{
 "ocl_version": "0.1.0",
 "name": "Lane near Rhyd-Meirionnydd",
 "slug": "lane-near-rhyd-meirionnydd",
 "reported_claims": [
  {
   "source_name": "OSM incline tag 25% (editors=1, first tagged 2019-04-24)",
   "value_pct": 25.0,
   "evidence_type": "mapper_estimate",
   "claimed_window_m": null,
   "observed_via": "osm_tag_history"
  }
 ],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.060287475614814,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1599.0,
   "end_distance_m": 1601.0,
   "start_elevation_m": 64.99775872919406,
   "end_elevation_m": 65.41896447870636,
   "min_gradient_pct": -16.959873225468414
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 19.667510901874152,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1600.0,
   "end_distance_m": 1603.0,
   "start_elevation_m": 65.1656276223876,
   "end_elevation_m": 65.75565294944383,
   "min_gradient_pct": -10.960460250316828
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 17.256495881537717,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1599.0,
   "end_distance_m": 1604.0,
   "start_elevation_m": 64.99775872919406,
   "end_elevation_m": 65.86058352327095,
   "min_gradient_pct": -10.526041391858882
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 15.565898371329183,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1584.0,
   "end_distance_m": 1594.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 64.46897663834986,
   "min_gradient_pct": -9.956437923980275
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 14.740983610270035,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1584.0,
   "end_distance_m": 1604.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 65.86058352327095,
   "min_gradient_pct": -9.277631455917543
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 13.902446125310489,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1577.0,
   "end_distance_m": 1602.0,
   "start_elevation_m": 62.105048392676814,
   "end_elevation_m": 65.58065992400444,
   "min_gradient_pct": -9.052656961976766
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 12.61385507264896,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2649.0,
   "end_distance_m": 2699.0,
   "start_elevation_m": 65.72336976656399,
   "end_elevation_m": 72.03029730288847,
   "min_gradient_pct": -8.383349831179714
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.312851593740133,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1584.0,
   "end_distance_m": 1684.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 75.22523839495707,
   "min_gradient_pct": -7.146553636747526
  }
 ],
 "shape": {
  "ascent_concentration": 0.338,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 100.0,
  "shape_class": "sustained"
 },
 "length_m": 4089.999999999987,
 "start_elevation_m": 12.244505974254686,
 "end_elevation_m": 128.7410029715906,
 "endpoint_gain_m": 116.49649699733592,
 "overall_gradient_pct": 2.848325109959323,
 "accumulated_ascent_m": 154.6936683842669,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 17.256495881537717,
   "start_distance_m": 1599.0,
   "end_distance_m": 1604.0,
   "midpoint_distance_m": 1601.5,
   "start_elevation_m": 64.99775872919406,
   "end_elevation_m": 65.86058352327095,
   "start_xy": [
    259952.395038719,
    285464.92618841724
   ],
   "end_xy": [
    259953.9815292234,
    285469.66781766043
   ]
  },
  "max_10m": {
   "gradient_pct": 15.565898371329183,
   "start_distance_m": 1584.0,
   "end_distance_m": 1594.0,
   "midpoint_distance_m": 1589.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 64.46897663834986,
   "start_xy": [
    259947.63556720584,
    285450.7013006878
   ],
   "end_xy": [
    259950.8085482146,
    285460.1845591741
   ]
  },
  "max_20m": {
   "gradient_pct": 14.740983610270035,
   "start_distance_m": 1584.0,
   "end_distance_m": 1604.0,
   "midpoint_distance_m": 1594.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 65.86058352327095,
   "start_xy": [
    259947.63556720584,
    285450.7013006878
   ],
   "end_xy": [
    259953.9815292234,
    285469.66781766043
   ]
  },
  "max_25m": {
   "gradient_pct": 13.902446125310489,
   "start_distance_m": 1577.0,
   "end_distance_m": 1602.0,
   "midpoint_distance_m": 1589.5,
   "start_elevation_m": 62.105048392676814,
   "end_elevation_m": 65.58065992400444,
   "start_xy": [
    259944.33959528556,
    285444.53244113474
   ],
   "end_xy": [
    259953.34693302165,
    285467.77116596315
   ]
  },
  "max_50m": {
   "gradient_pct": 12.61385507264896,
   "start_distance_m": 2649.0,
   "end_distance_m": 2699.0,
   "midpoint_distance_m": 2674.0,
   "start_elevation_m": 65.72336976656399,
   "end_elevation_m": 72.03029730288847,
   "start_xy": [
    260066.26881238236,
    286477.86679159256
   ],
   "end_xy": [
    260056.81132281144,
    286526.6862553148
   ]
  },
  "max_100m": {
   "gradient_pct": 12.312851593740133,
   "start_distance_m": 1584.0,
   "end_distance_m": 1684.0,
   "midpoint_distance_m": 1634.0,
   "start_elevation_m": 62.91238680121694,
   "end_elevation_m": 75.22523839495707,
   "start_xy": [
    259947.63556720584,
    285450.7013006878
   ],
   "end_xy": [
    259946.22866713908,
    285547.59695392323
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.526041391858882,
   "start_distance_m": 2029.0,
   "end_distance_m": 2034.0,
   "midpoint_distance_m": 2031.5,
   "start_elevation_m": 87.25978549451085,
   "end_elevation_m": 86.7334834249179,
   "start_xy": [
    260037.3783129811,
    285874.6162844789
   ],
   "end_xy": [
    260037.3362514081,
    285879.61520699284
   ]
  },
  "min_10m": {
   "gradient_pct": -9.956437923980275,
   "start_distance_m": 2574.0,
   "end_distance_m": 2584.0,
   "midpoint_distance_m": 2579.0,
   "start_elevation_m": 67.1792141341854,
   "end_elevation_m": 66.18357034178737,
   "start_xy": [
    260069.4043980779,
    286403.15987242485
   ],
   "end_xy": [
    260070.39210428618,
    286413.11097469775
   ]
  },
  "min_20m": {
   "gradient_pct": -9.277631455917543,
   "start_distance_m": 2029.0,
   "end_distance_m": 2049.0,
   "midpoint_distance_m": 2039.0,
   "start_elevation_m": 87.25978549451085,
   "end_elevation_m": 85.40425920332734,
   "start_xy": [
    260037.3783129811,
    285874.6162844789
   ],
   "end_xy": [
    260037.0413184874,
    285894.6123071983
   ]
  },
  "min_25m": {
   "gradient_pct": -9.052656961976766,
   "start_distance_m": 2028.0,
   "end_distance_m": 2053.0,
   "midpoint_distance_m": 2040.5,
   "start_elevation_m": 87.32109761719771,
   "end_elevation_m": 85.05793337670352,
   "start_xy": [
    260037.35470899343,
    285873.61656309187
   ],
   "end_xy": [
    260036.96266970856,
    285898.61153391976
   ]
  },
  "min_50m": {
   "gradient_pct": -8.383349831179714,
   "start_distance_m": 2029.0,
   "end_distance_m": 2079.0,
   "midpoint_distance_m": 2054.0,
   "start_elevation_m": 87.25978549451085,
   "end_elevation_m": 83.068110578921,
   "start_xy": [
    260037.3783129811,
    285874.6162844789
   ],
   "end_xy": [
    260036.451452646,
    285924.6065076092
   ]
  },
  "min_100m": {
   "gradient_pct": -7.146553636747526,
   "start_distance_m": 2026.0,
   "end_distance_m": 2126.0,
   "midpoint_distance_m": 2076.0,
   "start_elevation_m": 87.46240493746302,
   "end_elevation_m": 80.3158513007155,
   "start_xy": [
    260037.3075010181,
    285871.6171203177
   ],
   "end_xy": [
    260034.744373219,
    285971.57527354866
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.060287475614814,
   "start_distance_m": 1599.0,
   "end_distance_m": 1601.0,
   "midpoint_distance_m": 1600.0,
   "start_elevation_m": 64.99775872919406,
   "end_elevation_m": 65.41896447870636,
   "start_xy": [
    259952.395038719,
    285464.92618841724
   ],
   "end_xy": [
    259953.02963492076,
    285466.82284011453
   ]
  },
  "max_3m": {
   "gradient_pct": 19.667510901874152,
   "start_distance_m": 1600.0,
   "end_distance_m": 1603.0,
   "midpoint_distance_m": 1601.5,
   "start_elevation_m": 65.1656276223876,
   "end_elevation_m": 65.75565294944383,
   "start_xy": [
    259952.71233681988,
    285465.87451426586
   ],
   "end_xy": [
    259953.66423112253,
    285468.71949181176
   ]
  }
 },
 "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": 0.022,
   "obstruction_max_height_m": 14.0,
   "flagged_windows_m": [
    50
   ]
  },
  "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/wales/dtm_1m/wg_del_23_259283_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_23_259284_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_23_260283_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_23_260284_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_23_260285_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_23_260286_20220117dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_259285_20220319dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_259286_20220319dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_259287_20220319dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_259288_20220319dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_260287_20220319dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_29_260288_20220319dtm.tif"
  ],
  "calculated_at": "2026-08-13T02:09:07+00:00",
  "road_source": "extended-proposals-wales-routes/lane-near-rhyd-meirionnydd.geojson",
  "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_23_259283_20220117dtm.tif",
   "wg_del_23_259284_20220117dtm.tif",
   "wg_del_23_260283_20220117dtm.tif",
   "wg_del_23_260284_20220117dtm.tif",
   "wg_del_23_260285_20220117dtm.tif",
   "wg_del_23_260286_20220117dtm.tif",
   "wg_del_29_259285_20220319dtm.tif",
   "wg_del_29_259286_20220319dtm.tif",
   "wg_del_29_259287_20220319dtm.tif",
   "wg_del_29_259288_20220319dtm.tif",
   "wg_del_29_260287_20220319dtm.tif",
   "wg_del_29_260288_20220319dtm.tif"
  ],
  "elevation_capture_dates": [
   "17-01-2022",
   "19-03-2022"
  ],
  "route_summit_trim_m": 531.2,
  "route_summit_trim_loss_m": 61.4,
  "climb_origin": "osm_incline",
  "notes": "Promoted automatically from triage verdict=validated. Named from nearest OSM place node (Rhyd-Meirionnydd); originally unnamed at (52.4559, -4.0576). EXTENDED by graph walk: +2 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "confidence": "B"
}