{
 "ocl_version": "0.1.0",
 "name": "High Street Hill Road",
 "slug": "high-street-hill-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 54.462139840137525,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 914.0,
   "end_distance_m": 916.0,
   "start_elevation_m": 489.59033535898755,
   "end_elevation_m": 490.6795781557903,
   "min_gradient_pct": -21.638750658280514
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 51.65260248904057,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 914.0,
   "end_distance_m": 917.0,
   "start_elevation_m": 489.59033535898755,
   "end_elevation_m": 491.13991343365876,
   "min_gradient_pct": -17.664705772815143
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 41.23082300622741,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 913.0,
   "end_distance_m": 918.0,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 491.36061853368386,
   "min_gradient_pct": -14.178067097167286
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.143435654899235,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 492.3134209488624,
   "min_gradient_pct": -11.624275612402357
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.098364647370772,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 910.0,
   "end_distance_m": 930.0,
   "start_elevation_m": 488.91772048902203,
   "end_elevation_m": 493.9373934184962,
   "min_gradient_pct": -9.315273416354728
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.93220266019307,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 905.0,
   "end_distance_m": 930.0,
   "start_elevation_m": 488.2043427534479,
   "end_elevation_m": 493.9373934184962,
   "min_gradient_pct": -7.952685762043757
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.317388780104693,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 877.0,
   "end_distance_m": 927.0,
   "start_elevation_m": 483.837650143191,
   "end_elevation_m": 493.49634453324336,
   "min_gradient_pct": -5.148379855223197
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.874151988103904,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 913.0,
   "end_distance_m": 1013.0,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 507.1732293714764,
   "min_gradient_pct": -2.4451480449617975
  }
 ],
 "shape": {
  "ascent_concentration": 0.378,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 260.0,
  "shape_class": "sustained"
 },
 "length_m": 1502.9999999997335,
 "start_elevation_m": 413.9688474426249,
 "end_elevation_m": 547.3907384252038,
 "endpoint_gain_m": 133.42189098257893,
 "overall_gradient_pct": 8.877038654863778,
 "accumulated_ascent_m": 139.84693533114182,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 41.23082300622741,
   "start_distance_m": 913.0,
   "end_distance_m": 918.0,
   "midpoint_distance_m": 915.5,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 491.36061853368386,
   "start_xy": [
    664281.2213817633,
    4707950.323799337
   ],
   "end_xy": [
    664278.0225258108,
    4707946.4809724195
   ]
  },
  "max_10m": {
   "gradient_pct": 30.143435654899235,
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "midpoint_distance_m": 918.0,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 492.3134209488624,
   "start_xy": [
    664281.2213817633,
    4707950.323799337
   ],
   "end_xy": [
    664274.8237043507,
    4707942.638116817
   ]
  },
  "max_20m": {
   "gradient_pct": 25.098364647370772,
   "start_distance_m": 910.0,
   "end_distance_m": 930.0,
   "midpoint_distance_m": 920.0,
   "start_elevation_m": 488.91772048902203,
   "end_elevation_m": 493.9373934184962,
   "start_xy": [
    664283.1403604421,
    4707952.629773718
   ],
   "end_xy": [
    664270.367641577,
    4707937.239652984
   ]
  },
  "max_25m": {
   "gradient_pct": 22.93220266019307,
   "start_distance_m": 905.0,
   "end_distance_m": 930.0,
   "midpoint_distance_m": 917.5,
   "start_elevation_m": 488.2043427534479,
   "end_elevation_m": 493.9373934184962,
   "start_xy": [
    664286.2963490856,
    4707956.507855382
   ],
   "end_xy": [
    664270.367641577,
    4707937.239652984
   ]
  },
  "max_50m": {
   "gradient_pct": 19.317388780104693,
   "start_distance_m": 877.0,
   "end_distance_m": 927.0,
   "midpoint_distance_m": 902.0,
   "start_elevation_m": 483.837650143191,
   "end_elevation_m": 493.49634453324336,
   "start_xy": [
    664305.4356690864,
    4707976.848482871
   ],
   "end_xy": [
    664272.2756744499,
    4707939.554692885
   ]
  },
  "max_100m": {
   "gradient_pct": 17.874151988103904,
   "start_distance_m": 913.0,
   "end_distance_m": 1013.0,
   "midpoint_distance_m": 963.0,
   "start_elevation_m": 489.2990773833725,
   "end_elevation_m": 507.1732293714764,
   "start_xy": [
    664281.2213817633,
    4707950.323799337
   ],
   "end_xy": [
    664208.7906945758,
    4707882.073429478
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -14.178067097167286,
   "start_distance_m": 774.0,
   "end_distance_m": 779.0,
   "midpoint_distance_m": 776.5,
   "start_elevation_m": 478.41884761303504,
   "end_elevation_m": 477.7099442581767,
   "start_xy": [
    664380.2566074809,
    4708045.248564095
   ],
   "end_xy": [
    664375.6888590548,
    4708043.215597224
   ]
  },
  "min_10m": {
   "gradient_pct": -11.624275612402357,
   "start_distance_m": 774.0,
   "end_distance_m": 784.0,
   "midpoint_distance_m": 779.0,
   "start_elevation_m": 478.41884761303504,
   "end_elevation_m": 477.2564200517948,
   "start_xy": [
    664380.2566074809,
    4708045.248564095
   ],
   "end_xy": [
    664371.1310871897,
    4708041.159700148
   ]
  },
  "min_20m": {
   "gradient_pct": -9.315273416354728,
   "start_distance_m": 774.0,
   "end_distance_m": 794.0,
   "midpoint_distance_m": 784.0,
   "start_elevation_m": 478.41884761303504,
   "end_elevation_m": 476.5557929297641,
   "start_xy": [
    664380.2566074809,
    4708045.248564095
   ],
   "end_xy": [
    664362.8366400552,
    4708035.710039941
   ]
  },
  "min_25m": {
   "gradient_pct": -7.952685762043757,
   "start_distance_m": 774.0,
   "end_distance_m": 799.0,
   "midpoint_distance_m": 786.5,
   "start_elevation_m": 478.41884761303504,
   "end_elevation_m": 476.4306761725241,
   "start_xy": [
    664380.2566074809,
    4708045.248564095
   ],
   "end_xy": [
    664358.6288646117,
    4708033.009183955
   ]
  },
  "min_50m": {
   "gradient_pct": -5.148379855223197,
   "start_distance_m": 749.0,
   "end_distance_m": 799.0,
   "midpoint_distance_m": 774.0,
   "start_elevation_m": 479.0048661001357,
   "end_elevation_m": 476.4306761725241,
   "start_xy": [
    664403.3388403002,
    4708054.848301654
   ],
   "end_xy": [
    664358.6288646117,
    4708033.009183955
   ]
  },
  "min_100m": {
   "gradient_pct": -2.4451480449617975,
   "start_distance_m": 715.0,
   "end_distance_m": 815.0,
   "midpoint_distance_m": 765.0,
   "start_elevation_m": 478.98466680198163,
   "end_elevation_m": 476.53951875701983,
   "start_xy": [
    664435.9956785219,
    4708064.1659009075
   ],
   "end_xy": [
    664345.5038987474,
    4708024.006304799
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 54.462139840137525,
   "start_distance_m": 914.0,
   "end_distance_m": 916.0,
   "midpoint_distance_m": 915.0,
   "start_elevation_m": 489.59033535898755,
   "end_elevation_m": 490.6795781557903,
   "start_xy": [
    664280.5816603831,
    4707949.555192459
   ],
   "end_xy": [
    664279.3018178694,
    4707948.018311618
   ]
  },
  "max_3m": {
   "gradient_pct": 51.65260248904057,
   "start_distance_m": 914.0,
   "end_distance_m": 917.0,
   "midpoint_distance_m": 915.5,
   "start_elevation_m": 489.59033535898755,
   "end_elevation_m": 491.13991343365876,
   "start_xy": [
    664280.5816603831,
    4707949.555192459
   ],
   "end_xy": [
    664278.662218512,
    4707947.249603181
   ]
  }
 },
 "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": 0.66,
   "obstruction_max_height_m": 27.14,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [
   "short_window_divergence"
  ],
  "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_x66y471_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-03T22:42:09+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": "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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x66y471"
  ],
  "route_cut_m": 1503.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_MA_ME_MA_QL2_UTM18_L1_2015_LAS_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.997,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Windsor",
  "county": "Massachusetts"
 }
}