{
 "ocl_version": "0.1.0",
 "name": "Harwood Farm Lane",
 "slug": "harwood-farm-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 49.07148412086855,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 658.0,
   "end_distance_m": 660.0,
   "start_elevation_m": 170.46284675995386,
   "end_elevation_m": 171.44427644237123,
   "min_gradient_pct": -27.21454282347935
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 38.99069188177672,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 515.0,
   "end_distance_m": 518.0,
   "start_elevation_m": 156.91020513484366,
   "end_elevation_m": 158.07992589129697,
   "min_gradient_pct": -17.913786651685843,
   "suppressed_max_gradient_pct": 40.78284963743215,
   "suppressed_location_m": [
    666.0,
    669.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.40070984199622,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1002.0,
   "end_distance_m": 1007.0,
   "start_elevation_m": 208.97398220017516,
   "end_elevation_m": 210.69401769227497,
   "min_gradient_pct": -15.260537321493644
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.664786252508748,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1002.0,
   "end_distance_m": 1012.0,
   "start_elevation_m": 208.97398220017516,
   "end_elevation_m": 212.14046082542603,
   "min_gradient_pct": -12.240209399705577
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.91841646784718,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 992.0,
   "end_distance_m": 1012.0,
   "start_elevation_m": 206.5567775318566,
   "end_elevation_m": 212.14046082542603,
   "min_gradient_pct": -9.260923493074529
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.461819208783936,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 990.0,
   "end_distance_m": 1015.0,
   "start_elevation_m": 206.12806689309156,
   "end_elevation_m": 212.74352169528754,
   "min_gradient_pct": -7.859090790056257
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.63815955716143,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 982.0,
   "end_distance_m": 1032.0,
   "start_elevation_m": 204.8594556595095,
   "end_elevation_m": 215.17853543809022,
   "min_gradient_pct": -3.1200102172528545
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.545766256793144,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 929.0,
   "end_distance_m": 1029.0,
   "start_elevation_m": 198.42504238949113,
   "end_elevation_m": 214.97080864628427,
   "min_gradient_pct": -0.24223796665921782
  }
 ],
 "shape": {
  "ascent_concentration": 0.394,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 72.0,
  "shape_class": "sustained"
 },
 "length_m": 1706.0593867258835,
 "start_elevation_m": 116.52716309321582,
 "end_elevation_m": 243.4289340829447,
 "endpoint_gain_m": 126.90177098972887,
 "overall_gradient_pct": 7.4382973990880465,
 "accumulated_ascent_m": 138.5166115431108,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.40070984199622,
   "start_distance_m": 1002.0,
   "end_distance_m": 1007.0,
   "midpoint_distance_m": 1004.5,
   "start_elevation_m": 208.97398220017516,
   "end_elevation_m": 210.69401769227497,
   "start_xy": [
    307567.9306535806,
    130084.60138832945
   ],
   "end_xy": [
    307569.2708885944,
    130089.40776793168
   ]
  },
  "max_10m": {
   "gradient_pct": 31.664786252508748,
   "start_distance_m": 1002.0,
   "end_distance_m": 1012.0,
   "midpoint_distance_m": 1007.0,
   "start_elevation_m": 208.97398220017516,
   "end_elevation_m": 212.14046082542603,
   "start_xy": [
    307567.9306535806,
    130084.60138832945
   ],
   "end_xy": [
    307570.3971691667,
    130094.27926586069
   ]
  },
  "max_20m": {
   "gradient_pct": 27.91841646784718,
   "start_distance_m": 992.0,
   "end_distance_m": 1012.0,
   "midpoint_distance_m": 1002.0,
   "start_elevation_m": 206.5567775318566,
   "end_elevation_m": 212.14046082542603,
   "start_xy": [
    307564.37339311873,
    130075.25548559047
   ],
   "end_xy": [
    307570.3971691667,
    130094.27926586069
   ]
  },
  "max_25m": {
   "gradient_pct": 26.461819208783936,
   "start_distance_m": 990.0,
   "end_distance_m": 1015.0,
   "midpoint_distance_m": 1002.5,
   "start_elevation_m": 206.12806689309156,
   "end_elevation_m": 212.74352169528754,
   "start_xy": [
    307563.6619410264,
    130073.38630504267
   ],
   "end_xy": [
    307571.07293751015,
    130097.2021646181
   ]
  },
  "max_50m": {
   "gradient_pct": 20.63815955716143,
   "start_distance_m": 982.0,
   "end_distance_m": 1032.0,
   "midpoint_distance_m": 1007.0,
   "start_elevation_m": 204.8594556595095,
   "end_elevation_m": 215.17853543809022,
   "start_xy": [
    307560.54052098654,
    130066.03710845685
   ],
   "end_xy": [
    307574.9022914562,
    130113.76525757673
   ]
  },
  "max_100m": {
   "gradient_pct": 16.545766256793144,
   "start_distance_m": 929.0,
   "end_distance_m": 1029.0,
   "midpoint_distance_m": 979.0,
   "start_elevation_m": 198.42504238949113,
   "end_elevation_m": 214.97080864628427,
   "start_xy": [
    307534.4870801267,
    130020.25626588943
   ],
   "end_xy": [
    307574.22652311274,
    130110.84235881933
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.260537321493644,
   "start_distance_m": 1413.0,
   "end_distance_m": 1418.0,
   "midpoint_distance_m": 1415.5,
   "start_elevation_m": 241.03194733741773,
   "end_elevation_m": 240.26892047134305,
   "start_xy": [
    307413.06570596655,
    130437.65533147407
   ],
   "end_xy": [
    307410.6306397949,
    130442.02230442336
   ]
  },
  "min_10m": {
   "gradient_pct": -12.240209399705577,
   "start_distance_m": 1413.0,
   "end_distance_m": 1423.0,
   "midpoint_distance_m": 1418.0,
   "start_elevation_m": 241.03194733741773,
   "end_elevation_m": 239.80792639744718,
   "start_xy": [
    307413.06570596655,
    130437.65533147407
   ],
   "end_xy": [
    307408.42733454506,
    130446.50395048519
   ]
  },
  "min_20m": {
   "gradient_pct": -9.260923493074529,
   "start_distance_m": 1413.0,
   "end_distance_m": 1433.0,
   "midpoint_distance_m": 1423.0,
   "start_elevation_m": 241.03194733741773,
   "end_elevation_m": 239.17976263880283,
   "start_xy": [
    307413.06570596655,
    130437.65533147407
   ],
   "end_xy": [
    307404.4387104101,
    130455.67405830952
   ]
  },
  "min_25m": {
   "gradient_pct": -7.859090790056257,
   "start_distance_m": 1413.0,
   "end_distance_m": 1438.0,
   "midpoint_distance_m": 1425.5,
   "start_elevation_m": 241.03194733741773,
   "end_elevation_m": 239.06717463990367,
   "start_xy": [
    307413.06570596655,
    130437.65533147407
   ],
   "end_xy": [
    307402.44439834263,
    130460.25911222168
   ]
  },
  "min_50m": {
   "gradient_pct": -3.1200102172528545,
   "start_distance_m": 1413.0,
   "end_distance_m": 1463.0,
   "midpoint_distance_m": 1438.0,
   "start_elevation_m": 241.03194733741773,
   "end_elevation_m": 239.4719422287913,
   "start_xy": [
    307413.06570596655,
    130437.65533147407
   ],
   "end_xy": [
    307398.5851149832,
    130484.72029574399
   ]
  },
  "min_100m": {
   "gradient_pct": -0.24223796665921782,
   "start_distance_m": 1530.0,
   "end_distance_m": 1630.0,
   "midpoint_distance_m": 1580.0,
   "start_elevation_m": 242.5771583757924,
   "end_elevation_m": 242.3349204091332,
   "start_xy": [
    307406.54085624235,
    130549.47417140583
   ],
   "end_xy": [
    307455.76725536876,
    130636.48569319634
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 49.07148412086855,
   "start_distance_m": 658.0,
   "end_distance_m": 660.0,
   "midpoint_distance_m": 659.0,
   "start_elevation_m": 170.46284675995386,
   "end_elevation_m": 171.44427644237123,
   "start_xy": [
    307645.09050486295,
    129870.67674266343
   ],
   "end_xy": [
    307646.09823009116,
    129872.40431027845
   ]
  },
  "max_3m": {
   "gradient_pct": 38.99069188177672,
   "start_distance_m": 515.0,
   "end_distance_m": 518.0,
   "midpoint_distance_m": 516.5,
   "start_elevation_m": 156.91020513484366,
   "end_elevation_m": 158.07992589129697,
   "start_xy": [
    307631.137445333,
    129753.35143430246
   ],
   "end_xy": [
    307630.38046435284,
    129756.22824038674
   ]
  }
 },
 "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": 0.04,
   "obstruction_max_height_m": 19.06,
   "flagged_windows_m": [
    3
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    3.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    665.0,
    670.0
   ]
  ],
  "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/ST0525.tif",
   "data/cache/england/bulk_dtm_1m/ST0530.tif"
  ],
  "calculated_at": "2026-08-15T05:04:08+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": [
   "ST0525.tif",
   "ST0530.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.1% over 200 m (Terrain 50), gain 44.1 m over 784 m way. EXTENDED by graph walk: +3 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": "Langley Marsh",
  "county": "Somerset"
 }
}