{
 "ocl_version": "0.1.0",
 "name": "Hart Hill",
 "slug": "hart-hill",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.37364373180867,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 315.0,
   "end_distance_m": 317.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.06987620816676,
   "min_gradient_pct": -15.896428764953896
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.53708363923901,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 315.0,
   "end_distance_m": 318.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.29851584270776,
   "min_gradient_pct": -9.706520339040026
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.19164409527184,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 315.0,
   "end_distance_m": 320.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.78198553829418,
   "min_gradient_pct": -6.754079266590907
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.640920386207426,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 331.0,
   "end_distance_m": 341.0,
   "start_elevation_m": 171.59677549894448,
   "end_elevation_m": 174.16086753756522,
   "min_gradient_pct": -3.086420960181613
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.200843311276657,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 315.0,
   "end_distance_m": 335.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 172.76257199578592,
   "min_gradient_pct": -2.557014688413517
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.37756555942383,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 315.0,
   "end_distance_m": 340.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 173.91679472338654,
   "min_gradient_pct": -2.1715230964830425
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.937236011652828,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 292.0,
   "end_distance_m": 342.0,
   "start_elevation_m": 166.35376591296065,
   "end_elevation_m": 174.32238391878707,
   "min_gradient_pct": -1.959854096823733
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.039250201821176,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 241.0,
   "end_distance_m": 341.0,
   "start_elevation_m": 159.12161733574405,
   "end_elevation_m": 174.16086753756522,
   "min_gradient_pct": -1.2890284951090507
  }
 ],
 "shape": {
  "ascent_concentration": 0.525,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 123.0,
  "shape_class": "stepped"
 },
 "length_m": 1024.1581453739834,
 "start_elevation_m": 136.4811298339884,
 "end_elevation_m": 192.15664324621616,
 "endpoint_gain_m": 55.67551341222776,
 "overall_gradient_pct": 5.436222292788306,
 "accumulated_ascent_m": 59.81072592156778,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.19164409527184,
   "start_distance_m": 315.0,
   "end_distance_m": 320.0,
   "midpoint_distance_m": 317.5,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.78198553829418,
   "start_xy": [
    594197.3360954028,
    150701.6841328959
   ],
   "end_xy": [
    594202.2693774467,
    150700.90241440755
   ]
  },
  "max_10m": {
   "gradient_pct": 25.640920386207426,
   "start_distance_m": 331.0,
   "end_distance_m": 341.0,
   "midpoint_distance_m": 336.0,
   "start_elevation_m": 171.59677549894448,
   "end_elevation_m": 174.16086753756522,
   "start_xy": [
    594213.2425330023,
    150700.13440349684
   ],
   "end_xy": [
    594223.218143857,
    150699.43642620865
   ]
  },
  "max_20m": {
   "gradient_pct": 22.200843311276657,
   "start_distance_m": 315.0,
   "end_distance_m": 335.0,
   "midpoint_distance_m": 325.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 172.76257199578592,
   "start_xy": [
    594197.3360954028,
    150701.6841328959
   ],
   "end_xy": [
    594217.2327893454,
    150699.85538551683
   ]
  },
  "max_25m": {
   "gradient_pct": 22.37756555942383,
   "start_distance_m": 315.0,
   "end_distance_m": 340.0,
   "midpoint_distance_m": 327.5,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 173.91679472338654,
   "start_xy": [
    594197.3360954028,
    150701.6841328959
   ],
   "end_xy": [
    594222.2205949674,
    150699.5063991506
   ]
  },
  "max_50m": {
   "gradient_pct": 15.937236011652828,
   "start_distance_m": 292.0,
   "end_distance_m": 342.0,
   "midpoint_distance_m": 317.0,
   "start_elevation_m": 166.35376591296065,
   "end_elevation_m": 174.32238391878707,
   "start_xy": [
    594174.7204063268,
    150705.87108744768
   ],
   "end_xy": [
    594224.2156884886,
    150699.366392591
   ]
  },
  "max_100m": {
   "gradient_pct": 15.039250201821176,
   "start_distance_m": 241.0,
   "end_distance_m": 341.0,
   "midpoint_distance_m": 291.0,
   "start_elevation_m": 159.12161733574405,
   "end_elevation_m": 174.16086753756522,
   "start_xy": [
    594125.6610540333,
    150719.168939973
   ],
   "end_xy": [
    594223.218143857,
    150699.43642620865
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.754079266590907,
   "start_distance_m": 1001.0,
   "end_distance_m": 1006.0,
   "midpoint_distance_m": 1003.5,
   "start_elevation_m": 192.62825661223934,
   "end_elevation_m": 192.2905526489098,
   "start_xy": [
    594721.3774946427,
    151003.9981440562
   ],
   "end_xy": [
    594724.8194228974,
    151007.62486715204
   ]
  },
  "min_10m": {
   "gradient_pct": -3.086420960181613,
   "start_distance_m": 996.0,
   "end_distance_m": 1006.0,
   "midpoint_distance_m": 1001.0,
   "start_elevation_m": 192.59919474492796,
   "end_elevation_m": 192.2905526489098,
   "start_xy": [
    594717.9356668083,
    151000.37132573078
   ],
   "end_xy": [
    594724.8194228974,
    151007.62486715204
   ]
  },
  "min_20m": {
   "gradient_pct": -2.557014688413517,
   "start_distance_m": 986.0,
   "end_distance_m": 1006.0,
   "midpoint_distance_m": 996.0,
   "start_elevation_m": 192.8019555865925,
   "end_elevation_m": 192.2905526489098,
   "start_xy": [
    594711.051611894,
    150993.11806631283
   ],
   "end_xy": [
    594724.8194228974,
    151007.62486715204
   ]
  },
  "min_25m": {
   "gradient_pct": -2.1715230964830425,
   "start_distance_m": 981.0,
   "end_distance_m": 1006.0,
   "midpoint_distance_m": 993.5,
   "start_elevation_m": 192.83343342303056,
   "end_elevation_m": 192.2905526489098,
   "start_xy": [
    594707.6096835023,
    150989.49134334698
   ],
   "end_xy": [
    594724.8194228974,
    151007.62486715204
   ]
  },
  "min_50m": {
   "gradient_pct": -1.959854096823733,
   "start_distance_m": 956.0,
   "end_distance_m": 1006.0,
   "midpoint_distance_m": 981.0,
   "start_elevation_m": 193.27047969732166,
   "end_elevation_m": 192.2905526489098,
   "start_xy": [
    594689.5520387344,
    150972.21218251283
   ],
   "end_xy": [
    594724.8194228974,
    151007.62486715204
   ]
  },
  "min_100m": {
   "gradient_pct": -1.2890284951090507,
   "start_distance_m": 924.0,
   "end_distance_m": 1024.0,
   "midpoint_distance_m": 974.0,
   "start_elevation_m": 193.45136604630426,
   "end_elevation_m": 192.1623375511952,
   "start_xy": [
    594665.1264665448,
    150951.82919428626
   ],
   "end_xy": [
    594737.2100659152,
    151020.68135566084
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.37364373180867,
   "start_distance_m": 315.0,
   "end_distance_m": 317.0,
   "midpoint_distance_m": 316.0,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.06987620816676,
   "start_xy": [
    594197.3360954028,
    150701.6841328959
   ],
   "end_xy": [
    594199.3027058052,
    150701.32020502893
   ]
  },
  "max_3m": {
   "gradient_pct": 32.53708363923901,
   "start_distance_m": 315.0,
   "end_distance_m": 318.0,
   "midpoint_distance_m": 316.5,
   "start_elevation_m": 168.3224033335306,
   "end_elevation_m": 169.29851584270776,
   "start_xy": [
    594197.3360954028,
    150701.6841328959
   ],
   "end_xy": [
    594200.2860989359,
    150701.13873057326
   ]
  }
 },
 "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": 0.067,
   "obstruction_max_height_m": 10.98,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/TQ9050.tif"
  ],
  "calculated_at": "2026-08-19T18:35:58+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "TQ9050.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.3% over 200 m (Terrain 50), gain 51.2 m over 971 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. DEDUPE: absorbed 1 overlapping proposal(s): stonestile-farm-road ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Charing",
  "county": "Kent"
 }
}