{
 "ocl_version": "0.1.0",
 "name": "Chemin des \u00c9coles",
 "slug": "chemin-des-ecoles",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.888331827552122,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 396.0,
   "end_distance_m": 398.0,
   "start_elevation_m": 43.921493435703766,
   "end_elevation_m": 44.37926007225481,
   "min_gradient_pct": -10.192599687317028
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.20268267921952,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 412.0,
   "end_distance_m": 415.0,
   "start_elevation_m": 47.21258397093607,
   "end_elevation_m": 47.87866445131266,
   "min_gradient_pct": -8.442007387672845
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.649816998177727,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 395.0,
   "end_distance_m": 400.0,
   "start_elevation_m": 43.71497764516451,
   "end_elevation_m": 44.797468495073396,
   "min_gradient_pct": -7.11966594116916
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.0389768850132,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 406.0,
   "end_distance_m": 416.0,
   "start_elevation_m": 45.986637571380584,
   "end_elevation_m": 48.090535259881904,
   "min_gradient_pct": -5.918080467348901
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.845209120890686,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 396.0,
   "end_distance_m": 416.0,
   "start_elevation_m": 43.921493435703766,
   "end_elevation_m": 48.090535259881904,
   "min_gradient_pct": -4.3410885173399905
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.633702416476634,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 391.0,
   "end_distance_m": 416.0,
   "start_elevation_m": 42.932109655762744,
   "end_elevation_m": 48.090535259881904,
   "min_gradient_pct": -3.8393045971316155
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.366831794048096,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 367.0,
   "end_distance_m": 417.0,
   "start_elevation_m": 38.562112982234936,
   "end_elevation_m": 48.245528879258984,
   "min_gradient_pct": -2.209583648071046
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.01839937603644,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 325.0,
   "end_distance_m": 425.0,
   "start_elevation_m": 32.48196477625605,
   "end_elevation_m": 49.50036415229249,
   "min_gradient_pct": -0.8776501748465151
  }
 ],
 "shape": {
  "ascent_concentration": 0.603,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 148.0,
  "shape_class": "stepped"
 },
 "length_m": 595.4676847165537,
 "start_elevation_m": 16.451463933711445,
 "end_elevation_m": 50.30234913467464,
 "endpoint_gain_m": 33.8508852009632,
 "overall_gradient_pct": 5.684756044667047,
 "accumulated_ascent_m": 37.29990646211461,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.649816998177727,
   "start_distance_m": 395.0,
   "end_distance_m": 400.0,
   "midpoint_distance_m": 397.5,
   "start_elevation_m": 43.71497764516451,
   "end_elevation_m": 44.797468495073396,
   "start_xy": [
    518553.12325672957,
    6919224.687620182
   ],
   "end_xy": [
    518552.5311225873,
    6919219.731263909
   ]
  },
  "max_10m": {
   "gradient_pct": 21.0389768850132,
   "start_distance_m": 406.0,
   "end_distance_m": 416.0,
   "midpoint_distance_m": 411.0,
   "start_elevation_m": 45.986637571380584,
   "end_elevation_m": 48.090535259881904,
   "start_xy": [
    518552.1233447424,
    6919213.745136844
   ],
   "end_xy": [
    518551.53588578687,
    6919203.778945093
   ]
  },
  "max_20m": {
   "gradient_pct": 20.845209120890686,
   "start_distance_m": 396.0,
   "end_distance_m": 416.0,
   "midpoint_distance_m": 406.0,
   "start_elevation_m": 43.921493435703766,
   "end_elevation_m": 48.090535259881904,
   "start_xy": [
    518552.9393774192,
    6919223.704671353
   ],
   "end_xy": [
    518551.53588578687,
    6919203.778945093
   ]
  },
  "max_25m": {
   "gradient_pct": 20.633702416476634,
   "start_distance_m": 391.0,
   "end_distance_m": 416.0,
   "midpoint_distance_m": 403.5,
   "start_elevation_m": 42.932109655762744,
   "end_elevation_m": 48.090535259881904,
   "start_xy": [
    518553.85877397103,
    6919228.619415495
   ],
   "end_xy": [
    518551.53588578687,
    6919203.778945093
   ]
  },
  "max_50m": {
   "gradient_pct": 19.366831794048096,
   "start_distance_m": 367.0,
   "end_distance_m": 417.0,
   "midpoint_distance_m": 392.0,
   "start_elevation_m": 38.562112982234936,
   "end_elevation_m": 48.245528879258984,
   "start_xy": [
    518557.55015272443,
    6919252.320539534
   ],
   "end_xy": [
    518551.8303295847,
    6919202.823276296
   ]
  },
  "max_100m": {
   "gradient_pct": 17.01839937603644,
   "start_distance_m": 325.0,
   "end_distance_m": 425.0,
   "midpoint_distance_m": 375.0,
   "start_elevation_m": 32.48196477625605,
   "end_elevation_m": 49.50036415229249,
   "start_xy": [
    518558.9247851068,
    6919294.20283391
   ],
   "end_xy": [
    518554.1858799675,
    6919195.177925918
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.11966594116916,
   "start_distance_m": 560.0,
   "end_distance_m": 565.0,
   "midpoint_distance_m": 562.5,
   "start_elevation_m": 51.23093611064841,
   "end_elevation_m": 50.87495281358995,
   "start_xy": [
    518674.81718002213,
    6919139.795478596
   ],
   "end_xy": [
    518679.6628332206,
    6919138.562739743
   ]
  },
  "min_10m": {
   "gradient_pct": -5.918080467348901,
   "start_distance_m": 554.0,
   "end_distance_m": 564.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 51.513635349684925,
   "end_elevation_m": 50.921827302950035,
   "start_xy": [
    518669.02910784347,
    6919141.350112402
   ],
   "end_xy": [
    518678.69370258093,
    6919138.809287514
   ]
  },
  "min_20m": {
   "gradient_pct": -4.3410885173399905,
   "start_distance_m": 553.0,
   "end_distance_m": 573.0,
   "midpoint_distance_m": 563.0,
   "start_elevation_m": 51.56974622956587,
   "end_elevation_m": 50.701528526097874,
   "start_xy": [
    518668.1210887581,
    6919141.769041203
   ],
   "end_xy": [
    518687.4158783382,
    6919136.590357578
   ]
  },
  "min_25m": {
   "gradient_pct": -3.8393045971316155,
   "start_distance_m": 553.0,
   "end_distance_m": 578.0,
   "midpoint_distance_m": 565.5,
   "start_elevation_m": 51.56974622956587,
   "end_elevation_m": 50.60992008028297,
   "start_xy": [
    518668.1210887581,
    6919141.769041203
   ],
   "end_xy": [
    518692.26153153664,
    6919135.357618725
   ]
  },
  "min_50m": {
   "gradient_pct": -2.209583648071046,
   "start_distance_m": 545.0,
   "end_distance_m": 595.0,
   "midpoint_distance_m": 570.0,
   "start_elevation_m": 51.417066013893205,
   "end_elevation_m": 50.31227418985768,
   "start_xy": [
    518660.8569360754,
    6919145.120471614
   ],
   "end_xy": [
    518708.73675241147,
    6919131.166306624
   ]
  },
  "min_100m": {
   "gradient_pct": -0.8776501748465151,
   "start_distance_m": 470.0,
   "end_distance_m": 570.0,
   "midpoint_distance_m": 520.0,
   "start_elevation_m": 51.62075475732611,
   "end_elevation_m": 50.743104582479596,
   "start_xy": [
    518592.2071316116,
    6919174.955287377
   ],
   "end_xy": [
    518684.5084864191,
    6919137.33000089
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.888331827552122,
   "start_distance_m": 396.0,
   "end_distance_m": 398.0,
   "midpoint_distance_m": 397.0,
   "start_elevation_m": 43.921493435703766,
   "end_elevation_m": 44.37926007225481,
   "start_xy": [
    518552.9393774192,
    6919223.704671353
   ],
   "end_xy": [
    518552.6670485356,
    6919221.726639597
   ]
  },
  "max_3m": {
   "gradient_pct": 22.20268267921952,
   "start_distance_m": 412.0,
   "end_distance_m": 415.0,
   "midpoint_distance_m": 413.5,
   "start_elevation_m": 47.21258397093607,
   "end_elevation_m": 47.87866445131266,
   "start_xy": [
    518551.7155668975,
    6919207.75900978
   ],
   "end_xy": [
    518551.511677975,
    6919204.765946248
   ]
  }
 },
 "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": 0.209,
   "obstruction_max_height_m": 23.99,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "11607044e533e467c5c753c7fffd2d09371a473e",
   "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-no6",
   "road_pbf": "block-batch-fr-no6.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": "sha256:396cc16291f947a7"
  },
  "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_E518-N6919_0m5@24LHDHD2-2025-09-26.tif"
  ],
  "calculated_at": "2026-09-26T00:59:05+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-no6.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-no6",
  "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": [
   "E518-N6919"
  ],
  "elevation_blocks": [
   "24LHDHD2@2025-09-26"
  ],
  "ign_dalles": [
   "LHD_FXX_0518_6920_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "24LHDHD2"
  ],
  "ign_editions": [
   "2025-09-26"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0518_6920_MNT_O_0M50_LAMB93_IGN69": "2025-09-26"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 30,
   "stations_resolved": 30,
   "width_median_m": 4.38,
   "width_p10_m": 2.75,
   "width_min_m": 2.25,
   "width_max_m": 11.25,
   "bounded_share": 0.2,
   "unbounded_share": 0.8,
   "confidence_median": 0.0,
   "width_median_bounded_m": 3.38,
   "window_m": [
    391.0,
    416.0
   ],
   "width_at_max25_m": 3.75,
   "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": 30,
    "stations_resolved": 30,
    "width_median_m": 5.75,
    "width_p10_m": 0.98,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.633,
    "unbounded_share": 0.367,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.5,
    "window_m": [
     391.0,
     416.0
    ],
    "width_at_max25_m": 5.0,
    "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": "Pont-Audemer",
  "county": "Eure",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}