{
 "ocl_version": "0.1.0",
 "name": "Chemin des Farnettes",
 "slug": "chemin-des-farnettes",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.438479863898465,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 73.0,
   "end_distance_m": 75.0,
   "start_elevation_m": 494.2496603708119,
   "end_elevation_m": 494.7184299680899,
   "min_gradient_pct": -10.688612929183705
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.179054819671745,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 73.0,
   "end_distance_m": 76.0,
   "start_elevation_m": 494.2496603708119,
   "end_elevation_m": 494.91503201540206,
   "min_gradient_pct": -10.078804898957591
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.983737133529075,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 70.0,
   "end_distance_m": 75.0,
   "start_elevation_m": 493.6192431114134,
   "end_elevation_m": 494.7184299680899,
   "min_gradient_pct": -8.913473913438565
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.608270785059744,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "start_elevation_m": 492.98744902777463,
   "end_elevation_m": 495.1482761062806,
   "min_gradient_pct": -7.634678701332973
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.065138349111407,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 61.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 491.75856464512265,
   "end_elevation_m": 495.9715923149449,
   "min_gradient_pct": -5.436157052593558
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.895899100569295,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 58.0,
   "end_distance_m": 83.0,
   "start_elevation_m": 491.13830149334444,
   "end_elevation_m": 496.36227626848677,
   "min_gradient_pct": -4.5498617644955175
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.53872994317794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 31.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 486.20222734335596,
   "end_elevation_m": 495.9715923149449,
   "min_gradient_pct": -2.0486472853698388
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.531310266190644,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 481.3879130497296,
   "end_elevation_m": 499.91922331592025,
   "min_gradient_pct": -0.5400872468744069
  }
 ],
 "shape": {
  "ascent_concentration": 0.595,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "stepped"
 },
 "length_m": 670.4925575087153,
 "start_elevation_m": 481.3184630512709,
 "end_elevation_m": 517.168955615226,
 "endpoint_gain_m": 35.85049256395507,
 "overall_gradient_pct": 5.346888964310252,
 "accumulated_ascent_m": 39.189750402734376,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.983737133529075,
   "start_distance_m": 70.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 493.6192431114134,
   "end_elevation_m": 494.7184299680899,
   "start_xy": [
    704475.4358295479,
    6520225.812084424
   ],
   "end_xy": [
    704470.504843692,
    6520226.639960313
   ]
  },
  "max_10m": {
   "gradient_pct": 21.608270785059744,
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "midpoint_distance_m": 72.0,
   "start_elevation_m": 492.98744902777463,
   "end_elevation_m": 495.1482761062806,
   "start_xy": [
    704478.3944210615,
    6520225.31535889
   ],
   "end_xy": [
    704468.5324493496,
    6520226.97111067
   ]
  },
  "max_20m": {
   "gradient_pct": 21.065138349111407,
   "start_distance_m": 61.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 71.0,
   "start_elevation_m": 491.75856464512265,
   "end_elevation_m": 495.9715923149449,
   "start_xy": [
    704484.3305347891,
    6520224.549999661
   ],
   "end_xy": [
    704464.6347071739,
    6520227.8663030155
   ]
  },
  "max_25m": {
   "gradient_pct": 20.895899100569295,
   "start_distance_m": 58.0,
   "end_distance_m": 83.0,
   "midpoint_distance_m": 70.5,
   "start_elevation_m": 491.13830149334444,
   "end_elevation_m": 496.36227626848677,
   "start_xy": [
    704487.3305339923,
    6520224.552186249
   ],
   "end_xy": [
    704462.6884348486,
    6520228.326763692
   ]
  },
  "max_50m": {
   "gradient_pct": 19.53872994317794,
   "start_distance_m": 31.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 56.0,
   "start_elevation_m": 486.20222734335596,
   "end_elevation_m": 495.9715923149449,
   "start_xy": [
    704513.6790773218,
    6520229.841523072
   ],
   "end_xy": [
    704464.6347071739,
    6520227.8663030155
   ]
  },
  "max_100m": {
   "gradient_pct": 18.531310266190644,
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 57.0,
   "start_elevation_m": 481.3879130497296,
   "end_elevation_m": 499.91922331592025,
   "start_xy": [
    704536.9608091092,
    6520235.66912678
   ],
   "end_xy": [
    704450.3260083732,
    6520247.146956405
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.913473913438565,
   "start_distance_m": 484.0,
   "end_distance_m": 489.0,
   "midpoint_distance_m": 486.5,
   "start_elevation_m": 509.7945948138968,
   "end_elevation_m": 509.3489211182249,
   "start_xy": [
    704300.3040488616,
    6520574.713645096
   ],
   "end_xy": [
    704298.8218185856,
    6520579.488893091
   ]
  },
  "min_10m": {
   "gradient_pct": -7.634678701332973,
   "start_distance_m": 484.0,
   "end_distance_m": 494.0,
   "midpoint_distance_m": 489.0,
   "start_elevation_m": 509.7945948138968,
   "end_elevation_m": 509.0311269437635,
   "start_xy": [
    704300.3040488616,
    6520574.713645096
   ],
   "end_xy": [
    704297.5938950537,
    6520584.328456987
   ]
  },
  "min_20m": {
   "gradient_pct": -5.436157052593558,
   "start_distance_m": 484.0,
   "end_distance_m": 504.0,
   "midpoint_distance_m": 494.0,
   "start_elevation_m": 509.7945948138968,
   "end_elevation_m": 508.7073634033781,
   "start_xy": [
    704300.3040488616,
    6520574.713645096
   ],
   "end_xy": [
    704295.661567915,
    6520594.1399865225
   ]
  },
  "min_25m": {
   "gradient_pct": -4.5498617644955175,
   "start_distance_m": 483.0,
   "end_distance_m": 508.0,
   "midpoint_distance_m": 495.5,
   "start_elevation_m": 509.8120832145856,
   "end_elevation_m": 508.6746177734617,
   "start_xy": [
    704300.6004949168,
    6520573.758595497
   ],
   "end_xy": [
    704294.8886370595,
    6520598.064598337
   ]
  },
  "min_50m": {
   "gradient_pct": -2.0486472853698388,
   "start_distance_m": 460.0,
   "end_distance_m": 510.0,
   "midpoint_distance_m": 485.0,
   "start_elevation_m": 509.6994863127363,
   "end_elevation_m": 508.6751626700514,
   "start_xy": [
    704307.4187541865,
    6520551.792454722
   ],
   "end_xy": [
    704294.5021716318,
    6520600.026904244
   ]
  },
  "min_100m": {
   "gradient_pct": -0.5400872468744069,
   "start_distance_m": 456.0,
   "end_distance_m": 556.0,
   "midpoint_distance_m": 506.0,
   "start_elevation_m": 509.6375779275071,
   "end_elevation_m": 509.0974906806327,
   "start_xy": [
    704308.6045384073,
    6520547.972256327
   ],
   "end_xy": [
    704285.3855771251,
    6520645.112813628
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.438479863898465,
   "start_distance_m": 73.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 74.0,
   "start_elevation_m": 494.2496603708119,
   "end_elevation_m": 494.7184299680899,
   "start_xy": [
    704472.4772380344,
    6520226.3088099575
   ],
   "end_xy": [
    704470.504843692,
    6520226.639960313
   ]
  },
  "max_3m": {
   "gradient_pct": 22.179054819671745,
   "start_distance_m": 73.0,
   "end_distance_m": 76.0,
   "midpoint_distance_m": 74.5,
   "start_elevation_m": 494.2496603708119,
   "end_elevation_m": 494.91503201540206,
   "start_xy": [
    704472.4772380344,
    6520226.3088099575
   ],
   "end_xy": [
    704469.5186465208,
    6520226.805535492
   ]
  }
 },
 "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": 0.03,
   "obstruction_max_height_m": 9.69,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "1cc9fdcd6556a02163cb21acb2293cad3067d2a1",
   "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": "fr-mc4",
   "road_pbf": "block-batch-fr-mc4.osm.pbf",
   "region_key": "france",
   "crs": "EPSG:2154",
   "elevation_provider_key": "ign-lidarhd",
   "tile_index": "wms-grid",
   "authority": "bdtopo",
   "registry_pbf": "france-vosges-2026-09-16.osm.pbf",
   "tile_index_snapshot": "sha256:af4eae1f5df9e232"
  },
  "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:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E704-N6520_0m5@22LHD4LL-2025-07-24.tif"
  ],
  "calculated_at": "2026-09-22T17:46:46+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-mc4.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-mc4",
  "elevation_provider": "IGN LiDAR HD MNT 0.5 m",
  "elevation_licence": "Licence Ouverte / Open Licence 2.0 (Etalab) \u2014 \u00a9 IGN, LiDAR HD (MNT/MNS), data.geopf.fr; reproduction autoris\u00e9e avec mention de la source et de la date",
  "elevation_dataset": "LiDAR HD \u2014 MNT (sol) et MNS (surface), 0,50 m (Institut national de l'information g\u00e9ographique et foresti\u00e8re), RGF93 / Lambert-93 EPSG:2154, altitudes IGN69",
  "elevation_vertical_datum": "IGN69",
  "elevation_tile_ids": [
   "E704-N6520"
  ],
  "elevation_blocks": [
   "22LHD4LL@2025-07-24"
  ],
  "ign_dalles": [
   "LHD_FXX_0704_6521_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "22LHD4LL"
  ],
  "ign_editions": [
   "2025-07-24"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0704_6521_MNT_O_0M50_LAMB93_IGN69": "2025-07-24"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 1,
  "carriageway": {
   "stations": 33,
   "stations_resolved": 33,
   "width_median_m": 6.5,
   "width_p10_m": 2.75,
   "width_min_m": 1.25,
   "width_max_m": 12.0,
   "bounded_share": 0.455,
   "unbounded_share": 0.545,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.25,
   "window_m": [
    58.0,
    83.0
   ],
   "width_at_max25_m": 6.75,
   "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": {
    "stations": 33,
    "stations_resolved": 33,
    "width_median_m": 5.0,
    "width_p10_m": 3.35,
    "width_min_m": 1.75,
    "width_max_m": 12.0,
    "bounded_share": 0.879,
    "unbounded_share": 0.121,
    "confidence_median": 1.0,
    "width_median_bounded_m": 5.0,
    "window_m": [
     58.0,
     83.0
    ],
    "width_at_max25_m": 5.25,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Chamali\u00e8res",
  "county": "Puy-de-D\u00f4me",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}