{
 "ocl_version": "0.1.0",
 "name": "Talcot Road",
 "slug": "talcot-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.959289613940314,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 612.0,
   "end_distance_m": 614.0,
   "start_elevation_m": 300.75333292101556,
   "end_elevation_m": 301.69251871329436,
   "min_gradient_pct": -20.076428521292655,
   "suppressed_max_gradient_pct": 59.07075975808027,
   "suppressed_location_m": [
    1633.0,
    1635.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 45.09346239419756,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 435.0,
   "end_distance_m": 438.0,
   "start_elevation_m": 272.00699071378887,
   "end_elevation_m": 273.3597945856148,
   "min_gradient_pct": -19.881511501491406,
   "suppressed_max_gradient_pct": 54.79964506391184,
   "suppressed_location_m": [
    1633.0,
    1636.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 40.61810709003453,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 710.0,
   "end_distance_m": 715.0,
   "start_elevation_m": 313.6451887952777,
   "end_elevation_m": 315.67609414977943,
   "min_gradient_pct": -19.445239417952962,
   "suppressed_max_gradient_pct": 45.990482775754344,
   "suppressed_location_m": [
    1631.0,
    1636.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 33.72493723796538,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 434.0,
   "end_distance_m": 444.0,
   "start_elevation_m": 271.63488706392667,
   "end_elevation_m": 275.0073807877232,
   "min_gradient_pct": -18.798717230437205,
   "suppressed_max_gradient_pct": 37.72407485410383,
   "suppressed_location_m": [
    1631.0,
    1641.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.525275773574606,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 430.0,
   "end_distance_m": 450.0,
   "start_elevation_m": 270.6041030365285,
   "end_elevation_m": 275.9091581912434,
   "min_gradient_pct": -18.49593434842859,
   "suppressed_max_gradient_pct": 30.050127908383786,
   "suppressed_location_m": [
    1624.0,
    1644.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.63154279621199,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 416.0,
   "end_distance_m": 441.0,
   "start_elevation_m": 267.7132071062269,
   "end_elevation_m": 274.1210928052799,
   "min_gradient_pct": -17.973866686539168,
   "suppressed_max_gradient_pct": 27.672962647479835,
   "suppressed_location_m": [
    1620.0,
    1645.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.762670500967488,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 402.0,
   "end_distance_m": 452.0,
   "start_elevation_m": 264.8077217640075,
   "end_elevation_m": 276.18905701449125,
   "min_gradient_pct": -14.521477612677472
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.901121225546717,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2136.0,
   "end_distance_m": 2236.0,
   "start_elevation_m": 435.01973007327945,
   "end_elevation_m": 454.92085129882616,
   "min_gradient_pct": -9.300309530542904,
   "suppressed_max_gradient_pct": 21.503493324016116,
   "suppressed_location_m": [
    1544.0,
    1644.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.355,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 200.0,
  "shape_class": "sustained"
 },
 "length_m": 2641.328664888002,
 "start_elevation_m": 213.51542477190742,
 "end_elevation_m": 478.003546536249,
 "endpoint_gain_m": 264.4881217643416,
 "overall_gradient_pct": 10.013449870145427,
 "accumulated_ascent_m": 283.93645871113654,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 40.61810709003453,
   "start_distance_m": 710.0,
   "end_distance_m": 715.0,
   "midpoint_distance_m": 712.5,
   "start_elevation_m": 313.6451887952777,
   "end_elevation_m": 315.67609414977943,
   "start_xy": [
    284135.7341140015,
    4837420.476031295
   ],
   "end_xy": [
    284131.1399362922,
    4837418.502828017
   ]
  },
  "max_10m": {
   "gradient_pct": 33.72493723796538,
   "start_distance_m": 434.0,
   "end_distance_m": 444.0,
   "midpoint_distance_m": 439.0,
   "start_elevation_m": 271.63488706392667,
   "end_elevation_m": 275.0073807877232,
   "start_xy": [
    284395.6771091993,
    4837512.49232261
   ],
   "end_xy": [
    284386.0221290012,
    4837509.888218661
   ]
  },
  "max_20m": {
   "gradient_pct": 26.525275773574606,
   "start_distance_m": 430.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 440.0,
   "start_elevation_m": 270.6041030365285,
   "end_elevation_m": 275.9091581912434,
   "start_xy": [
    284399.5391012785,
    4837513.533964189
   ],
   "end_xy": [
    284380.2291408824,
    4837508.325756292
   ]
  },
  "max_25m": {
   "gradient_pct": 25.63154279621199,
   "start_distance_m": 416.0,
   "end_distance_m": 441.0,
   "midpoint_distance_m": 428.5,
   "start_elevation_m": 267.7132071062269,
   "end_elevation_m": 274.1210928052799,
   "start_xy": [
    284412.6005601261,
    4837518.561047915
   ],
   "end_xy": [
    284388.9186230606,
    4837510.669449845
   ]
  },
  "max_50m": {
   "gradient_pct": 22.762670500967488,
   "start_distance_m": 402.0,
   "end_distance_m": 452.0,
   "midpoint_distance_m": 427.0,
   "start_elevation_m": 264.8077217640075,
   "end_elevation_m": 276.18905701449125,
   "start_xy": [
    284425.6347340902,
    4837523.670872675
   ],
   "end_xy": [
    284378.2981448428,
    4837507.804935502
   ]
  },
  "max_100m": {
   "gradient_pct": 19.901121225546717,
   "start_distance_m": 2136.0,
   "end_distance_m": 2236.0,
   "midpoint_distance_m": 2186.0,
   "start_elevation_m": 435.01973007327945,
   "end_elevation_m": 454.92085129882616,
   "start_xy": [
    282768.7176459231,
    4837490.302632928
   ],
   "end_xy": [
    282669.6896006679,
    4837481.06472315
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -19.445239417952962,
   "start_distance_m": 1932.0,
   "end_distance_m": 1937.0,
   "midpoint_distance_m": 1934.5,
   "start_elevation_m": 419.9899057863035,
   "end_elevation_m": 419.01764381540585,
   "start_xy": [
    282958.60442814237,
    4837427.930616218
   ],
   "end_xy": [
    282954.27096490725,
    4837430.424828798
   ]
  },
  "min_10m": {
   "gradient_pct": -18.798717230437205,
   "start_distance_m": 1933.0,
   "end_distance_m": 1943.0,
   "midpoint_distance_m": 1938.0,
   "start_elevation_m": 419.8061225876327,
   "end_elevation_m": 417.92625086458895,
   "start_xy": [
    282957.7377354953,
    4837428.429458734
   ],
   "end_xy": [
    282949.07080902514,
    4837433.417883893
   ]
  },
  "min_20m": {
   "gradient_pct": -18.49593434842859,
   "start_distance_m": 1933.0,
   "end_distance_m": 1953.0,
   "midpoint_distance_m": 1943.0,
   "start_elevation_m": 419.8061225876327,
   "end_elevation_m": 416.10693571794695,
   "start_xy": [
    282957.7377354953,
    4837428.429458734
   ],
   "end_xy": [
    282940.03775560245,
    4837437.672731519
   ]
  },
  "min_25m": {
   "gradient_pct": -17.973866686539168,
   "start_distance_m": 1929.0,
   "end_distance_m": 1954.0,
   "midpoint_distance_m": 1941.5,
   "start_elevation_m": 420.4631465241044,
   "end_elevation_m": 415.9696798524696,
   "start_xy": [
    282961.20450608345,
    4837426.434088671
   ],
   "end_xy": [
    282939.11809795507,
    4837438.065452554
   ]
  },
  "min_50m": {
   "gradient_pct": -14.521477612677472,
   "start_distance_m": 1922.0,
   "end_distance_m": 1972.0,
   "midpoint_distance_m": 1947.0,
   "start_elevation_m": 421.11544665039713,
   "end_elevation_m": 413.8547078440584,
   "start_xy": [
    282967.1890715718,
    4837422.8075645575
   ],
   "end_xy": [
    282922.56426030246,
    4837445.134431191
   ]
  },
  "min_100m": {
   "gradient_pct": -9.300309530542904,
   "start_distance_m": 1872.0,
   "end_distance_m": 1972.0,
   "midpoint_distance_m": 1922.0,
   "start_elevation_m": 423.1550173746013,
   "end_elevation_m": 413.8547078440584,
   "start_xy": [
    283012.982579588,
    4837403.71896289
   ],
   "end_xy": [
    282922.56426030246,
    4837445.134431191
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.959289613940314,
   "start_distance_m": 612.0,
   "end_distance_m": 614.0,
   "midpoint_distance_m": 613.0,
   "start_elevation_m": 300.75333292101556,
   "end_elevation_m": 301.69251871329436,
   "start_xy": [
    284226.5499753008,
    4837457.205866422
   ],
   "end_xy": [
    284224.6700209637,
    4837456.52339174
   ]
  },
  "max_3m": {
   "gradient_pct": 45.09346239419756,
   "start_distance_m": 435.0,
   "end_distance_m": 438.0,
   "midpoint_distance_m": 436.5,
   "start_elevation_m": 272.00699071378887,
   "end_elevation_m": 273.3597945856148,
   "start_xy": [
    284394.71161117946,
    4837512.231912214
   ],
   "end_xy": [
    284391.81511712004,
    4837511.45068103
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.012,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.591,
   "obstruction_max_height_m": 29.13,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    1620.0,
    1650.0
   ]
  ],
  "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/nh/USGS_one_meter_x28y484_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-09-05T00:03:03+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "hunt-wave2-260905",
  "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, NH_CT_RiverNorthL6_2015 (collected 2015)",
  "elevation_tile_ids": [
   "x28y484"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_CT_River_Lot6_Winnipesaulee_2015_LAS_2017",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.998,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bridgewater",
  "county": "New Hampshire"
 }
}