{
 "ocl_version": "0.1.0",
 "name": "St. Lawrence Road",
 "slug": "st-lawrence-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.65826476380161,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 205.0,
   "end_distance_m": 207.0,
   "start_elevation_m": 47.80988243079803,
   "end_elevation_m": 48.64304772607406,
   "min_gradient_pct": -28.859944069014887
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 38.51781220002953,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 204.0,
   "end_distance_m": 207.0,
   "start_elevation_m": 47.48751336007317,
   "end_elevation_m": 48.64304772607406,
   "min_gradient_pct": -25.511716553499515
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.55662805257995,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 190.0,
   "end_distance_m": 195.0,
   "start_elevation_m": 44.56703617905786,
   "end_elevation_m": 46.344867581686856,
   "min_gradient_pct": -17.15004318226903
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.50955475778153,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 203.0,
   "end_distance_m": 213.0,
   "start_elevation_m": 47.26051399918667,
   "end_elevation_m": 50.311469474964824,
   "min_gradient_pct": -5.236573850909565
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.263061521420255,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 189.0,
   "end_distance_m": 209.0,
   "start_elevation_m": 44.39418198799437,
   "end_elevation_m": 49.24679429227842,
   "min_gradient_pct": -5.131683750271385
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.63114334166778,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 188.0,
   "end_distance_m": 213.0,
   "start_elevation_m": 44.15368363954788,
   "end_elevation_m": 50.311469474964824,
   "min_gradient_pct": -5.0350227098446965
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.20297020963376,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 168.0,
   "end_distance_m": 218.0,
   "start_elevation_m": 41.54570157639551,
   "end_elevation_m": 51.14718668121239,
   "min_gradient_pct": -4.450280750082101
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.036459884639584,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 218.0,
   "start_elevation_m": 35.110726796572806,
   "end_elevation_m": 51.14718668121239,
   "min_gradient_pct": -4.085376662632605
  }
 ],
 "shape": {
  "ascent_concentration": 0.535,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 174.0,
  "shape_class": "stepped"
 },
 "length_m": 1155.7699062786207,
 "start_elevation_m": 23.36793694946296,
 "end_elevation_m": 73.52950442980908,
 "endpoint_gain_m": 50.16156748034612,
 "overall_gradient_pct": 4.340099807742676,
 "accumulated_ascent_m": 61.85664963322821,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.55662805257995,
   "start_distance_m": 190.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 192.5,
   "start_elevation_m": 44.56703617905786,
   "end_elevation_m": 46.344867581686856,
   "start_xy": [
    204616.92755189442,
    66125.63883708724
   ],
   "end_xy": [
    204613.17008490083,
    66122.34013404028
   ]
  },
  "max_10m": {
   "gradient_pct": 30.50955475778153,
   "start_distance_m": 203.0,
   "end_distance_m": 213.0,
   "midpoint_distance_m": 208.0,
   "start_elevation_m": 47.26051399918667,
   "end_elevation_m": 50.311469474964824,
   "start_xy": [
    204607.15813771109,
    66117.06220916513
   ],
   "end_xy": [
    204599.5293860865,
    66110.602258879
   ]
  },
  "max_20m": {
   "gradient_pct": 24.263061521420255,
   "start_distance_m": 189.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 199.0,
   "start_elevation_m": 44.39418198799437,
   "end_elevation_m": 49.24679429227842,
   "start_xy": [
    204617.67904529313,
    66126.29857769664
   ],
   "end_xy": [
    204602.64917731876,
    66113.10376550877
   ]
  },
  "max_25m": {
   "gradient_pct": 24.63114334166778,
   "start_distance_m": 188.0,
   "end_distance_m": 213.0,
   "midpoint_distance_m": 200.5,
   "start_elevation_m": 44.15368363954788,
   "end_elevation_m": 50.311469474964824,
   "start_xy": [
    204618.43053869184,
    66126.95831830603
   ],
   "end_xy": [
    204599.5293860865,
    66110.602258879
   ]
  },
  "max_50m": {
   "gradient_pct": 19.20297020963376,
   "start_distance_m": 168.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 193.0,
   "start_elevation_m": 41.54570157639551,
   "end_elevation_m": 51.14718668121239,
   "start_xy": [
    204633.4604066662,
    66140.15313049391
   ],
   "end_xy": [
    204595.58780220753,
    66107.52591095897
   ]
  },
  "max_100m": {
   "gradient_pct": 16.036459884639584,
   "start_distance_m": 118.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 168.0,
   "start_elevation_m": 35.110726796572806,
   "end_elevation_m": 51.14718668121239,
   "start_xy": [
    204675.5155207613,
    66166.57658788582
   ],
   "end_xy": [
    204595.58780220753,
    66107.52591095897
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -17.15004318226903,
   "start_distance_m": 236.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 238.5,
   "start_elevation_m": 51.996148250580504,
   "end_elevation_m": 51.13864609146705,
   "start_xy": [
    204581.3981002432,
    66096.45105844691
   ],
   "end_xy": [
    204577.45651636424,
    66093.3747105269
   ]
  },
  "min_10m": {
   "gradient_pct": -5.236573850909565,
   "start_distance_m": 501.0,
   "end_distance_m": 511.0,
   "midpoint_distance_m": 506.0,
   "start_elevation_m": 51.61508245796494,
   "end_elevation_m": 51.09142507287398,
   "start_xy": [
    204374.78108396856,
    65932.42450377597
   ],
   "end_xy": [
    204366.72078575674,
    65926.50575452157
   ]
  },
  "min_20m": {
   "gradient_pct": -5.131683750271385,
   "start_distance_m": 488.0,
   "end_distance_m": 508.0,
   "midpoint_distance_m": 498.0,
   "start_elevation_m": 52.25894479212793,
   "end_elevation_m": 51.23260804207365,
   "start_xy": [
    204385.25947164392,
    65940.11887780669
   ],
   "end_xy": [
    204369.13887522026,
    65928.28137929788
   ]
  },
  "min_25m": {
   "gradient_pct": -5.0350227098446965,
   "start_distance_m": 486.0,
   "end_distance_m": 511.0,
   "midpoint_distance_m": 498.5,
   "start_elevation_m": 52.350180750335156,
   "end_elevation_m": 51.09142507287398,
   "start_xy": [
    204386.87153128628,
    65941.30262765757
   ],
   "end_xy": [
    204366.72078575674,
    65926.50575452157
   ]
  },
  "min_50m": {
   "gradient_pct": -4.450280750082101,
   "start_distance_m": 466.0,
   "end_distance_m": 516.0,
   "midpoint_distance_m": 491.0,
   "start_elevation_m": 53.133318971325856,
   "end_elevation_m": 50.908178596284806,
   "start_xy": [
    204402.48481400646,
    65953.77498497126
   ],
   "end_xy": [
    204362.6906366508,
    65923.54637989437
   ]
  },
  "min_100m": {
   "gradient_pct": -4.085376662632605,
   "start_distance_m": 408.0,
   "end_distance_m": 508.0,
   "midpoint_distance_m": 458.0,
   "start_elevation_m": 55.317984704706255,
   "end_elevation_m": 51.23260804207365,
   "start_xy": [
    204444.59529296958,
    65993.60448578528
   ],
   "end_xy": [
    204369.13887522026,
    65928.28137929788
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.65826476380161,
   "start_distance_m": 205.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 206.0,
   "start_elevation_m": 47.80988243079803,
   "end_elevation_m": 48.64304772607406,
   "start_xy": [
    204605.65515091363,
    66115.74272794634
   ],
   "end_xy": [
    204604.1521641162,
    66114.42324672756
   ]
  },
  "max_3m": {
   "gradient_pct": 38.51781220002953,
   "start_distance_m": 204.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 205.5,
   "start_elevation_m": 47.48751336007317,
   "end_elevation_m": 48.64304772607406,
   "start_xy": [
    204606.40664431237,
    66116.40246855574
   ],
   "end_xy": [
    204604.1521641162,
    66114.42324672756
   ]
  }
 },
 "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": 0.016,
   "obstruction_max_height_m": 9.95,
   "flagged_windows_m": []
  },
  "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/SX0065.tif"
  ],
  "calculated_at": "2026-08-14T23:57:28+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": [
   "SX0065.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.8% over 200 m (Terrain 50), gain 21.1 m over 697 m way. EXTENDED by graph walk: +1 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
  "place": "St Lawrence",
  "county": "Cornwall"
 }
}