{
 "ocl_version": "0.1.0",
 "name": "Huckins Hill Road",
 "slug": "huckins-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 39.53808128090088,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 335.0,
   "end_distance_m": 337.0,
   "start_elevation_m": 199.07408893231172,
   "end_elevation_m": 199.86485055792974,
   "min_gradient_pct": -25.835995282943713
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.690254737460236,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 335.0,
   "end_distance_m": 338.0,
   "start_elevation_m": 199.07408893231172,
   "end_elevation_m": 200.14479657443553,
   "min_gradient_pct": -22.775767731686376
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.448387129875755,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 332.0,
   "end_distance_m": 337.0,
   "start_elevation_m": 198.14243120143595,
   "end_elevation_m": 199.86485055792974,
   "min_gradient_pct": -15.704712230280506
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.19101443153704,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 332.0,
   "end_distance_m": 342.0,
   "start_elevation_m": 198.14243120143595,
   "end_elevation_m": 201.36153264458966,
   "min_gradient_pct": -7.926373799789985
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.962921066625114,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 324.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 196.53622732466803,
   "end_elevation_m": 201.92881153799306,
   "min_gradient_pct": -4.809772496186895
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.836570723306636,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 319.0,
   "end_distance_m": 344.0,
   "start_elevation_m": 195.4696688571664,
   "end_elevation_m": 201.92881153799306,
   "min_gradient_pct": -4.84724404079725
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.55881946033128,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 299.0,
   "end_distance_m": 349.0,
   "start_elevation_m": 191.51705126932458,
   "end_elevation_m": 202.79646099949022,
   "min_gradient_pct": -4.329461984306306
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.539828699185563,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 275.0,
   "end_distance_m": 375.0,
   "start_elevation_m": 187.00828521929807,
   "end_elevation_m": 206.54811391848364,
   "min_gradient_pct": -0.31613514455463587
  }
 ],
 "shape": {
  "ascent_concentration": 0.424,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 177.0,
  "shape_class": "sustained"
 },
 "length_m": 574.6577523593853,
 "start_elevation_m": 171.66438774151834,
 "end_elevation_m": 230.5531093785112,
 "endpoint_gain_m": 58.88872163699287,
 "overall_gradient_pct": 10.247616323840079,
 "accumulated_ascent_m": 62.17024582388501,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.448387129875755,
   "start_distance_m": 332.0,
   "end_distance_m": 337.0,
   "midpoint_distance_m": 334.5,
   "start_elevation_m": 198.14243120143595,
   "end_elevation_m": 199.86485055792974,
   "start_xy": [
    285631.20173511223,
    4850584.077700438
   ],
   "end_xy": [
    285634.3238762745,
    4850580.175435647
   ]
  },
  "max_10m": {
   "gradient_pct": 32.19101443153704,
   "start_distance_m": 332.0,
   "end_distance_m": 342.0,
   "midpoint_distance_m": 337.0,
   "start_elevation_m": 198.14243120143595,
   "end_elevation_m": 201.36153264458966,
   "start_xy": [
    285631.20173511223,
    4850584.077700438
   ],
   "end_xy": [
    285637.5062574217,
    4850576.318954061
   ]
  },
  "max_20m": {
   "gradient_pct": 26.962921066625114,
   "start_distance_m": 324.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 334.0,
   "start_elevation_m": 196.53622732466803,
   "end_elevation_m": 201.92881153799306,
   "start_xy": [
    285626.6198638681,
    4850590.635631202
   ],
   "end_xy": [
    285638.77920988057,
    4850574.776361425
   ]
  },
  "max_25m": {
   "gradient_pct": 25.836570723306636,
   "start_distance_m": 319.0,
   "end_distance_m": 344.0,
   "midpoint_distance_m": 331.5,
   "start_elevation_m": 195.4696688571664,
   "end_elevation_m": 201.92881153799306,
   "start_xy": [
    285623.7561943405,
    4850594.73433793
   ],
   "end_xy": [
    285638.77920988057,
    4850574.776361425
   ]
  },
  "max_50m": {
   "gradient_pct": 22.55881946033128,
   "start_distance_m": 299.0,
   "end_distance_m": 349.0,
   "midpoint_distance_m": 324.0,
   "start_elevation_m": 191.51705126932458,
   "end_elevation_m": 202.79646099949022,
   "start_xy": [
    285612.7460734452,
    4850611.412056888
   ],
   "end_xy": [
    285642.24351437745,
    4850571.178789337
   ]
  },
  "max_100m": {
   "gradient_pct": 19.539828699185563,
   "start_distance_m": 275.0,
   "end_distance_m": 375.0,
   "midpoint_distance_m": 325.0,
   "start_elevation_m": 187.00828521929807,
   "end_elevation_m": 206.54811391848364,
   "start_xy": [
    285600.73648986814,
    4850632.191097348
   ],
   "end_xy": [
    285660.76734100375,
    4850552.934253818
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.704712230280506,
   "start_distance_m": 49.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 51.5,
   "start_elevation_m": 170.16377240780503,
   "end_elevation_m": 169.378536796291,
   "start_xy": [
    285453.5104532646,
    4850799.619711965
   ],
   "end_xy": [
    285456.702630971,
    4850795.771335491
   ]
  },
  "min_10m": {
   "gradient_pct": -7.926373799789985,
   "start_distance_m": 44.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 49.0,
   "start_elevation_m": 170.17117417627,
   "end_elevation_m": 169.378536796291,
   "start_xy": [
    285450.3182755581,
    4850803.468088441
   ],
   "end_xy": [
    285456.702630971,
    4850795.771335491
   ]
  },
  "min_20m": {
   "gradient_pct": -4.809772496186895,
   "start_distance_m": 34.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 44.0,
   "start_elevation_m": 170.34049129552838,
   "end_elevation_m": 169.378536796291,
   "start_xy": [
    285443.9339201452,
    4850811.164841389
   ],
   "end_xy": [
    285456.702630971,
    4850795.771335491
   ]
  },
  "min_25m": {
   "gradient_pct": -4.84724404079725,
   "start_distance_m": 29.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 41.5,
   "start_elevation_m": 170.5903478064903,
   "end_elevation_m": 169.378536796291,
   "start_xy": [
    285440.75140801136,
    4850815.020917478
   ],
   "end_xy": [
    285456.702630971,
    4850795.771335491
   ]
  },
  "min_50m": {
   "gradient_pct": -4.329461984306306,
   "start_distance_m": 4.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 171.54326778844415,
   "end_elevation_m": 169.378536796291,
   "start_xy": [
    285425.5984629405,
    4850834.905097729
   ],
   "end_xy": [
    285456.702630971,
    4850795.771335491
   ]
  },
  "min_100m": {
   "gradient_pct": -0.31613514455463587,
   "start_distance_m": 1.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 51.0,
   "start_elevation_m": 171.68976702858768,
   "end_elevation_m": 171.37363188403305,
   "start_xy": [
    285423.7973657351,
    4850837.304274432
   ],
   "end_xy": [
    285488.60761182493,
    4850761.311863367
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 39.53808128090088,
   "start_distance_m": 335.0,
   "end_distance_m": 337.0,
   "midpoint_distance_m": 336.0,
   "start_elevation_m": 199.07408893231172,
   "end_elevation_m": 199.86485055792974,
   "start_xy": [
    285633.05092381564,
    4850581.718028283
   ],
   "end_xy": [
    285634.3238762745,
    4850580.175435647
   ]
  },
  "max_3m": {
   "gradient_pct": 35.690254737460236,
   "start_distance_m": 335.0,
   "end_distance_m": 338.0,
   "midpoint_distance_m": 336.5,
   "start_elevation_m": 199.07408893231172,
   "end_elevation_m": 200.14479657443553,
   "start_xy": [
    285633.05092381564,
    4850581.718028283
   ],
   "end_xy": [
    285634.960352504,
    4850579.404139331
   ]
  }
 },
 "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": 0.648,
   "obstruction_max_height_m": 27.67,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "descends_at_start",
   "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/nh/USGS_one_meter_x28y486_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-09-05T00:03:30+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": "hunt-wave2-260905",
  "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": [
   "x28y486"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_CT_River_Lot6_Winnipesaulee_2015_LAS_2017",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.986,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Holderness",
  "county": "New Hampshire"
 }
}