{
 "ocl_version": "0.1.0",
 "name": "15",
 "slug": "15",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.650153125858196,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1428.0,
   "end_distance_m": 1430.0,
   "start_elevation_m": 2770.6069699127365,
   "end_elevation_m": 2771.2999729752537,
   "min_gradient_pct": -13.897777991132898
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 34.29977879492677,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1427.0,
   "end_distance_m": 1430.0,
   "start_elevation_m": 2770.270979611406,
   "end_elevation_m": 2771.2999729752537,
   "min_gradient_pct": -12.928094701267886
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.69992707614074,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1425.0,
   "end_distance_m": 1430.0,
   "start_elevation_m": 2769.6149766214467,
   "end_elevation_m": 2771.2999729752537,
   "min_gradient_pct": -12.548298163828804
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.81093623012566,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1424.0,
   "end_distance_m": 1434.0,
   "start_elevation_m": 2769.305519103919,
   "end_elevation_m": 2772.5866127269314,
   "min_gradient_pct": -11.811921912676553
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 31.551864816522084,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1425.0,
   "end_distance_m": 1445.0,
   "start_elevation_m": 2769.6149766214467,
   "end_elevation_m": 2775.925349584751,
   "min_gradient_pct": -11.261475973942652
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 31.464053785410215,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1424.0,
   "end_distance_m": 1449.0,
   "start_elevation_m": 2769.305519103919,
   "end_elevation_m": 2777.1715325502714,
   "min_gradient_pct": -11.202668804085988
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 30.871429348055244,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1403.0,
   "end_distance_m": 1453.0,
   "start_elevation_m": 2762.985143092689,
   "end_elevation_m": 2778.420857766717,
   "min_gradient_pct": -9.983929149451797
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 29.728890298312308,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1387.0,
   "end_distance_m": 1487.0,
   "start_elevation_m": 2758.3870246298447,
   "end_elevation_m": 2788.115914928157,
   "min_gradient_pct": -5.368789873827154
  }
 ],
 "shape": {
  "ascent_concentration": 0.4,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 255.0,
  "shape_class": "sustained"
 },
 "length_m": 1948.37485424842,
 "start_elevation_m": 2637.0650723632734,
 "end_elevation_m": 2848.3122726953125,
 "endpoint_gain_m": 211.24720033203903,
 "overall_gradient_pct": 10.842225759145666,
 "accumulated_ascent_m": 220.8541565521332,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.69992707614074,
   "start_distance_m": 1425.0,
   "end_distance_m": 1430.0,
   "midpoint_distance_m": 1427.5,
   "start_elevation_m": 2769.6149766214467,
   "end_elevation_m": 2771.2999729752537,
   "start_xy": [
    2820045.492301828,
    1205711.0937739266
   ],
   "end_xy": [
    2820046.5642005084,
    1205715.9654043824
   ]
  },
  "max_10m": {
   "gradient_pct": 32.81093623012566,
   "start_distance_m": 1424.0,
   "end_distance_m": 1434.0,
   "midpoint_distance_m": 1429.0,
   "start_elevation_m": 2769.305519103919,
   "end_elevation_m": 2772.5866127269314,
   "start_xy": [
    2820045.1649481766,
    1205710.148872034
   ],
   "end_xy": [
    2820047.264886051,
    1205719.9035562042
   ]
  },
  "max_20m": {
   "gradient_pct": 31.551864816522084,
   "start_distance_m": 1425.0,
   "end_distance_m": 1445.0,
   "midpoint_distance_m": 1435.0,
   "start_elevation_m": 2769.6149766214467,
   "end_elevation_m": 2775.925349584751,
   "start_xy": [
    2820045.492301828,
    1205711.0937739266
   ],
   "end_xy": [
    2820049.1917712926,
    1205730.7334737137
   ]
  },
  "max_25m": {
   "gradient_pct": 31.464053785410215,
   "start_distance_m": 1424.0,
   "end_distance_m": 1449.0,
   "midpoint_distance_m": 1436.5,
   "start_elevation_m": 2769.305519103919,
   "end_elevation_m": 2777.1715325502714,
   "start_xy": [
    2820045.1649481766,
    1205710.148872034
   ],
   "end_xy": [
    2820049.892456835,
    1205734.6716255355
   ]
  },
  "max_50m": {
   "gradient_pct": 30.871429348055244,
   "start_distance_m": 1403.0,
   "end_distance_m": 1453.0,
   "midpoint_distance_m": 1428.0,
   "start_elevation_m": 2762.985143092689,
   "end_elevation_m": 2778.420857766717,
   "start_xy": [
    2820038.290521486,
    1205690.3059322902
   ],
   "end_xy": [
    2820050.5931423777,
    1205738.6097773572
   ]
  },
  "max_100m": {
   "gradient_pct": 29.728890298312308,
   "start_distance_m": 1387.0,
   "end_distance_m": 1487.0,
   "midpoint_distance_m": 1437.0,
   "start_elevation_m": 2758.3870246298447,
   "end_elevation_m": 2788.115914928157,
   "start_xy": [
    2820031.936185216,
    1205675.6406357249
   ],
   "end_xy": [
    2820061.3467590683,
    1205770.8220833256
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.548298163828804,
   "start_distance_m": 1258.0,
   "end_distance_m": 1263.0,
   "midpoint_distance_m": 1260.5,
   "start_elevation_m": 2748.5583719863826,
   "end_elevation_m": 2747.930957078191,
   "start_xy": [
    2819976.8293608064,
    1205559.4306123436
   ],
   "end_xy": [
    2819979.4252531407,
    1205563.7039416062
   ]
  },
  "min_10m": {
   "gradient_pct": -11.811921912676553,
   "start_distance_m": 1257.0,
   "end_distance_m": 1267.0,
   "midpoint_distance_m": 1262.0,
   "start_elevation_m": 2748.671039837065,
   "end_elevation_m": 2747.4898476457975,
   "start_xy": [
    2819976.3101823395,
    1205558.575946491
   ],
   "end_xy": [
    2819981.501967008,
    1205567.1226050165
   ]
  },
  "min_20m": {
   "gradient_pct": -11.261475973942652,
   "start_distance_m": 1243.0,
   "end_distance_m": 1263.0,
   "midpoint_distance_m": 1253.0,
   "start_elevation_m": 2750.1832522729796,
   "end_elevation_m": 2747.930957078191,
   "start_xy": [
    2819969.041683803,
    1205546.6106245553
   ],
   "end_xy": [
    2819979.4252531407,
    1205563.7039416062
   ]
  },
  "min_25m": {
   "gradient_pct": -11.202668804085988,
   "start_distance_m": 1243.0,
   "end_distance_m": 1268.0,
   "midpoint_distance_m": 1255.5,
   "start_elevation_m": 2750.1832522729796,
   "end_elevation_m": 2747.382585071958,
   "start_xy": [
    2819969.041683803,
    1205546.6106245553
   ],
   "end_xy": [
    2819982.021145475,
    1205567.977270869
   ]
  },
  "min_50m": {
   "gradient_pct": -9.983929149451797,
   "start_distance_m": 1232.0,
   "end_distance_m": 1282.0,
   "midpoint_distance_m": 1257.0,
   "start_elevation_m": 2751.2118873394443,
   "end_elevation_m": 2746.2199227647184,
   "start_xy": [
    2819963.3307206673,
    1205537.2093001772
   ],
   "end_xy": [
    2819989.2896440113,
    1205579.9425928048
   ]
  },
  "min_100m": {
   "gradient_pct": -5.368789873827154,
   "start_distance_m": 1208.0,
   "end_distance_m": 1308.0,
   "midpoint_distance_m": 1258.0,
   "start_elevation_m": 2751.390451801926,
   "end_elevation_m": 2746.0216619280986,
   "start_xy": [
    2819960.089055992,
    1205513.5329353178
   ],
   "end_xy": [
    2820001.693027623,
    1205602.7062879002
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.650153125858196,
   "start_distance_m": 1428.0,
   "end_distance_m": 1430.0,
   "midpoint_distance_m": 1429.0,
   "start_elevation_m": 2770.6069699127365,
   "end_elevation_m": 2771.2999729752537,
   "start_xy": [
    2820046.2138577374,
    1205713.9963284717
   ],
   "end_xy": [
    2820046.5642005084,
    1205715.9654043824
   ]
  },
  "max_3m": {
   "gradient_pct": 34.29977879492677,
   "start_distance_m": 1427.0,
   "end_distance_m": 1430.0,
   "midpoint_distance_m": 1428.5,
   "start_elevation_m": 2770.270979611406,
   "end_elevation_m": 2771.2999729752537,
   "start_xy": [
    2820046.0386863514,
    1205713.0117905163
   ],
   "end_xy": [
    2820046.5642005084,
    1205715.9654043824
   ]
  }
 },
 "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": [
   "descends_at_start",
   "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:2056",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/ch/swissalti3d_2023_2819-1204_0.5_2056_5728.tif",
   "data/cache/ch/swissalti3d_2023_2819-1205_0.5_2056_5728.tif",
   "data/cache/ch/swissalti3d_2023_2820-1204_0.5_2056_5728.tif",
   "data/cache/ch/swissalti3d_2023_2820-1205_0.5_2056_5728.tif",
   "data/cache/ch/swissalti3d_2023_2820-1206_0.5_2056_5728.tif"
  ],
  "calculated_at": "2026-09-11T03:51:50+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/switzerland-2026-09-10-batch.osm.pbf",
  "osm_snapshot": "",
  "run_id": "ch-run7-260911",
  "elevation_provider": "swisstopo swissALTI3D",
  "elevation_licence": "swisstopo open government data (OGD): free use, attribution '\u00a9 swisstopo' \u2014 https://www.swisstopo.admin.ch/en/terms-and-conditions",
  "elevation_dataset": "swissALTI3D 0.5 m DTM (Federal Office of Topography swisstopo)",
  "elevation_tile_ids": [
   "2819-1204",
   "2819-1205",
   "2820-1204",
   "2820-1205",
   "2820-1206"
  ],
  "climb_origin": "discovered",
  "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"
 },
 "area": {
  "place": "Samnaun",
  "county": "Graub\u00fcnden/Grischun/Grigioni",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    1242.0,
    1421.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}