{
 "ocl_version": "0.1.0",
 "name": "Lister's Drive",
 "slug": "lister-s-drive",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.273493310332242,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 683.0,
   "end_distance_m": 685.0,
   "start_elevation_m": 171.83256047388846,
   "end_elevation_m": 172.3780303400951,
   "min_gradient_pct": -3.4837713201106624
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.826896054169918,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 682.0,
   "end_distance_m": 685.0,
   "start_elevation_m": 171.57322345847,
   "end_elevation_m": 172.3780303400951,
   "min_gradient_pct": -1.890836216756971
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.009704425134714,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 683.0,
   "end_distance_m": 688.0,
   "start_elevation_m": 171.83256047388846,
   "end_elevation_m": 173.1330456951452,
   "min_gradient_pct": 0.6572923694591282
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.248999081026398,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 675.0,
   "end_distance_m": 685.0,
   "start_elevation_m": 169.85313043199247,
   "end_elevation_m": 172.3780303400951,
   "min_gradient_pct": 3.889783204030408
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.97759967188088,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 668.0,
   "end_distance_m": 688.0,
   "start_elevation_m": 168.13752576076902,
   "end_elevation_m": 173.1330456951452,
   "min_gradient_pct": 4.9059764606032985
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.20910911296562,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 669.0,
   "end_distance_m": 694.0,
   "start_elevation_m": 168.36604326041112,
   "end_elevation_m": 174.41832053865252,
   "min_gradient_pct": 5.461681363796515
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.88495261811209,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 668.0,
   "end_distance_m": 718.0,
   "start_elevation_m": 168.13752576076902,
   "end_elevation_m": 179.58000206982507,
   "min_gradient_pct": 7.170688119914814
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.551124185233956,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 639.0,
   "end_distance_m": 739.0,
   "start_elevation_m": 163.25009703003786,
   "end_elevation_m": 183.80122121527182,
   "min_gradient_pct": 8.450876871177229
  }
 ],
 "shape": {
  "ascent_concentration": 0.372,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 234.0,
  "shape_class": "sustained"
 },
 "length_m": 740.1863478133961,
 "start_elevation_m": 98.75496859977729,
 "end_elevation_m": 184.02395573730047,
 "endpoint_gain_m": 85.26898713752318,
 "overall_gradient_pct": 11.519935133823871,
 "accumulated_ascent_m": 85.65239754708378,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.009704425134714,
   "start_distance_m": 683.0,
   "end_distance_m": 688.0,
   "midpoint_distance_m": 685.5,
   "start_elevation_m": 171.83256047388846,
   "end_elevation_m": 173.1330456951452,
   "start_xy": [
    374236.94780948554,
    198814.43874354454
   ],
   "end_xy": [
    374237.2680047259,
    198809.44906173775
   ]
  },
  "max_10m": {
   "gradient_pct": 25.248999081026398,
   "start_distance_m": 675.0,
   "end_distance_m": 685.0,
   "midpoint_distance_m": 680.0,
   "start_elevation_m": 169.85313043199247,
   "end_elevation_m": 172.3780303400951,
   "start_xy": [
    374236.37499164685,
    198822.41820967477
   ],
   "end_xy": [
    374237.0845831313,
    198812.44344924085
   ]
  },
  "max_20m": {
   "gradient_pct": 24.97759967188088,
   "start_distance_m": 668.0,
   "end_distance_m": 688.0,
   "midpoint_distance_m": 678.0,
   "start_elevation_m": 168.13752576076902,
   "end_elevation_m": 173.1330456951452,
   "start_xy": [
    374235.873776038,
    198829.40024253874
   ],
   "end_xy": [
    374237.2680047259,
    198809.44906173775
   ]
  },
  "max_25m": {
   "gradient_pct": 24.20910911296562,
   "start_distance_m": 669.0,
   "end_distance_m": 694.0,
   "midpoint_distance_m": 681.5,
   "start_elevation_m": 168.36604326041112,
   "end_elevation_m": 174.41832053865252,
   "start_xy": [
    374235.94537826785,
    198828.40280927246
   ],
   "end_xy": [
    374237.63484791515,
    198803.4602867316
   ]
  },
  "max_50m": {
   "gradient_pct": 22.88495261811209,
   "start_distance_m": 668.0,
   "end_distance_m": 718.0,
   "midpoint_distance_m": 693.0,
   "start_elevation_m": 168.13752576076902,
   "end_elevation_m": 179.58000206982507,
   "start_xy": [
    374235.873776038,
    198829.40024253874
   ],
   "end_xy": [
    374223.36977972084,
    198785.16865821945
   ]
  },
  "max_100m": {
   "gradient_pct": 20.551124185233956,
   "start_distance_m": 639.0,
   "end_distance_m": 739.0,
   "midpoint_distance_m": 689.0,
   "start_elevation_m": 163.25009703003786,
   "end_elevation_m": 183.80122121527182,
   "start_xy": [
    374239.86229735037,
    198857.98397425498
   ],
   "end_xy": [
    374206.143178148,
    198773.1584876024
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 0.6572923694591282,
   "start_distance_m": 253.0,
   "end_distance_m": 258.0,
   "midpoint_distance_m": 255.5,
   "start_elevation_m": 123.57221861792803,
   "end_elevation_m": 123.60508323640099,
   "start_xy": [
    374275.70485006674,
    199238.83207110307
   ],
   "end_xy": [
    374274.35438541236,
    199234.020118411
   ]
  },
  "min_10m": {
   "gradient_pct": 3.889783204030408,
   "start_distance_m": 246.0,
   "end_distance_m": 256.0,
   "midpoint_distance_m": 251.0,
   "start_elevation_m": 123.12651521102228,
   "end_elevation_m": 123.51549353142532,
   "start_xy": [
    374277.69114018325,
    199245.54434728727
   ],
   "end_xy": [
    374274.85358287394,
    199235.95538130982
   ]
  },
  "min_20m": {
   "gradient_pct": 4.9059764606032985,
   "start_distance_m": 245.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 123.09038586997744,
   "end_elevation_m": 124.0715811620981,
   "start_xy": [
    374277.97489591414,
    199246.503243885
   ],
   "end_xy": [
    374272.87454152683,
    199227.17833048134
   ]
  },
  "min_25m": {
   "gradient_pct": 5.461681363796515,
   "start_distance_m": 242.0,
   "end_distance_m": 267.0,
   "midpoint_distance_m": 254.5,
   "start_elevation_m": 122.79005327777816,
   "end_elevation_m": 124.15547361872729,
   "start_xy": [
    374278.82616310695,
    199249.37993367825
   ],
   "end_xy": [
    374272.4517289881,
    199225.22353393
   ]
  },
  "min_50m": {
   "gradient_pct": 7.170688119914814,
   "start_distance_m": 240.0,
   "end_distance_m": 290.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 122.59616855495187,
   "end_elevation_m": 126.18151261490928,
   "start_xy": [
    374279.49840789946,
    199251.25230989684
   ],
   "end_xy": [
    374267.39833022514,
    199202.78630403968
   ]
  },
  "min_100m": {
   "gradient_pct": 8.450876871177229,
   "start_distance_m": 245.0,
   "end_distance_m": 345.0,
   "midpoint_distance_m": 295.0,
   "start_elevation_m": 123.09038586997744,
   "end_elevation_m": 131.54126274115467,
   "start_xy": [
    374277.97489591414,
    199246.503243885
   ],
   "end_xy": [
    374261.9349685774,
    199148.2369378727
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.273493310332242,
   "start_distance_m": 683.0,
   "end_distance_m": 685.0,
   "midpoint_distance_m": 684.0,
   "start_elevation_m": 171.83256047388846,
   "end_elevation_m": 172.3780303400951,
   "start_xy": [
    374236.94780948554,
    198814.43874354454
   ],
   "end_xy": [
    374237.0845831313,
    198812.44344924085
   ]
  },
  "max_3m": {
   "gradient_pct": 26.826896054169918,
   "start_distance_m": 682.0,
   "end_distance_m": 685.0,
   "midpoint_distance_m": 683.5,
   "start_elevation_m": 171.57322345847,
   "end_elevation_m": 172.3780303400951,
   "start_xy": [
    374236.8762072557,
    198815.43617681082
   ],
   "end_xy": [
    374237.0845831313,
    198812.44344924085
   ]
  }
 },
 "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": {
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_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/england/bulk_dtm_1m/ST7095.tif"
  ],
  "calculated_at": "2026-09-01T04:16:02+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",
  "run_id": "chunk-04-260901",
  "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": [
   "ST7095.tif"
  ],
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 28] No space left on device",
  "trimmed_from": "lister-s-drive",
  "trim_cut_m": [
   [
    740.2,
    909.9
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Cam",
  "county": "Gloucestershire"
 }
}