{
 "ocl_version": "0.1.0",
 "name": "Heartwood Road",
 "slug": "heartwood-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.92219078878611,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 130.0,
   "start_elevation_m": 416.14672005093075,
   "end_elevation_m": 416.8251638667065,
   "min_gradient_pct": -3.498099386888498
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.097153130601402,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 131.0,
   "start_elevation_m": 416.14672005093075,
   "end_elevation_m": 417.0796346448488,
   "min_gradient_pct": -2.965409474450098
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.102367223645388,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 131.0,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 417.0796346448488,
   "min_gradient_pct": -2.29716632169243
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.715141699924516,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 417.946030453659,
   "min_gradient_pct": -1.6294508063651847
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.867470462415838,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 84.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 409.25831682844614,
   "end_elevation_m": 413.4318109209293,
   "min_gradient_pct": -0.6011639929670309
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.467645947562005,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 79.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 408.3148994340388,
   "end_elevation_m": 413.4318109209293,
   "min_gradient_pct": 0.3386643107796772
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.0945885152247,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 176.0,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 424.1218105412789,
   "min_gradient_pct": 2.143370807330257
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.398260838378974,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 69.0,
   "end_distance_m": 169.0,
   "start_elevation_m": 406.9747515339519,
   "end_elevation_m": 423.3730123723309,
   "min_gradient_pct": 3.706796813191886
  }
 ],
 "shape": {
  "ascent_concentration": 0.372,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 80.0,
  "shape_class": "sustained"
 },
 "length_m": 633.6249302352187,
 "start_elevation_m": 397.67374779939166,
 "end_elevation_m": 463.47994113670705,
 "endpoint_gain_m": 65.80619333731539,
 "overall_gradient_pct": 10.385669849336002,
 "accumulated_ascent_m": 66.08013600146342,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.102367223645388,
   "start_distance_m": 126.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 128.5,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 417.0796346448488,
   "start_xy": [
    657438.1542797039,
    4690767.675489722
   ],
   "end_xy": [
    657436.7105100363,
    4690772.462506449
   ]
  },
  "max_10m": {
   "gradient_pct": 23.715141699924516,
   "start_distance_m": 126.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 131.0,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 417.946030453659,
   "start_xy": [
    657438.1542797039,
    4690767.675489722
   ],
   "end_xy": [
    657435.6174428816,
    4690777.316100444
   ]
  },
  "max_20m": {
   "gradient_pct": 20.867470462415838,
   "start_distance_m": 84.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 94.0,
   "start_elevation_m": 409.25831682844614,
   "end_elevation_m": 413.4318109209293,
   "start_xy": [
    657429.4077583145,
    4690729.101513868
   ],
   "end_xy": [
    657438.2863652599,
    4690745.731711751
   ]
  },
  "max_25m": {
   "gradient_pct": 20.467645947562005,
   "start_distance_m": 79.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 91.5,
   "start_elevation_m": 408.3148994340388,
   "end_elevation_m": 413.4318109209293,
   "start_xy": [
    657424.5573528546,
    4690729.041627049
   ],
   "end_xy": [
    657438.2863652599,
    4690745.731711751
   ]
  },
  "max_50m": {
   "gradient_pct": 17.0945885152247,
   "start_distance_m": 126.0,
   "end_distance_m": 176.0,
   "midpoint_distance_m": 151.0,
   "start_elevation_m": 415.5745162836665,
   "end_elevation_m": 424.1218105412789,
   "start_xy": [
    657438.1542797039,
    4690767.675489722
   ],
   "end_xy": [
    657427.1550873374,
    4690816.246754592
   ]
  },
  "max_100m": {
   "gradient_pct": 16.398260838378974,
   "start_distance_m": 69.0,
   "end_distance_m": 169.0,
   "midpoint_distance_m": 119.0,
   "start_elevation_m": 406.9747515339519,
   "end_elevation_m": 423.3730123723309,
   "start_xy": [
    657415.6959514142,
    4690733.111492839
   ],
   "end_xy": [
    657429.0254219014,
    4690809.501248783
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.29716632169243,
   "start_distance_m": 562.0,
   "end_distance_m": 567.0,
   "midpoint_distance_m": 564.5,
   "start_elevation_m": 460.7229745254155,
   "end_elevation_m": 460.6081162093309,
   "start_xy": [
    657473.5550370563,
    4691165.263070808
   ],
   "end_xy": [
    657472.4294588761,
    4691170.13375467
   ]
  },
  "min_10m": {
   "gradient_pct": -1.6294508063651847,
   "start_distance_m": 557.0,
   "end_distance_m": 567.0,
   "midpoint_distance_m": 562.0,
   "start_elevation_m": 460.7710612899674,
   "end_elevation_m": 460.6081162093309,
   "start_xy": [
    657474.6677738645,
    4691160.388461408
   ],
   "end_xy": [
    657472.4294588761,
    4691170.13375467
   ]
  },
  "min_20m": {
   "gradient_pct": -0.6011639929670309,
   "start_distance_m": 548.0,
   "end_distance_m": 568.0,
   "midpoint_distance_m": 558.0,
   "start_elevation_m": 460.74483574446424,
   "end_elevation_m": 460.62460294587083,
   "start_xy": [
    657476.6707001189,
    4691151.61416449
   ],
   "end_xy": [
    657472.0688512359,
    4691171.066472274
   ]
  },
  "min_25m": {
   "gradient_pct": 0.3386643107796772,
   "start_distance_m": 548.0,
   "end_distance_m": 573.0,
   "midpoint_distance_m": 560.5,
   "start_elevation_m": 460.74483574446424,
   "end_elevation_m": 460.82950182215916,
   "start_xy": [
    657476.6707001189,
    4691151.61416449
   ],
   "end_xy": [
    657470.2658130345,
    4691175.730060297
   ]
  },
  "min_50m": {
   "gradient_pct": 2.143370807330257,
   "start_distance_m": 548.0,
   "end_distance_m": 598.0,
   "midpoint_distance_m": 573.0,
   "start_elevation_m": 460.74483574446424,
   "end_elevation_m": 461.81652114812937,
   "start_xy": [
    657476.6707001189,
    4691151.61416449
   ],
   "end_xy": [
    657461.2506220274,
    4691199.048000409
   ]
  },
  "min_100m": {
   "gradient_pct": 3.706796813191886,
   "start_distance_m": 533.0,
   "end_distance_m": 633.0,
   "midpoint_distance_m": 583.0,
   "start_elevation_m": 459.7537149880576,
   "end_elevation_m": 463.4605118012495,
   "start_xy": [
    657479.465946841,
    4691136.8841276355
   ],
   "end_xy": [
    657448.6293546174,
    4691231.693116568
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.92219078878611,
   "start_distance_m": 128.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 129.0,
   "start_elevation_m": 416.14672005093075,
   "end_elevation_m": 416.8251638667065,
   "start_xy": [
    657437.5767718368,
    4690769.590296412
   ],
   "end_xy": [
    657436.9992639698,
    4690771.505103103
   ]
  },
  "max_3m": {
   "gradient_pct": 31.097153130601402,
   "start_distance_m": 128.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 129.5,
   "start_elevation_m": 416.14672005093075,
   "end_elevation_m": 417.0796346448488,
   "start_xy": [
    657437.5767718368,
    4690769.590296412
   ],
   "end_xy": [
    657436.7105100363,
    4690772.462506449
   ]
  }
 },
 "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"
  ]
 },
 "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_x65y470_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:44:49+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": [
   "x65y470"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.5% over 200 m (Terrain 50), gain 65.5 m over 634 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": "Washington",
  "county": "Massachusetts"
 }
}