{
 "ocl_version": "0.1.0",
 "name": "Nichols Lane",
 "slug": "nichols-lane",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 51.93004058882522,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 21.687850067132228,
   "min_gradient_pct": -4.621280798596672
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 50.402321385207564,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 22.16131889691195,
   "min_gradient_pct": -4.574268852306318
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 41.77320460595972,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 22.73790948565371,
   "min_gradient_pct": -4.156683457271129
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.98902231250686,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 166.0,
   "end_distance_m": 176.0,
   "start_elevation_m": 40.337374528714065,
   "end_elevation_m": 42.63627675996475,
   "min_gradient_pct": -3.214898352379265
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.706440917435557,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 166.0,
   "end_distance_m": 186.0,
   "start_elevation_m": 40.337374528714065,
   "end_elevation_m": 44.87866271220118,
   "min_gradient_pct": -2.4767367669665674
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.608011346950747,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 165.0,
   "end_distance_m": 190.0,
   "start_elevation_m": 40.119717673318846,
   "end_elevation_m": 45.77172051005653,
   "min_gradient_pct": -2.1551066798079432
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.676181433412292,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 145.0,
   "end_distance_m": 195.0,
   "start_elevation_m": 35.98634640774214,
   "end_elevation_m": 46.82443712444829,
   "min_gradient_pct": -1.6520127333496077
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.6520658093691,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 222.0,
   "start_elevation_m": 32.72907425954937,
   "end_elevation_m": 51.38114006891847,
   "min_gradient_pct": -1.0255370960904102
  }
 ],
 "shape": {
  "ascent_concentration": 0.517,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 176.0,
  "shape_class": "stepped"
 },
 "length_m": 411.64059933269954,
 "start_elevation_m": 20.649249255355723,
 "end_elevation_m": 55.654572673267175,
 "endpoint_gain_m": 35.005323417911455,
 "overall_gradient_pct": 8.50385590601552,
 "accumulated_ascent_m": 36.77339625639266,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 41.77320460595972,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 22.73790948565371,
   "start_xy": [
    273288.009,
    4598137.3
   ],
   "end_xy": [
    273283.03458892665,
    4598136.804096455
   ]
  },
  "max_10m": {
   "gradient_pct": 22.98902231250686,
   "start_distance_m": 166.0,
   "end_distance_m": 176.0,
   "midpoint_distance_m": 171.0,
   "start_elevation_m": 40.337374528714065,
   "end_elevation_m": 42.63627675996475,
   "start_xy": [
    273123.82374637533,
    4598156.163381609
   ],
   "end_xy": [
    273113.83468955604,
    4598156.63108222
   ]
  },
  "max_20m": {
   "gradient_pct": 22.706440917435557,
   "start_distance_m": 166.0,
   "end_distance_m": 186.0,
   "midpoint_distance_m": 176.0,
   "start_elevation_m": 40.337374528714065,
   "end_elevation_m": 44.87866271220118,
   "start_xy": [
    273123.82374637533,
    4598156.163381609
   ],
   "end_xy": [
    273103.84563273675,
    4598157.09878283
   ]
  },
  "max_25m": {
   "gradient_pct": 22.608011346950747,
   "start_distance_m": 165.0,
   "end_distance_m": 190.0,
   "midpoint_distance_m": 177.5,
   "start_elevation_m": 40.119717673318846,
   "end_elevation_m": 45.77172051005653,
   "start_xy": [
    273124.8226520572,
    4598156.116611549
   ],
   "end_xy": [
    273099.850010009,
    4598157.2858630745
   ]
  },
  "max_50m": {
   "gradient_pct": 21.676181433412292,
   "start_distance_m": 145.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 170.0,
   "start_elevation_m": 35.98634640774214,
   "end_elevation_m": 46.82443712444829,
   "start_xy": [
    273144.8072157615,
    4598155.508884571
   ],
   "end_xy": [
    273094.85548159934,
    4598157.519713379
   ]
  },
  "max_100m": {
   "gradient_pct": 18.6520658093691,
   "start_distance_m": 122.0,
   "end_distance_m": 222.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 32.72907425954937,
   "end_elevation_m": 51.38114006891847,
   "start_xy": [
    273167.71444149717,
    4598153.745917967
   ],
   "end_xy": [
    273068.0671618359,
    4598160.424943912
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.156683457271129,
   "start_distance_m": 403.0,
   "end_distance_m": 408.0,
   "midpoint_distance_m": 405.5,
   "start_elevation_m": 55.85728042943414,
   "end_elevation_m": 55.649446256570585,
   "start_xy": [
    272914.51192206726,
    4598250.7540025385
   ],
   "end_xy": [
    272910.738502067,
    4598254.034444811
   ]
  },
  "min_10m": {
   "gradient_pct": -3.214898352379265,
   "start_distance_m": 399.0,
   "end_distance_m": 409.0,
   "midpoint_distance_m": 404.0,
   "start_elevation_m": 55.94347325829287,
   "end_elevation_m": 55.62198342305494,
   "start_xy": [
    272917.53065806755,
    4598248.129648721
   ],
   "end_xy": [
    272909.98381806695,
    4598254.6905332655
   ]
  },
  "min_20m": {
   "gradient_pct": -2.4767367669665674,
   "start_distance_m": 390.0,
   "end_distance_m": 410.0,
   "midpoint_distance_m": 400.0,
   "start_elevation_m": 56.10602897493285,
   "end_elevation_m": 55.610681621539534,
   "start_xy": [
    272924.48941577727,
    4598242.431692234
   ],
   "end_xy": [
    272909.2291340669,
    4598255.34662172
   ]
  },
  "min_25m": {
   "gradient_pct": -2.1551066798079432,
   "start_distance_m": 385.0,
   "end_distance_m": 410.0,
   "midpoint_distance_m": 397.5,
   "start_elevation_m": 56.14945829149152,
   "end_elevation_m": 55.610681621539534,
   "start_xy": [
    272928.49839292234,
    4598239.44369922
   ],
   "end_xy": [
    272909.2291340669,
    4598255.34662172
   ]
  },
  "min_50m": {
   "gradient_pct": -1.6520127333496077,
   "start_distance_m": 359.0,
   "end_distance_m": 409.0,
   "midpoint_distance_m": 384.0,
   "start_elevation_m": 56.447989789729746,
   "end_elevation_m": 55.62198342305494,
   "start_xy": [
    272949.3450740765,
    4598223.906135549
   ],
   "end_xy": [
    272909.98381806695,
    4598254.6905332655
   ]
  },
  "min_100m": {
   "gradient_pct": -1.0255370960904102,
   "start_distance_m": 310.0,
   "end_distance_m": 410.0,
   "midpoint_distance_m": 360.0,
   "start_elevation_m": 56.636218717629944,
   "end_elevation_m": 55.610681621539534,
   "start_xy": [
    272989.0020910715,
    4598195.128182292
   ],
   "end_xy": [
    272909.2291340669,
    4598255.34662172
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 51.93004058882522,
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "midpoint_distance_m": 1.0,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 21.687850067132228,
   "start_xy": [
    273288.009,
    4598137.3
   ],
   "end_xy": [
    273286.02337579237,
    4598137.063235551
   ]
  },
  "max_3m": {
   "gradient_pct": 50.402321385207564,
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "midpoint_distance_m": 1.5,
   "start_elevation_m": 20.649249255355723,
   "end_elevation_m": 22.16131889691195,
   "start_xy": [
    273288.009,
    4598137.3
   ],
   "end_xy": [
    273285.0271135038,
    4598136.976855853
   ]
  }
 },
 "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": [
   "short_window_divergence"
  ],
  "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ri/USGS_1M_19_x27y460_RI_Statewide_D22.tif"
  ],
  "calculated_at": "2026-08-24T22:23:29+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/rhode-island-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ri-1-260824",
  "elevation_provider": "USGS 3DEP (The National Map)",
  "elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
  "elevation_dataset": "USGS 3DEP 1 m DEM, RI_Statewide_D22 (collected 2022)",
  "elevation_tile_ids": [
   "x27y460"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.0% over 200 m (Terrain 50), gain 31.7 m over 359 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. ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Richmond",
  "county": "Rhode Island"
 }
}