{
 "ocl_version": "0.1.0",
 "name": "Reservoir Road",
 "slug": "reservoir-road-3",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 40.19991631462361,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 969.0,
   "end_distance_m": 971.0,
   "start_elevation_m": 101.51875657302033,
   "end_elevation_m": 102.3227548993128,
   "min_gradient_pct": -46.79999811575044
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.2064043951469,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1231.0,
   "end_distance_m": 1234.0,
   "start_elevation_m": 126.96242362706087,
   "end_elevation_m": 128.13861575891528,
   "min_gradient_pct": -42.29606729207186
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.65497321592136,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1230.0,
   "end_distance_m": 1235.0,
   "start_elevation_m": 126.58425218943097,
   "end_elevation_m": 128.46700085022704,
   "min_gradient_pct": -33.52125973564
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.39578361127897,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1225.0,
   "end_distance_m": 1235.0,
   "start_elevation_m": 125.22742248909914,
   "end_elevation_m": 128.46700085022704,
   "min_gradient_pct": -16.241913865608524
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.238691329777495,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1220.0,
   "end_distance_m": 1240.0,
   "start_elevation_m": 124.60899271035275,
   "end_elevation_m": 129.45673097630825,
   "min_gradient_pct": -8.890013619081572
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.42209225873421,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1215.0,
   "end_distance_m": 1240.0,
   "start_elevation_m": 124.1012079116247,
   "end_elevation_m": 129.45673097630825,
   "min_gradient_pct": -8.662204548024533
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.754587166628937,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2192.0,
   "end_distance_m": 2242.0,
   "start_elevation_m": 217.38515608392336,
   "end_elevation_m": 226.76244966723783,
   "min_gradient_pct": -7.226015028778066
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.50497038468538,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2142.0,
   "end_distance_m": 2242.0,
   "start_elevation_m": 211.25747928255245,
   "end_elevation_m": 226.76244966723783,
   "min_gradient_pct": -3.8736434458496234
  }
 ],
 "shape": {
  "ascent_concentration": 0.325,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 97.0,
  "shape_class": "sustained"
 },
 "length_m": 2242.1611952466205,
 "start_elevation_m": 52.61040367175103,
 "end_elevation_m": 226.79301571923065,
 "endpoint_gain_m": 174.1826120474796,
 "overall_gradient_pct": 7.768514253870175,
 "accumulated_ascent_m": 190.05722686979044,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.65497321592136,
   "start_distance_m": 1230.0,
   "end_distance_m": 1235.0,
   "midpoint_distance_m": 1232.5,
   "start_elevation_m": 126.58425218943097,
   "end_elevation_m": 128.46700085022704,
   "start_xy": [
    701020.3029992066,
    4703750.490914071
   ],
   "end_xy": [
    701025.196946542,
    4703751.45766757
   ]
  },
  "max_10m": {
   "gradient_pct": 32.39578361127897,
   "start_distance_m": 1225.0,
   "end_distance_m": 1235.0,
   "midpoint_distance_m": 1230.0,
   "start_elevation_m": 125.22742248909914,
   "end_elevation_m": 128.46700085022704,
   "start_xy": [
    701015.3030326914,
    4703750.50921288
   ],
   "end_xy": [
    701025.196946542,
    4703751.45766757
   ]
  },
  "max_20m": {
   "gradient_pct": 24.238691329777495,
   "start_distance_m": 1220.0,
   "end_distance_m": 1240.0,
   "midpoint_distance_m": 1230.0,
   "start_elevation_m": 124.60899271035275,
   "end_elevation_m": 129.45673097630825,
   "start_xy": [
    701010.3753387273,
    4703751.241055842
   ],
   "end_xy": [
    701030.0785086777,
    4703752.539495244
   ]
  },
  "max_25m": {
   "gradient_pct": 21.42209225873421,
   "start_distance_m": 1215.0,
   "end_distance_m": 1240.0,
   "midpoint_distance_m": 1227.5,
   "start_elevation_m": 124.1012079116247,
   "end_elevation_m": 129.45673097630825,
   "start_xy": [
    701005.473250547,
    4703752.225703734
   ],
   "end_xy": [
    701030.0785086777,
    4703752.539495244
   ]
  },
  "max_50m": {
   "gradient_pct": 18.754587166628937,
   "start_distance_m": 2192.0,
   "end_distance_m": 2242.0,
   "midpoint_distance_m": 2217.0,
   "start_elevation_m": 217.38515608392336,
   "end_elevation_m": 226.76244966723783,
   "start_xy": [
    701690.2921961688,
    4704350.900726421
   ],
   "end_xy": [
    701738.6852790003,
    4704353.60564412
   ]
  },
  "max_100m": {
   "gradient_pct": 15.50497038468538,
   "start_distance_m": 2142.0,
   "end_distance_m": 2242.0,
   "midpoint_distance_m": 2192.0,
   "start_elevation_m": 211.25747928255245,
   "end_elevation_m": 226.76244966723783,
   "start_xy": [
    701660.4417230557,
    4704312.470387955
   ],
   "end_xy": [
    701738.6852790003,
    4704353.60564412
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -33.52125973564,
   "start_distance_m": 1307.0,
   "end_distance_m": 1312.0,
   "midpoint_distance_m": 1309.5,
   "start_elevation_m": 133.44237584835147,
   "end_elevation_m": 131.76631286156947,
   "start_xy": [
    701084.2108669926,
    4703790.865140311
   ],
   "end_xy": [
    701087.4908342795,
    4703794.63897319
   ]
  },
  "min_10m": {
   "gradient_pct": -16.241913865608524,
   "start_distance_m": 1305.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1310.0,
   "start_elevation_m": 133.38670063003306,
   "end_elevation_m": 131.7625092434722,
   "start_xy": [
    701082.8988800779,
    4703789.355607159
   ],
   "end_xy": [
    701089.4588146515,
    4703796.9032729175
   ]
  },
  "min_20m": {
   "gradient_pct": -8.890013619081572,
   "start_distance_m": 423.0,
   "end_distance_m": 443.0,
   "midpoint_distance_m": 433.0,
   "start_elevation_m": 66.04446843990024,
   "end_elevation_m": 64.26646571608393,
   "start_xy": [
    700277.4377410845,
    4703636.122811638
   ],
   "end_xy": [
    700296.7432797718,
    4703641.274935796
   ]
  },
  "min_25m": {
   "gradient_pct": -8.662204548024533,
   "start_distance_m": 421.0,
   "end_distance_m": 446.0,
   "midpoint_distance_m": 433.5,
   "start_elevation_m": 66.20443730916566,
   "end_elevation_m": 64.03888617215952,
   "start_xy": [
    700275.4701542223,
    4703635.817948054
   ],
   "end_xy": [
    700299.6113586042,
    4703642.154778857
   ]
  },
  "min_50m": {
   "gradient_pct": -7.226015028778066,
   "start_distance_m": 417.0,
   "end_distance_m": 467.0,
   "midpoint_distance_m": 442.0,
   "start_elevation_m": 66.45918297348062,
   "end_elevation_m": 62.84617545909159,
   "start_xy": [
    700271.4702180496,
    4703635.840544814
   ],
   "end_xy": [
    700319.8637594638,
    4703647.67168978
   ]
  },
  "min_100m": {
   "gradient_pct": -3.8736434458496234,
   "start_distance_m": 402.0,
   "end_distance_m": 502.0,
   "midpoint_distance_m": 452.0,
   "start_elevation_m": 66.84981839609176,
   "end_elevation_m": 62.97617495024214,
   "start_xy": [
    700256.5504453178,
    4703636.913065487
   ],
   "end_xy": [
    700348.4177411876,
    4703666.512930205
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 40.19991631462361,
   "start_distance_m": 969.0,
   "end_distance_m": 971.0,
   "midpoint_distance_m": 970.0,
   "start_elevation_m": 101.51875657302033,
   "end_elevation_m": 102.3227548993128,
   "start_xy": [
    700784.0250918651,
    4703702.591590893
   ],
   "end_xy": [
    700785.8330236343,
    4703701.736381727
   ]
  },
  "max_3m": {
   "gradient_pct": 39.2064043951469,
   "start_distance_m": 1231.0,
   "end_distance_m": 1234.0,
   "midpoint_distance_m": 1232.5,
   "start_elevation_m": 126.96242362706087,
   "end_elevation_m": 128.13861575891528,
   "start_xy": [
    701021.2916968336,
    4703750.59220543
   ],
   "end_xy": [
    701024.2206341149,
    4703751.241302035
   ]
  }
 },
 "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": [
   "may_start_earlier",
   "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ma/USGS_1M_18_x69y471_MA_Western_B24.tif",
   "data/cache/usa/ma/USGS_1M_18_x70y471_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:43:53+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-ma-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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x69y471",
   "x70y471"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.6% over 200 m (Terrain 50), gain 162.9 m over 1902 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. 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": "Sunderland",
  "county": "Massachusetts"
 }
}