{
 "ocl_version": "0.1.0",
 "name": "Dogwood Drive",
 "slug": "dogwood-drive",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.837630565875088,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 146.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 168.09227911434846,
   "end_elevation_m": 168.52903172566596,
   "min_gradient_pct": -13.229195483820888
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.757463952979112,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 147.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 168.3095076824261,
   "end_elevation_m": 168.96223160101547,
   "min_gradient_pct": -12.974949104103453
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.661780457074542,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 146.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 168.09227911434846,
   "end_elevation_m": 169.17536813720218,
   "min_gradient_pct": -12.574019004961201
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.269446899438265,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 141.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 167.04842344725836,
   "end_elevation_m": 169.17536813720218,
   "min_gradient_pct": -11.015815263860986
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.792736324641794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 137.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 166.22763899882577,
   "end_elevation_m": 170.38618626375413,
   "min_gradient_pct": -9.21511558954407
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.556497139268117,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 134.0,
   "end_distance_m": 159.0,
   "start_elevation_m": 165.64445589088513,
   "end_elevation_m": 170.78358017570216,
   "min_gradient_pct": -8.032974880464849
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.82094643347773,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 131.0,
   "end_distance_m": 181.0,
   "start_elevation_m": 165.07989116286308,
   "end_elevation_m": 174.99036437960194,
   "min_gradient_pct": -4.740388414791141
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.783154143078065,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 92.0,
   "end_distance_m": 192.0,
   "start_elevation_m": 159.03339917181123,
   "end_elevation_m": 176.8165533148893,
   "min_gradient_pct": -1.4377165927597844
  }
 ],
 "shape": {
  "ascent_concentration": 0.572,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 127.0,
  "shape_class": "stepped"
 },
 "length_m": 313.75899251478273,
 "start_elevation_m": 154.9808927325431,
 "end_elevation_m": 177.20200721653978,
 "endpoint_gain_m": 22.221114483996672,
 "overall_gradient_pct": 7.082223940704974,
 "accumulated_ascent_m": 25.156296352176298,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.661780457074542,
   "start_distance_m": 146.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 148.5,
   "start_elevation_m": 168.09227911434846,
   "end_elevation_m": 169.17536813720218,
   "start_xy": [
    627314.0988636392,
    4575352.0151050445
   ],
   "end_xy": [
    627314.4011076931,
    4575357.005961537
   ]
  },
  "max_10m": {
   "gradient_pct": 21.269446899438265,
   "start_distance_m": 141.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 146.0,
   "start_elevation_m": 167.04842344725836,
   "end_elevation_m": 169.17536813720218,
   "start_xy": [
    627313.7965837975,
    4575347.024250719
   ],
   "end_xy": [
    627314.4011076931,
    4575357.005961537
   ]
  },
  "max_20m": {
   "gradient_pct": 20.792736324641794,
   "start_distance_m": 137.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 147.0,
   "start_elevation_m": 166.22763899882577,
   "end_elevation_m": 170.38618626375413,
   "start_xy": [
    627313.5547142009,
    4575343.0315700285
   ],
   "end_xy": [
    627314.6393246112,
    4575363.001135276
   ]
  },
  "max_25m": {
   "gradient_pct": 20.556497139268117,
   "start_distance_m": 134.0,
   "end_distance_m": 159.0,
   "midpoint_distance_m": 146.5,
   "start_elevation_m": 165.64445589088513,
   "end_elevation_m": 170.78358017570216,
   "start_xy": [
    627313.271513288,
    4575340.045425545
   ],
   "end_xy": [
    627314.7156578423,
    4575364.999678054
   ]
  },
  "max_50m": {
   "gradient_pct": 19.82094643347773,
   "start_distance_m": 131.0,
   "end_distance_m": 181.0,
   "midpoint_distance_m": 156.0,
   "start_elevation_m": 165.07989116286308,
   "end_elevation_m": 174.99036437960194,
   "start_xy": [
    627312.961592974,
    4575337.06147692
   ],
   "end_xy": [
    627318.1452982792,
    4575386.701561864
   ]
  },
  "max_100m": {
   "gradient_pct": 17.783154143078065,
   "start_distance_m": 92.0,
   "end_distance_m": 192.0,
   "midpoint_distance_m": 142.0,
   "start_elevation_m": 159.03339917181123,
   "end_elevation_m": 176.8165533148893,
   "start_xy": [
    627308.010225523,
    4575298.385864641
   ],
   "end_xy": [
    627320.9857096195,
    4575397.318051766
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.574019004961201,
   "start_distance_m": 308.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 310.5,
   "start_elevation_m": 177.91292498209452,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627382.1836367028,
    4575495.648585672
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  },
  "min_10m": {
   "gradient_pct": -11.015815263860986,
   "start_distance_m": 303.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 308.0,
   "start_elevation_m": 178.38580555823256,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627379.2800356923,
    4575491.578069589
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  },
  "min_20m": {
   "gradient_pct": -9.21511558954407,
   "start_distance_m": 293.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 303.0,
   "start_elevation_m": 179.12724714975528,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627373.5009468442,
    4575483.41767718
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  },
  "min_25m": {
   "gradient_pct": -8.032974880464849,
   "start_distance_m": 288.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 300.5,
   "start_elevation_m": 179.29246775196268,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627370.7335841937,
    4575479.253340023
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  },
  "min_50m": {
   "gradient_pct": -4.740388414791141,
   "start_distance_m": 263.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 288.0,
   "start_elevation_m": 179.65441823924203,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627357.0535810897,
    4575458.331022161
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  },
  "min_100m": {
   "gradient_pct": -1.4377165927597844,
   "start_distance_m": 213.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 263.0,
   "start_elevation_m": 178.72194062460625,
   "end_elevation_m": 177.28422403184646,
   "start_xy": [
    627330.5128834308,
    4575415.9693761915
   ],
   "end_xy": [
    627385.0872377135,
    4575499.719101753
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.837630565875088,
   "start_distance_m": 146.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 147.0,
   "start_elevation_m": 168.09227911434846,
   "end_elevation_m": 168.52903172566596,
   "start_xy": [
    627314.0988636392,
    4575352.0151050445
   ],
   "end_xy": [
    627314.2197612607,
    4575354.011447641
   ]
  },
  "max_3m": {
   "gradient_pct": 21.757463952979112,
   "start_distance_m": 147.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 148.5,
   "start_elevation_m": 168.3095076824261,
   "end_elevation_m": 168.96223160101547,
   "start_xy": [
    627314.15931245,
    4575353.013276342
   ],
   "end_xy": [
    627314.3406588823,
    4575356.007790239
   ]
  }
 },
 "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_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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ct/USGS_1M_18_x62y458_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:36:51+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-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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x62y458"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.9% over 200 m (Terrain 50), gain 22.3 m over 314 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": "Ridgefield",
  "county": "Connecticut"
 }
}