -30.353536329747637
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 43.11347424564303,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 162.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 19.849471595018855,
   "end_elevation_m": 22.005145307301007,
   "min_gradient_pct": -20.20562020313463
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 38.47749009674054,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 163.0,
   "end_distance_m": 173.0,
   "start_elevation_m": 20.234288855218832,
   "end_elevation_m": 24.082037864892886,
   "min_gradient_pct": -15.452312548763667
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.688187467368987,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 98.0,
   "end_distance_m": 118.0,
   "start_elevation_m": 10.952339880027784,
   "end_elevation_m": 16.48997737350158,
   "min_gradient_pct": -0.01878791041526995
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.580919483021766,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 97.0,
   "end_distance_m": 122.0,
   "start_elevation_m": 10.813419560371399,
   "end_elevation_m": 17.20864943112684,
   "min_gradient_pct": 0.07990263932293828
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.378194188366837,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 133.0,
   "end_distance_m": 183.0,
   "start_elevation_m": 15.820686648719443,
   "end_elevation_m": 25.50978374290286,
   "min_gradient_pct": 0.40621887626758735,
   "suppressed_max_gradient_pct": 19.55662063902256,
   "suppressed_location_m": [
    137.0,
    187.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.438449519456086,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 83.0,
   "end_distance_m": 183.0,
   "start_elevation_m": 9.071334223446774,
   "end_elevation_m": 25.50978374290286,
   "min_gradient_pct": 0.694110816945809,
   "suppressed_max_gradient_pct": 16.653294244779232,
   "suppressed_location_m": [
    88.0,
    188.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.437,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 134.0,
  "shape_class": "sustained"
 },
 "length_m": 1400.2522810283297,
 "start_elevation_m": 2.753380876643649,
 "end_elevation_m": 120.62128593902575,
 "endpoint_gain_m": 117.8679050623821,
 "overall_gradient_pct": 8.417619214719025,
 "accumulated_ascent_m": 123.01196064356361,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 43.11347424564303,
   "start_distance_m": 162.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 164.5,
   "start_elevation_m": 19.849471595018855,
   "end_elevation_m": 22.005145307301007,
   "start_xy": [
    268173.3444771629,
    46759.32386462122
   ],
   "end_xy": [
    268168.43679657165,
    46760.2802490705
   ]
  },
  "max_10m": {
   "gradient_pct": 38.47749009674054,
   "start_distance_m": 163.0,
   "end_distance_m": 173.0,
   "midpoint_distance_m": 168.0,
   "start_elevation_m": 20.234288855218832,
   "end_elevation_m": 24.082037864892886,
   "start_xy": [
    268172.3629410446,
    46759.515141511074
   ],
   "end_xy": [
    268162.54757986224,
    46761.427910409635
   ]
  },
  "max_20m": {
   "gradient_pct": 27.688187467368987,
   "start_distance_m": 98.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 108.0,
   "start_elevation_m": 10.952339880027784,
   "end_elevation_m": 16.48997737350158,
   "start_xy": [
    268175.32068029215,
    46704.25751904209
   ],
   "end_xy": [
    268174.3279935787,
    46723.59867391429
   ]
  },
  "max_25m": {
   "gradient_pct": 25.580919483021766,
   "start_distance_m": 97.0,
   "end_distance_m": 122.0,
   "midpoint_distance_m": 109.5,
   "start_elevation_m": 10.813419560371399,
   "end_elevation_m": 17.20864943112684,
   "start_xy": [
    268175.697935111,
    46703.33140954444
   ],
   "end_xy": [
    268175.6894960933,
    46727.359832100614
   ]
  },
  "max_50m": {
   "gradient_pct": 19.378194188366837,
   "start_distance_m": 133.0,
   "end_distance_m": 183.0,
   "midpoint_distance_m": 158.0,
   "start_elevation_m": 15.820686648719443,
   "end_elevation_m": 25.50978374290286,
   "start_xy": [
    268179.4336280087,
    46737.703017113
   ],
   "end_xy": [
    268152.73221867986,
    46763.3406793082
   ]
  },
  "max_100m": {
   "gradient_pct": 16.438449519456086,
   "start_distance_m": 83.0,
   "end_distance_m": 183.0,
   "midpoint_distance_m": 133.0,
   "start_elevation_m": 9.071334223446774,
   "end_elevation_m": 25.50978374290286,
   "start_xy": [
    268182.7690033646,
    46691.57902393573
   ],
   "end_xy": [
    268152.73221867986,
    46763.3406793082
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.20562020313463,
   "start_distance_m": 125.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 127.5,
   "start_elevation_m": 17.476573001751333,
   "end_elevation_m": 16.466291991594602,
   "start_xy": [
    268176.7106229793,
    46730.180700740355
   ],
   "end_xy": [
    268178.4125011227,
    46734.88214847326
   ]
  },
  "min_10m": {
   "gradient_pct": -15.452312548763667,
   "start_distance_m": 124.0,
   "end_distance_m": 134.0,
   "midpoint_distance_m": 129.0,
   "start_elevation_m": 17.50446051907815,
   "end_elevation_m": 15.959229264201785,
   "start_xy": [
    268176.37024735066,
    46729.24041119378
   ],
   "end_xy": [
    268179.7740036374,
    46738.643306659586
   ]
  },
  "min_20m": {
   "gradient_pct": -0.01878791041526995,
   "start_distance_m": 117.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 127.0,
   "start_elevation_m": 16.340583360258265,
   "end_elevation_m": 16.33682577817521,
   "start_xy": [
    268173.98761795,
    46722.658384367714
   ],
   "end_xy": [
    268180.6344138448,
    46741.50988023592
   ]
  },
  "min_25m": {
   "gradient_pct": 0.07990263932293828,
   "start_distance_m": 1297.0,
   "end_distance_m": 1322.0,
   "midpoint_distance_m": 1309.5,
   "start_elevation_m": 119.8685724997843,
   "end_elevation_m": 119.88854815961504,
   "start_xy": [
    267102.0454599642,
    46829.69622807619
   ],
   "end_xy": [
    267077.1576824267,
    46827.330106937065
   ]
  },
  "min_50m": {
   "gradient_pct": 0.40621887626758735,
   "start_distance_m": 1295.0,
   "end_distance_m": 1345.0,
   "midpoint_distance_m": 1320.0,
   "start_elevation_m": 119.87308980697662,
   "end_elevation_m": 120.07619924511042,
   "start_xy": [
    267104.0364821672,
    46829.88551776732
   ],
   "end_xy": [
    267054.1953229118,
    46826.14855947087
   ]
  },
  "min_100m": {
   "gradient_pct": 0.694110816945809,
   "start_distance_m": 1295.0,
   "end_distance_m": 1395.0,
   "midpoint_distance_m": 1345.0,
   "start_elevation_m": 119.87308980697662,
   "end_elevation_m": 120.56720062392243,
   "start_xy": [
    267104.0364821672,
    46829.88551776732
   ],
   "end_xy": [
    267004.23698309256,
    46826.218151686226
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 50.72498814423163,
   "start_distance_m": 149.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 150.0,
   "start_elevation_m": 18.10309188910464,
   "end_elevation_m": 19.117591651989272,
   "start_xy": [
    268183.0985831319,
    46753.254149890716
   ],
   "end_xy": [
    268182.8824943516,
    46755.13411358162
   ]
  },
  "max_3m": {
   "gradient_pct": 48.13365692389908,
   "start_distance_m": 163.0,
   "end_distance_m": 166.0,
   "midpoint_distance_m": 164.5,
   "start_elevation_m": 20.234288855218832,
   "end_elevation_m": 21.678298562935804,
   "start_xy": [
    268172.3629410446,
    46759.515141511074
   ],
   "end_xy": [
    268169.4183326899,
    46760.088972180645
   ]
  }
 },
 "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": 0.041,
   "obstruction_max_height_m": 14.6,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    186.0,
    191.0
   ]
  ],
  "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/SX6545.tif"
  ],
  "calculated_at": "2026-08-15T01:02:01+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-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": [
   "SX6545.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.0% over 200 m (Terrain 50), gain 21.9 m over 167 m way. EXTENDED by graph walk: +3 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): stakes-hill",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.3062, -3.8534)'"
 },
 "area": {
  "place": "Aveton Gifford",
  "county": "Devon"
 }
}