{
 "ocl_version": "0.1.0",
 "name": "Height of Land Road",
 "slug": "height-of-land-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.65083857080958,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1907.0,
   "end_distance_m": 1909.0,
   "start_elevation_m": 395.9897435372,
   "end_elevation_m": 396.9227603086162,
   "min_gradient_pct": -48.84700316423789
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.61693096739024,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1907.0,
   "end_distance_m": 1910.0,
   "start_elevation_m": 395.9897435372,
   "end_elevation_m": 397.0882514662217,
   "min_gradient_pct": -39.38847449868869
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 32.688937185397435,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1138.0,
   "end_distance_m": 1143.0,
   "start_elevation_m": 334.32994092772856,
   "end_elevation_m": 335.96438778699843,
   "min_gradient_pct": -30.618000238413288
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.206886796632034,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1133.0,
   "end_distance_m": 1143.0,
   "start_elevation_m": 333.3436991073352,
   "end_elevation_m": 335.96438778699843,
   "min_gradient_pct": -15.479761471708002
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.72554159565965,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1147.0,
   "end_distance_m": 1167.0,
   "start_elevation_m": 335.91148898020737,
   "end_elevation_m": 340.6565972993393,
   "min_gradient_pct": -11.213663204002842
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.594999762693988,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1136.0,
   "end_distance_m": 1161.0,
   "start_elevation_m": 333.86099796382325,
   "end_elevation_m": 339.25974790449675,
   "min_gradient_pct": -11.02753151325237
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.97100821405172,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1116.0,
   "end_distance_m": 1166.0,
   "start_elevation_m": 330.4974143595519,
   "end_elevation_m": 340.48291846657776,
   "min_gradient_pct": -10.67225111364155
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.90788153017121,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 712.0,
   "end_distance_m": 812.0,
   "start_elevation_m": 298.22443151714305,
   "end_elevation_m": 312.13231304731426,
   "min_gradient_pct": -10.149126060103697
  }
 ],
 "shape": {
  "ascent_concentration": 0.437,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 101.0,
  "shape_class": "sustained"
 },
 "length_m": 3334.526209182158,
 "start_elevation_m": 286.7110095908233,
 "end_elevation_m": 398.437352072753,
 "endpoint_gain_m": 111.72634248192969,
 "overall_gradient_pct": 3.350591222653255,
 "accumulated_ascent_m": 186.73879448222846,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 32.688937185397435,
   "start_distance_m": 1138.0,
   "end_distance_m": 1143.0,
   "midpoint_distance_m": 1140.5,
   "start_elevation_m": 334.32994092772856,
   "end_elevation_m": 335.96438778699843,
   "start_xy": [
    259341.22219398397,
    4833293.632751423
   ],
   "end_xy": [
    259337.03119498573,
    4833296.359567772
   ]
  },
  "max_10m": {
   "gradient_pct": 26.206886796632034,
   "start_distance_m": 1133.0,
   "end_distance_m": 1143.0,
   "midpoint_distance_m": 1138.0,
   "start_elevation_m": 333.3436991073352,
   "end_elevation_m": 335.96438778699843,
   "start_xy": [
    259345.41319298217,
    4833290.905935075
   ],
   "end_xy": [
    259337.03119498573,
    4833296.359567772
   ]
  },
  "max_20m": {
   "gradient_pct": 23.72554159565965,
   "start_distance_m": 1147.0,
   "end_distance_m": 1167.0,
   "midpoint_distance_m": 1157.0,
   "start_elevation_m": 335.91148898020737,
   "end_elevation_m": 340.6565972993393,
   "start_xy": [
    259333.67839578717,
    4833298.54102085
   ],
   "end_xy": [
    259316.91439979427,
    4833309.448286243
   ]
  },
  "max_25m": {
   "gradient_pct": 21.594999762693988,
   "start_distance_m": 1136.0,
   "end_distance_m": 1161.0,
   "midpoint_distance_m": 1148.5,
   "start_elevation_m": 333.86099796382325,
   "end_elevation_m": 339.25974790449675,
   "start_xy": [
    259342.89859358323,
    4833292.542024883
   ],
   "end_xy": [
    259321.94359859213,
    4833306.176106625
   ]
  },
  "max_50m": {
   "gradient_pct": 19.97100821405172,
   "start_distance_m": 1116.0,
   "end_distance_m": 1166.0,
   "midpoint_distance_m": 1141.0,
   "start_elevation_m": 330.4974143595519,
   "end_elevation_m": 340.48291846657776,
   "start_xy": [
    259360.7404079997,
    4833283.59019811
   ],
   "end_xy": [
    259317.75259959392,
    4833308.902922973
   ]
  },
  "max_100m": {
   "gradient_pct": 13.90788153017121,
   "start_distance_m": 712.0,
   "end_distance_m": 812.0,
   "midpoint_distance_m": 762.0,
   "start_elevation_m": 298.22443151714305,
   "end_elevation_m": 312.13231304731426,
   "start_xy": [
    259723.27008546123,
    4833245.487682246
   ],
   "end_xy": [
    259634.80057913627,
    4833199.104295305
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -30.618000238413288,
   "start_distance_m": 1278.0,
   "end_distance_m": 1283.0,
   "midpoint_distance_m": 1280.5,
   "start_elevation_m": 339.26927279583686,
   "end_elevation_m": 337.7383727839162,
   "start_xy": [
    259213.60340029193,
    4833341.962923712
   ],
   "end_xy": [
    259208.60662759806,
    4833342.142541768
   ]
  },
  "min_10m": {
   "gradient_pct": -15.479761471708002,
   "start_distance_m": 1273.0,
   "end_distance_m": 1283.0,
   "midpoint_distance_m": 1278.0,
   "start_elevation_m": 339.286348931087,
   "end_elevation_m": 337.7383727839162,
   "start_xy": [
    259218.60017298578,
    4833341.783305657
   ],
   "end_xy": [
    259208.60662759806,
    4833342.142541768
   ]
  },
  "min_20m": {
   "gradient_pct": -11.213663204002842,
   "start_distance_m": 2936.0,
   "end_distance_m": 2956.0,
   "midpoint_distance_m": 2946.0,
   "start_elevation_m": 425.9581934447391,
   "end_elevation_m": 423.7154608039385,
   "start_xy": [
    257826.69175451438,
    4833360.510496473
   ],
   "end_xy": [
    257813.0860551484,
    4833375.169450896
   ]
  },
  "min_25m": {
   "gradient_pct": -11.02753151325237,
   "start_distance_m": 2936.0,
   "end_distance_m": 2961.0,
   "midpoint_distance_m": 2948.5,
   "start_elevation_m": 425.9581934447391,
   "end_elevation_m": 423.201310566426,
   "start_xy": [
    257826.69175451438,
    4833360.510496473
   ],
   "end_xy": [
    257809.6846303069,
    4833378.834189502
   ]
  },
  "min_50m": {
   "gradient_pct": -10.67225111364155,
   "start_distance_m": 2936.0,
   "end_distance_m": 2986.0,
   "midpoint_distance_m": 2961.0,
   "start_elevation_m": 425.9581934447391,
   "end_elevation_m": 420.6220678879183,
   "start_xy": [
    257826.69175451438,
    4833360.510496473
   ],
   "end_xy": [
    257792.67750609943,
    4833397.157882529
   ]
  },
  "min_100m": {
   "gradient_pct": -10.149126060103697,
   "start_distance_m": 2782.0,
   "end_distance_m": 2882.0,
   "midpoint_distance_m": 2832.0,
   "start_elevation_m": 440.96185100048166,
   "end_elevation_m": 430.81272494037796,
   "start_xy": [
    257941.83532347163,
    4833263.391586796
   ],
   "end_xy": [
    257864.3203502974,
    4833321.781254074
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.65083857080958,
   "start_distance_m": 1907.0,
   "end_distance_m": 1909.0,
   "midpoint_distance_m": 1908.0,
   "start_elevation_m": 395.9897435372,
   "end_elevation_m": 396.9227603086162,
   "start_xy": [
    258659.1555197725,
    4833554.388701345
   ],
   "end_xy": [
    258657.4121091315,
    4833553.408640461
   ]
  },
  "max_3m": {
   "gradient_pct": 36.61693096739024,
   "start_distance_m": 1907.0,
   "end_distance_m": 1910.0,
   "midpoint_distance_m": 1908.5,
   "start_elevation_m": 395.9897435372,
   "end_elevation_m": 397.0882514662217,
   "start_xy": [
    258659.1555197725,
    4833554.388701345
   ],
   "end_xy": [
    258656.540403811,
    4833552.918610019
   ]
  }
 },
 "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": [
   "descends_at_start"
  ],
  "suggested_summit_cut_m": 2634.0,
  "trailing_descent_m": 49.3
 },
 "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/nh/USGS_one_meter_x25y484_NH_CT_RiverNorthL6_2015.tif",
   "data/cache/usa/nh/USGS_one_meter_x26y484_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:48:28+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-nh-2-260824",
  "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, NH_CT_RiverNorthL6_2015 (collected 2015)",
  "elevation_tile_ids": [
   "x25y484",
   "x26y484"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.8% over 200 m (Terrain 50), gain 111.7 m over 3335 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). 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": "Grafton",
  "county": "New Hampshire"
 }
}