{
 "ocl_version": "0.1.0",
 "name": "Lane near Dolanog",
 "slug": "discovered-lane-52-6949-3-3717",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.90275513135441,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 427.0,
   "end_distance_m": 429.0,
   "start_elevation_m": 185.52901222161282,
   "end_elevation_m": 186.1870673242399,
   "min_gradient_pct": -23.02338798820074,
   "suppressed_max_gradient_pct": 91.84768729064103,
   "suppressed_location_m": [
    1.0,
    3.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.47761492676754,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 425.0,
   "end_distance_m": 428.0,
   "start_elevation_m": 185.1211730535918,
   "end_elevation_m": 185.94550150139483,
   "min_gradient_pct": -19.535567131777043,
   "suppressed_max_gradient_pct": 91.34642814109289,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.95963042705648,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 424.0,
   "end_distance_m": 429.0,
   "start_elevation_m": 184.88908580288708,
   "end_elevation_m": 186.1870673242399,
   "min_gradient_pct": -17.120575682049548,
   "suppressed_max_gradient_pct": 74.93171707531417,
   "suppressed_location_m": [
    0.0,
    5.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.484137954737378,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 419.0,
   "end_distance_m": 429.0,
   "start_elevation_m": 183.93865352876617,
   "end_elevation_m": 186.1870673242399,
   "min_gradient_pct": -14.741363900251372,
   "suppressed_max_gradient_pct": 35.48567000766326,
   "suppressed_location_m": [
    0.0,
    10.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.739928494435702,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 419.0,
   "end_distance_m": 439.0,
   "start_elevation_m": 183.93865352876617,
   "end_elevation_m": 188.0866392276533,
   "min_gradient_pct": -13.880884713709634
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.532557231073838,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2294.0,
   "end_distance_m": 2319.0,
   "start_elevation_m": 185.69315251221354,
   "end_elevation_m": 190.826291819982,
   "min_gradient_pct": -13.749872288858569
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.457565888629233,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 400.0,
   "end_distance_m": 450.0,
   "start_elevation_m": 180.7242506132487,
   "end_elevation_m": 189.95303355756332,
   "min_gradient_pct": -12.875737191064559
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.472477457891474,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 374.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 177.35023750250556,
   "end_elevation_m": 192.82271496039704,
   "min_gradient_pct": -11.998858416339116
  }
 ],
 "length_m": 3249.002106603556,
 "start_elevation_m": 144.24773251343575,
 "end_elevation_m": 185.8161005290223,
 "endpoint_gain_m": 41.56836801558654,
 "overall_gradient_pct": 1.2794195464231728,
 "accumulated_ascent_m": 132.0759630579646,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.95963042705648,
   "start_distance_m": 424.0,
   "end_distance_m": 429.0,
   "midpoint_distance_m": 426.5,
   "start_elevation_m": 184.88908580288708,
   "end_elevation_m": 186.1870673242399,
   "start_xy": [
    306892.9782776079,
    312411.56200167764
   ],
   "end_xy": [
    306896.48842057894,
    312408.0012578898
   ]
  },
  "max_10m": {
   "gradient_pct": 22.484137954737378,
   "start_distance_m": 419.0,
   "end_distance_m": 429.0,
   "midpoint_distance_m": 424.0,
   "start_elevation_m": 183.93865352876617,
   "end_elevation_m": 186.1870673242399,
   "start_xy": [
    306889.4681346369,
    312415.12274546555
   ],
   "end_xy": [
    306896.48842057894,
    312408.0012578898
   ]
  },
  "max_20m": {
   "gradient_pct": 20.739928494435702,
   "start_distance_m": 419.0,
   "end_distance_m": 439.0,
   "midpoint_distance_m": 429.0,
   "start_elevation_m": 183.93865352876617,
   "end_elevation_m": 188.0866392276533,
   "start_xy": [
    306889.4681346369,
    312415.12274546555
   ],
   "end_xy": [
    306903.508706521,
    312400.87977031403
   ]
  },
  "max_25m": {
   "gradient_pct": 20.532557231073838,
   "start_distance_m": 2294.0,
   "end_distance_m": 2319.0,
   "midpoint_distance_m": 2306.5,
   "start_elevation_m": 185.69315251221354,
   "end_elevation_m": 190.826291819982,
   "start_xy": [
    307783.9964383891,
    311007.8937806591
   ],
   "end_xy": [
    307760.86330249824,
    310998.41443343187
   ]
  },
  "max_50m": {
   "gradient_pct": 18.457565888629233,
   "start_distance_m": 400.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 425.0,
   "start_elevation_m": 180.7242506132487,
   "end_elevation_m": 189.95303355756332,
   "start_xy": [
    306873.71774249274,
    312425.6058654872
   ],
   "end_xy": [
    306911.2310210573,
    312393.0461339807
   ]
  },
  "max_100m": {
   "gradient_pct": 15.472477457891474,
   "start_distance_m": 374.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 424.0,
   "start_elevation_m": 177.35023750250556,
   "end_elevation_m": 192.82271496039704,
   "start_xy": [
    306850.9774674477,
    312438.04579129623
   ],
   "end_xy": [
    306928.0797073182,
    312375.95456379885
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -17.120575682049548,
   "start_distance_m": 1340.0,
   "end_distance_m": 1345.0,
   "midpoint_distance_m": 1342.5,
   "start_elevation_m": 188.0226309412024,
   "end_elevation_m": 187.16660215709993,
   "start_xy": [
    307336.76462818455,
    311741.0047646459
   ],
   "end_xy": [
    307341.13750509743,
    311738.5803167696
   ]
  },
  "min_10m": {
   "gradient_pct": -14.741363900251372,
   "start_distance_m": 1358.0,
   "end_distance_m": 1368.0,
   "midpoint_distance_m": 1363.0,
   "start_elevation_m": 185.98832135105033,
   "end_elevation_m": 184.5141849610252,
   "start_xy": [
    307351.96018524416,
    311731.56603415083
   ],
   "end_xy": [
    307358.8889923366,
    311724.3555118205
   ]
  },
  "min_20m": {
   "gradient_pct": -13.880884713709634,
   "start_distance_m": 1282.0,
   "end_distance_m": 1302.0,
   "midpoint_distance_m": 1292.0,
   "start_elevation_m": 194.87859095285984,
   "end_elevation_m": 192.1024140101179,
   "start_xy": [
    307286.33517152915,
    311769.6334585119
   ],
   "end_xy": [
    307303.5307636467,
    311759.43056850566
   ]
  },
  "min_25m": {
   "gradient_pct": -13.749872288858569,
   "start_distance_m": 1283.0,
   "end_distance_m": 1308.0,
   "midpoint_distance_m": 1295.5,
   "start_elevation_m": 194.7641400239482,
   "end_elevation_m": 191.32667195173354,
   "start_xy": [
    307287.1857700191,
    311769.1076427562
   ],
   "end_xy": [
    307308.77821594215,
    311756.5212310541
   ]
  },
  "min_50m": {
   "gradient_pct": -12.875737191064559,
   "start_distance_m": 1276.0,
   "end_distance_m": 1326.0,
   "midpoint_distance_m": 1301.0,
   "start_elevation_m": 195.6166174018485,
   "end_elevation_m": 189.1787488063162,
   "start_xy": [
    307281.23158058967,
    311772.7883530461
   ],
   "end_xy": [
    307324.5205728285,
    311747.79321869946
   ]
  },
  "min_100m": {
   "gradient_pct": -11.998858416339116,
   "start_distance_m": 1271.0,
   "end_distance_m": 1371.0,
   "midpoint_distance_m": 1321.0,
   "start_elevation_m": 196.16679963377382,
   "end_elevation_m": 184.1679412174347,
   "start_xy": [
    307276.97858814005,
    311775.4174318246
   ],
   "end_xy": [
    307360.9676344643,
    311722.1923551214
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.90275513135441,
   "start_distance_m": 427.0,
   "end_distance_m": 429.0,
   "midpoint_distance_m": 428.0,
   "start_elevation_m": 185.52901222161282,
   "end_elevation_m": 186.1870673242399,
   "start_xy": [
    306895.0843633905,
    312409.4255554049
   ],
   "end_xy": [
    306896.48842057894,
    312408.0012578898
   ]
  },
  "max_3m": {
   "gradient_pct": 27.47761492676754,
   "start_distance_m": 425.0,
   "end_distance_m": 428.0,
   "midpoint_distance_m": 426.5,
   "start_elevation_m": 185.1211730535918,
   "end_elevation_m": 185.94550150139483,
   "start_xy": [
    306893.6803062021,
    312410.8498529201
   ],
   "end_xy": [
    306895.78639198473,
    312408.7134066473
   ]
  }
 },
 "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": 0.178,
   "obstruction_max_height_m": 24.23,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_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/wales/dtm_1m/wg_del_13_306310_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_307310_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_306311_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_306312_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_307311_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_307312_20210222dtm.tif"
  ],
  "calculated_at": "2026-08-12T01:20:05+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
   "wg_del_13_306310_20210222dtm.tif",
   "wg_del_13_307310_20210222dtm.tif",
   "wg_del_8_306311_20210222dtm.tif",
   "wg_del_8_306312_20210222dtm.tif",
   "wg_del_8_307311_20210222dtm.tif",
   "wg_del_8_307312_20210222dtm.tif"
  ],
  "elevation_capture_dates": [
   "16-03-2021",
   "22-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.9% over 200 m (Terrain 50), gain 38.6 m over 3222 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.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.6949, -3.3717)'"
 },
 "area": {
  "place": "Dolanog",
  "county": "Powys - Powys"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.537,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 114.0,
  "shape_class": "stepped"
 }
}