{
 "ocl_version": "0.1.0",
 "name": "Old Francestown Road",
 "slug": "old-francestown-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.547625791160044,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 96.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 271.10242988796983,
   "end_elevation_m": 271.85338240379303,
   "min_gradient_pct": -15.343792915396648
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.111848123053356,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 270.80002696010143,
   "end_elevation_m": 271.85338240379303,
   "min_gradient_pct": -14.960292902558573
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.76755674389642,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 270.64173829739457,
   "end_elevation_m": 272.0801161345894,
   "min_gradient_pct": -13.898923830502099
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.904671848328917,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 88.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 269.06291521896014,
   "end_elevation_m": 271.85338240379303,
   "min_gradient_pct": -12.988655004112957
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.934742291523207,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 83.0,
   "end_distance_m": 103.0,
   "start_elevation_m": 267.88020346489907,
   "end_elevation_m": 273.0671519232037,
   "min_gradient_pct": -11.806244231194398
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.17154227288188,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 82.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 267.679566254205,
   "end_elevation_m": 273.72245182242546,
   "min_gradient_pct": -11.4596865944618
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.48625722762171,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 14.0,
   "end_distance_m": 64.0,
   "start_elevation_m": 254.50511132642495,
   "end_elevation_m": 265.2482399402358,
   "min_gradient_pct": -10.827664839476483
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.51579648598982,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 13.0,
   "end_distance_m": 113.0,
   "start_elevation_m": 254.36539807521024,
   "end_elevation_m": 274.88119456120006,
   "min_gradient_pct": -9.596000640111185
  }
 ],
 "shape": {
  "ascent_concentration": 0.425,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 },
 "length_m": 1186.9761292918581,
 "start_elevation_m": 254.10524726255503,
 "end_elevation_m": 283.1182219733807,
 "endpoint_gain_m": 29.01297471082566,
 "overall_gradient_pct": 2.4442761732819855,
 "accumulated_ascent_m": 60.47822947138573,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.76755674389642,
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 270.64173829739457,
   "end_elevation_m": 272.0801161345894,
   "start_xy": [
    270800.63505066594,
    4770104.7682080455
   ],
   "end_xy": [
    270803.5971551533,
    4770100.740065788
   ]
  },
  "max_10m": {
   "gradient_pct": 27.904671848328917,
   "start_distance_m": 88.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 93.0,
   "start_elevation_m": 269.06291521896014,
   "end_elevation_m": 271.85338240379303,
   "start_xy": [
    270797.07985088864,
    4770109.601483167
   ],
   "end_xy": [
    270803.00406257133,
    4770101.545200051
   ]
  },
  "max_20m": {
   "gradient_pct": 25.934742291523207,
   "start_distance_m": 83.0,
   "end_distance_m": 103.0,
   "midpoint_distance_m": 93.0,
   "start_elevation_m": 267.88020346489907,
   "end_elevation_m": 273.0671519232037,
   "start_xy": [
    270794.11709980114,
    4770113.629149511
   ],
   "end_xy": [
    270805.96681369917,
    4770097.517533736
   ]
  },
  "max_25m": {
   "gradient_pct": 24.17154227288188,
   "start_distance_m": 82.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 94.5,
   "start_elevation_m": 267.679566254205,
   "end_elevation_m": 273.72245182242546,
   "start_xy": [
    270793.52512541134,
    4770114.435106281
   ],
   "end_xy": [
    270808.33629974537,
    4770094.294874208
   ]
  },
  "max_50m": {
   "gradient_pct": 21.48625722762171,
   "start_distance_m": 14.0,
   "end_distance_m": 64.0,
   "midpoint_distance_m": 39.0,
   "start_elevation_m": 254.50511132642495,
   "end_elevation_m": 265.2482399402358,
   "start_xy": [
    270753.2381316918,
    4770169.21609773
   ],
   "end_xy": [
    270782.8611252671,
    4770128.936106478
   ]
  },
  "max_100m": {
   "gradient_pct": 20.51579648598982,
   "start_distance_m": 13.0,
   "end_distance_m": 113.0,
   "midpoint_distance_m": 63.0,
   "start_elevation_m": 254.36539807521024,
   "end_elevation_m": 274.88119456120006,
   "start_xy": [
    270752.6455146648,
    4770170.021582092
   ],
   "end_xy": [
    270811.8910256243,
    4770089.461250206
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.898923830502099,
   "start_distance_m": 245.0,
   "end_distance_m": 250.0,
   "midpoint_distance_m": 247.5,
   "start_elevation_m": 273.70859128528707,
   "end_elevation_m": 273.01364509376197,
   "start_xy": [
    270919.3329697666,
    4770016.989571417
   ],
   "end_xy": [
    270923.90153004654,
    4770014.957762104
   ]
  },
  "min_10m": {
   "gradient_pct": -12.988655004112957,
   "start_distance_m": 793.0,
   "end_distance_m": 803.0,
   "midpoint_distance_m": 798.0,
   "start_elevation_m": 274.6412187985044,
   "end_elevation_m": 273.3423532980931,
   "start_xy": [
    271388.39944714453,
    4769740.978678749
   ],
   "end_xy": [
    271397.3161480581,
    4769736.451823714
   ]
  },
  "min_20m": {
   "gradient_pct": -11.806244231194398,
   "start_distance_m": 788.0,
   "end_distance_m": 808.0,
   "midpoint_distance_m": 798.0,
   "start_elevation_m": 275.19247636170417,
   "end_elevation_m": 272.8312275154653,
   "start_xy": [
    271383.94099340413,
    4769743.241902343
   ],
   "end_xy": [
    271401.7746018342,
    4769734.18860019
   ]
  },
  "min_25m": {
   "gradient_pct": -11.4596865944618,
   "start_distance_m": 787.0,
   "end_distance_m": 812.0,
   "midpoint_distance_m": 799.5,
   "start_elevation_m": 275.2850118429519,
   "end_elevation_m": 272.42009019433647,
   "start_xy": [
    271383.0493852687,
    4769743.694710172
   ],
   "end_xy": [
    271405.3412436686,
    4769732.377782083
   ]
  },
  "min_50m": {
   "gradient_pct": -10.827664839476483,
   "start_distance_m": 213.0,
   "end_distance_m": 263.0,
   "midpoint_distance_m": 238.0,
   "start_elevation_m": 277.1187385719658,
   "end_elevation_m": 271.7049061522276,
   "start_xy": [
    270890.0930199514,
    4770029.990538162
   ],
   "end_xy": [
    270935.9299796308,
    4770010.031025335
   ]
  },
  "min_100m": {
   "gradient_pct": -9.596000640111185,
   "start_distance_m": 732.0,
   "end_distance_m": 832.0,
   "midpoint_distance_m": 782.0,
   "start_elevation_m": 280.0122976219725,
   "end_elevation_m": 270.4162969818613,
   "start_xy": [
    271334.00721467717,
    4769768.591789844
   ],
   "end_xy": [
    271423.1748518571,
    4769723.324473216
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.547625791160044,
   "start_distance_m": 96.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 97.0,
   "start_elevation_m": 271.10242988796983,
   "end_elevation_m": 271.85338240379303,
   "start_xy": [
    270801.8194711772,
    4770103.156641199
   ],
   "end_xy": [
    270803.00406257133,
    4770101.545200051
   ]
  },
  "max_3m": {
   "gradient_pct": 35.111848123053356,
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 270.80002696010143,
   "end_elevation_m": 271.85338240379303,
   "start_xy": [
    270801.22702269803,
    4770103.962249541
   ],
   "end_xy": [
    270803.00406257133,
    4770101.545200051
   ]
  }
 },
 "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": 0.657,
   "obstruction_max_height_m": 30.94,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "8f4becd2ed8ab26772f5cd961ca7d1d0c2823252",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "remeasure-valley-260921-us",
   "road_pbf": "batch-usa-nh-chunk000.pbf",
   "region_key": "usa-nh",
   "crs": "EPSG:26919",
   "elevation_provider_key": "usa3dep",
   "authority": "usa-inventory",
   "registry_pbf": "new-hampshire-260822.osm.pbf",
   "tile_index_snapshot": "sha256:a6761db8145ddd53"
  },
  "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_1M_19_x27y477_NH_Coastal_2019_B19.tif",
   "data/cache/usa/nh/USGS_1M_19_x27y478_NH_Coastal_2019_B19.tif"
  ],
  "calculated_at": "2026-09-22T00:07:00+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/valley-260921/us/batch-usa-nh-chunk000.pbf",
  "osm_snapshot": "",
  "run_id": "remeasure-valley-260921-us",
  "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_Coastal_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
   "x27y477",
   "x27y478"
  ],
  "route_base_cut_m": 761.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Coastal_2_2019",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.997,
   "cell_ground_m": 1.0,
   "nodes_failed": 0,
   "window_coverage": {
    "5": 1.0,
    "10": 1.0,
    "20": 1.0,
    "25": 1.0
   }
  },
  "structure_own_ways": "none \u2014 the route carried no way list and no mapped way runs along it; own decks unmasked",
  "prior_doc": {
   "slug": "old-francestown-road",
   "calculated_at": "2026-09-05T00:05:44+00:00",
   "code_git_sha": null,
   "analysis_version": "0.1.0",
   "run_id": "hunt-wave2-260905",
   "path": "/root/uk-climbs/output/valley-260921/us/priors/old-francestown-road/old-francestown-road.json",
   "spans": 4,
   "sources": [
    "excluded_ranges_m"
   ]
  },
  "carriageway": {
   "stations": 54,
   "stations_resolved": 54,
   "width_median_m": 5.5,
   "width_p10_m": 3.4,
   "width_min_m": 2.25,
   "width_max_m": 10.75,
   "bounded_share": 0.111,
   "unbounded_share": 0.889,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.75,
   "window_m": [
    82.0,
    107.0
   ],
   "width_at_max25_m": 4.75,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "status": "unavailable \u2014 no DSM raster (surface model absent or point-cloud only, which cannot serve off-line samples)"
   }
  },
  "remeasured": {
   "on": "2026-09-22",
   "why": "valley-crossing extent re-measure 2026-09-22: low-to-summit (761.0 m -> 1948.0 m)",
   "published_max25_pct": 24.17,
   "max25_pct": 24.17
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Deering",
  "county": "New Hampshire"
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    690.0,
    858.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}