{
 "ocl_version": "0.1.0",
 "name": "Mountain Road",
 "slug": "mountain-road-3",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 14.345503967579987,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 660.0,
   "end_distance_m": 662.0,
   "start_elevation_m": 147.01698482080798,
   "end_elevation_m": 147.30389490015958,
   "min_gradient_pct": -6.502914410566518
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 13.951001030942697,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 645.0,
   "end_distance_m": 648.0,
   "start_elevation_m": 144.99825906760051,
   "end_elevation_m": 145.4167890985288,
   "min_gradient_pct": -6.404543460661216
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 13.739966848117433,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 649.0,
   "end_distance_m": 654.0,
   "start_elevation_m": 145.54482438374123,
   "end_elevation_m": 146.2318227261471,
   "min_gradient_pct": -6.416369355611096
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 13.660611813400578,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 644.0,
   "end_distance_m": 654.0,
   "start_elevation_m": 144.86576154480704,
   "end_elevation_m": 146.2318227261471,
   "min_gradient_pct": -6.2964747126306975
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 13.52665229417255,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 642.0,
   "end_distance_m": 662.0,
   "start_elevation_m": 144.59856444132507,
   "end_elevation_m": 147.30389490015958,
   "min_gradient_pct": -6.1939009011081225
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 13.49579884417642,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 637.0,
   "end_distance_m": 662.0,
   "start_elevation_m": 143.92994518911547,
   "end_elevation_m": 147.30389490015958,
   "min_gradient_pct": -6.176002789285803
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 13.341618408214288,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 637.0,
   "end_distance_m": 687.0,
   "start_elevation_m": 143.92994518911547,
   "end_elevation_m": 150.60075439322262,
   "min_gradient_pct": -5.937991355648819
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.175477112035336,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 633.0,
   "end_distance_m": 733.0,
   "start_elevation_m": 143.40910908176278,
   "end_elevation_m": 156.58458619379812,
   "min_gradient_pct": -5.117670614406563
  }
 ],
 "shape": {
  "ascent_concentration": 0.48,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 387.0,
  "shape_class": "stepped"
 },
 "length_m": 4279.058300927774,
 "start_elevation_m": 86.73441583800775,
 "end_elevation_m": 298.510725307373,
 "endpoint_gain_m": 211.77630946936523,
 "overall_gradient_pct": 4.949133537709651,
 "accumulated_ascent_m": 227.51198538803618,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 13.739966848117433,
   "start_distance_m": 649.0,
   "end_distance_m": 654.0,
   "midpoint_distance_m": 651.5,
   "start_elevation_m": 145.54482438374123,
   "end_elevation_m": 146.2318227261471,
   "start_xy": [
    679067.4964540857,
    4651542.733942334
   ],
   "end_xy": [
    679062.5019585385,
    4651542.968493458
   ]
  },
  "max_10m": {
   "gradient_pct": 13.660611813400578,
   "start_distance_m": 644.0,
   "end_distance_m": 654.0,
   "midpoint_distance_m": 649.0,
   "start_elevation_m": 144.86576154480704,
   "end_elevation_m": 146.2318227261471,
   "start_xy": [
    679072.4704429756,
    4651542.33348101
   ],
   "end_xy": [
    679062.5019585385,
    4651542.968493458
   ]
  },
  "max_20m": {
   "gradient_pct": 13.52665229417255,
   "start_distance_m": 642.0,
   "end_distance_m": 662.0,
   "midpoint_distance_m": 652.0,
   "start_elevation_m": 144.59856444132507,
   "end_elevation_m": 147.30389490015958,
   "start_xy": [
    679074.4309618125,
    4651541.938049739
   ],
   "end_xy": [
    679054.507419438,
    4651543.195807788
   ]
  },
  "max_25m": {
   "gradient_pct": 13.49579884417642,
   "start_distance_m": 637.0,
   "end_distance_m": 662.0,
   "midpoint_distance_m": 649.5,
   "start_elevation_m": 143.92994518911547,
   "end_elevation_m": 147.30389490015958,
   "start_xy": [
    679079.3322589047,
    4651540.949471561
   ],
   "end_xy": [
    679054.507419438,
    4651543.195807788
   ]
  },
  "max_50m": {
   "gradient_pct": 13.341618408214288,
   "start_distance_m": 637.0,
   "end_distance_m": 687.0,
   "midpoint_distance_m": 662.0,
   "start_elevation_m": 143.92994518911547,
   "end_elevation_m": 150.60075439322262,
   "start_xy": [
    679079.3322589047,
    4651540.949471561
   ],
   "end_xy": [
    679029.534696792,
    4651542.479925638
   ]
  },
  "max_100m": {
   "gradient_pct": 13.175477112035336,
   "start_distance_m": 633.0,
   "end_distance_m": 733.0,
   "midpoint_distance_m": 683.0,
   "start_elevation_m": 143.40910908176278,
   "end_elevation_m": 156.58458619379812,
   "start_xy": [
    679083.2532965784,
    4651540.158609019
   ],
   "end_xy": [
    678984.5035306424,
    4651533.786203279
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.416369355611096,
   "start_distance_m": 3771.0,
   "end_distance_m": 3776.0,
   "midpoint_distance_m": 3773.5,
   "start_elevation_m": 286.21655356467795,
   "end_elevation_m": 285.8957350968974,
   "start_xy": [
    676144.1052252661,
    4651433.157794863
   ],
   "end_xy": [
    676139.1319234289,
    4651432.641782426
   ]
  },
  "min_10m": {
   "gradient_pct": -6.2964747126306975,
   "start_distance_m": 3771.0,
   "end_distance_m": 3781.0,
   "midpoint_distance_m": 3776.0,
   "start_elevation_m": 286.21655356467795,
   "end_elevation_m": 285.5869060934149,
   "start_xy": [
    676144.1052252661,
    4651433.157794863
   ],
   "end_xy": [
    676134.1586215916,
    4651432.125769989
   ]
  },
  "min_20m": {
   "gradient_pct": -6.1939009011081225,
   "start_distance_m": 3762.0,
   "end_distance_m": 3782.0,
   "midpoint_distance_m": 3772.0,
   "start_elevation_m": 286.7684227616479,
   "end_elevation_m": 285.5296425814263,
   "start_xy": [
    676153.0571685731,
    4651434.086617251
   ],
   "end_xy": [
    676133.1639612241,
    4651432.0225675
   ]
  },
  "min_25m": {
   "gradient_pct": -6.176002789285803,
   "start_distance_m": 3756.0,
   "end_distance_m": 3781.0,
   "midpoint_distance_m": 3768.5,
   "start_elevation_m": 287.13090679073633,
   "end_elevation_m": 285.5869060934149,
   "start_xy": [
    676159.0251307779,
    4651434.705832176
   ],
   "end_xy": [
    676134.1586215916,
    4651432.125769989
   ]
  },
  "min_50m": {
   "gradient_pct": -5.937991355648819,
   "start_distance_m": 3750.0,
   "end_distance_m": 3800.0,
   "midpoint_distance_m": 3775.0,
   "start_elevation_m": 287.4560321735257,
   "end_elevation_m": 284.4870364957013,
   "start_xy": [
    676164.9920120412,
    4651435.334670983
   ],
   "end_xy": [
    676115.2082230054,
    4651430.823216891
   ]
  },
  "min_100m": {
   "gradient_pct": -5.117670614406563,
   "start_distance_m": 3723.0,
   "end_distance_m": 3823.0,
   "midpoint_distance_m": 3773.0,
   "start_elevation_m": 288.58482356722203,
   "end_elevation_m": 283.46715295281547,
   "start_xy": [
    676191.77623723,
    4651438.7356592
   ],
   "end_xy": [
    676092.2299136719,
    4651430.580669887
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 14.345503967579987,
   "start_distance_m": 660.0,
   "end_distance_m": 662.0,
   "midpoint_distance_m": 661.0,
   "start_elevation_m": 147.01698482080798,
   "end_elevation_m": 147.30389490015958,
   "start_xy": [
    679056.5074165276,
    4651543.199219693
   ],
   "end_xy": [
    679054.507419438,
    4651543.195807788
   ]
  },
  "max_3m": {
   "gradient_pct": 13.951001030942697,
   "start_distance_m": 645.0,
   "end_distance_m": 648.0,
   "midpoint_distance_m": 646.5,
   "start_elevation_m": 144.99825906760051,
   "end_elevation_m": 145.4167890985288,
   "start_xy": [
    679071.4901835572,
    4651542.531196645
   ],
   "end_xy": [
    679068.4953531951,
    4651542.687032109
   ]
  }
 },
 "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": []
 },
 "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ct/USGS_1M_18_x67y466_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:48:40+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/connecticut-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ct-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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x67y466"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.6% over 200 m (Terrain 50), gain 208.9 m over 4234 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. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-41-9913-72-8412 ADOPTED (NE wave 1, 2026-08-25): big-gain. 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": "Granby",
  "county": "Connecticut"
 }
}