{
 "ocl_version": "0.1.0",
 "name": "Poole Hill Road",
 "slug": "poole-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 30.93053477024057,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 616.0,
   "end_distance_m": 618.0,
   "start_elevation_m": 304.89224111228,
   "end_elevation_m": 305.5108518076848,
   "min_gradient_pct": -5.099288141784086
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.794547906362748,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 616.0,
   "end_distance_m": 619.0,
   "start_elevation_m": 304.89224111228,
   "end_elevation_m": 305.72607754947086,
   "min_gradient_pct": -4.043526778271674
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.211260941507135,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 653.0,
   "end_distance_m": 658.0,
   "start_elevation_m": 312.28327388832986,
   "end_elevation_m": 313.4438369354052,
   "min_gradient_pct": -3.3986920632810325
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.417462625049325,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 652.0,
   "end_distance_m": 662.0,
   "start_elevation_m": 312.07744928179017,
   "end_elevation_m": 314.3191955442951,
   "min_gradient_pct": -3.044371322127404
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.457011683273777,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 639.0,
   "end_distance_m": 659.0,
   "start_elevation_m": 309.36487939089943,
   "end_elevation_m": 313.6562817275542,
   "min_gradient_pct": -2.5823039465993247
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.365976252256587,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 633.0,
   "end_distance_m": 658.0,
   "start_elevation_m": 308.10234287234107,
   "end_elevation_m": 313.4438369354052,
   "min_gradient_pct": -2.3249217252086964
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.661878619714912,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 569.0,
   "end_distance_m": 619.0,
   "start_elevation_m": 295.3951382396134,
   "end_elevation_m": 305.72607754947086,
   "min_gradient_pct": -1.378598283534302
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.22071555554959,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 568.0,
   "end_distance_m": 668.0,
   "start_elevation_m": 295.2161042843579,
   "end_elevation_m": 315.4368198399075,
   "min_gradient_pct": -0.6694090262753889
  }
 ],
 "shape": {
  "ascent_concentration": 0.452,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 624.0,
  "shape_class": "stepped"
 },
 "length_m": 2442.000000000243,
 "start_elevation_m": 269.50157385656007,
 "end_elevation_m": 484.56300374499676,
 "endpoint_gain_m": 215.0614298884367,
 "overall_gradient_pct": 8.806774360704967,
 "accumulated_ascent_m": 218.34483467726864,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.211260941507135,
   "start_distance_m": 653.0,
   "end_distance_m": 658.0,
   "midpoint_distance_m": 655.5,
   "start_elevation_m": 312.28327388832986,
   "end_elevation_m": 313.4438369354052,
   "start_xy": [
    280970.6677597624,
    4837511.278139384
   ],
   "end_xy": [
    280975.6280576173,
    4837510.649298183
   ]
  },
  "max_10m": {
   "gradient_pct": 22.417462625049325,
   "start_distance_m": 652.0,
   "end_distance_m": 662.0,
   "midpoint_distance_m": 657.0,
   "start_elevation_m": 312.07744928179017,
   "end_elevation_m": 314.3191955442951,
   "start_xy": [
    280969.67573000106,
    4837511.404143165
   ],
   "end_xy": [
    280979.59641701746,
    4837510.14718292
   ]
  },
  "max_20m": {
   "gradient_pct": 21.457011683273777,
   "start_distance_m": 639.0,
   "end_distance_m": 659.0,
   "midpoint_distance_m": 649.0,
   "start_elevation_m": 309.36487939089943,
   "end_elevation_m": 313.6562817275542,
   "start_xy": [
    280956.7788379552,
    4837513.038199855
   ],
   "end_xy": [
    280976.6202032221,
    4837510.524210074
   ]
  },
  "max_25m": {
   "gradient_pct": 21.365976252256587,
   "start_distance_m": 633.0,
   "end_distance_m": 658.0,
   "midpoint_distance_m": 645.5,
   "start_elevation_m": 308.10234287234107,
   "end_elevation_m": 313.4438369354052,
   "start_xy": [
    280950.8265261101,
    4837513.793169063
   ],
   "end_xy": [
    280975.6280576173,
    4837510.649298183
   ]
  },
  "max_50m": {
   "gradient_pct": 20.661878619714912,
   "start_distance_m": 569.0,
   "end_distance_m": 619.0,
   "midpoint_distance_m": 594.0,
   "start_elevation_m": 295.3951382396134,
   "end_elevation_m": 305.72607754947086,
   "start_xy": [
    280887.38121710287,
    4837513.927991625
   ],
   "end_xy": [
    280936.9034089906,
    4837515.253024221
   ]
  },
  "max_100m": {
   "gradient_pct": 20.22071555554959,
   "start_distance_m": 568.0,
   "end_distance_m": 668.0,
   "midpoint_distance_m": 618.0,
   "start_elevation_m": 295.2161042843579,
   "end_elevation_m": 315.4368198399075,
   "start_xy": [
    280886.5646113598,
    4837513.35960295
   ],
   "end_xy": [
    280985.50790624274,
    4837509.131018681
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.3986920632810325,
   "start_distance_m": 1649.0,
   "end_distance_m": 1654.0,
   "midpoint_distance_m": 1651.5,
   "start_elevation_m": 440.9577500435093,
   "end_elevation_m": 440.78781544034524,
   "start_xy": [
    281713.27681694645,
    4837956.155025
   ],
   "end_xy": [
    281714.7870461794,
    4837960.921491931
   ]
  },
  "min_10m": {
   "gradient_pct": -3.044371322127404,
   "start_distance_m": 1647.0,
   "end_distance_m": 1657.0,
   "midpoint_distance_m": 1652.0,
   "start_elevation_m": 441.0258136055404,
   "end_elevation_m": 440.72137647332767,
   "start_xy": [
    281712.67289335525,
    4837954.248384969
   ],
   "end_xy": [
    281715.69385906955,
    4837963.781157925
   ]
  },
  "min_20m": {
   "gradient_pct": -2.5823039465993247,
   "start_distance_m": 1643.0,
   "end_distance_m": 1663.0,
   "midpoint_distance_m": 1653.0,
   "start_elevation_m": 441.12920971818176,
   "end_elevation_m": 440.6127489288619,
   "start_xy": [
    281711.464860868,
    4837950.435163599
   ],
   "end_xy": [
    281717.505815148,
    4837969.501019325
   ]
  },
  "min_25m": {
   "gradient_pct": -2.3249217252086964,
   "start_distance_m": 1638.0,
   "end_distance_m": 1663.0,
   "midpoint_distance_m": 1650.5,
   "start_elevation_m": 441.19397936016406,
   "end_elevation_m": 440.6127489288619,
   "start_xy": [
    281710.22617524874,
    4837945.5991184795
   ],
   "end_xy": [
    281717.505815148,
    4837969.501019325
   ]
  },
  "min_50m": {
   "gradient_pct": -1.378598283534302,
   "start_distance_m": 1635.0,
   "end_distance_m": 1685.0,
   "midpoint_distance_m": 1660.0,
   "start_elevation_m": 441.225865089903,
   "end_elevation_m": 440.53656594813583,
   "start_xy": [
    281709.68397067237,
    4837942.648523171
   ],
   "end_xy": [
    281725.0894608461,
    4837990.138032597
   ]
  },
  "min_100m": {
   "gradient_pct": -0.6694090262753889,
   "start_distance_m": 1628.0,
   "end_distance_m": 1728.0,
   "midpoint_distance_m": 1678.0,
   "start_elevation_m": 441.18983677525387,
   "end_elevation_m": 440.5204277489785,
   "start_xy": [
    281708.4171726595,
    4837935.764104403
   ],
   "end_xy": [
    281743.2851096044,
    4838029.045737338
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 30.93053477024057,
   "start_distance_m": 616.0,
   "end_distance_m": 618.0,
   "midpoint_distance_m": 617.0,
   "start_elevation_m": 304.89224111228,
   "end_elevation_m": 305.5108518076848,
   "start_xy": [
    280933.91854629235,
    4837515.554010423
   ],
   "end_xy": [
    280935.9084214279,
    4837515.353022972
   ]
  },
  "max_3m": {
   "gradient_pct": 27.794547906362748,
   "start_distance_m": 616.0,
   "end_distance_m": 619.0,
   "midpoint_distance_m": 617.5,
   "start_elevation_m": 304.89224111228,
   "end_elevation_m": 305.72607754947086,
   "start_xy": [
    280933.91854629235,
    4837515.554010423
   ],
   "end_xy": [
    280936.9034089906,
    4837515.253024221
   ]
  }
 },
 "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": 0.265,
   "obstruction_max_height_m": 31.59,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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_x28y484_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-09-03T22:51:49+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": "extent-trim-v2-260903",
  "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": [
   "x28y484"
  ],
  "route_cut_m": 2442.0,
  "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": 0.994,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Bridgewater",
  "county": "New Hampshire"
 }
}