{ "ocl_version": "0.1.0", "name": "Impasse de Pierrefeu", "slug": "impasse-de-pierrefeu", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 32.2210903089001, "diagnostic": true, "flags": [ "structure_excluded", "texture_excluded", "texture_excluded", "canopy_or_structure" ], "start_distance_m": 667.0, "end_distance_m": 669.0, "start_elevation_m": 259.1303000748109, "end_elevation_m": 259.7747218809889, "min_gradient_pct": -13.090155184033847, "suppressed_max_gradient_pct": 56.04170790853402, "suppressed_location_m": [ 618.0, 620.0 ] }, { "window_m": 3.0, "max_gradient_pct": 31.309404981078615, "diagnostic": true, "flags": [ "texture_excluded", "texture_excluded", "canopy_or_structure" ], "start_distance_m": 666.0, "end_distance_m": 669.0, "start_elevation_m": 258.83543973155656, "end_elevation_m": 259.7747218809889, "min_gradient_pct": -7.205649764333089, "suppressed_max_gradient_pct": 51.19741959086639, "suppressed_location_m": [ 381.0, 384.0 ] }, { "window_m": 5.0, "max_gradient_pct": 28.226448265161252, "diagnostic": false, "flags": [ "texture_excluded", "texture_excluded" ], "start_distance_m": 749.0, "end_distance_m": 754.0, "start_elevation_m": 273.406001954028, "end_elevation_m": 274.81732436728606, "min_gradient_pct": -3.1636116785625745, "suppressed_max_gradient_pct": 39.142475354359476, "suppressed_location_m": [ 380.0, 385.0 ] }, { "window_m": 10.0, "max_gradient_pct": 27.08600309646613, "diagnostic": false, "flags": [], "start_distance_m": 745.0, "end_distance_m": 755.0, "start_elevation_m": 272.3659231337858, "end_elevation_m": 275.07452344343244, "min_gradient_pct": -2.1797057659074426 }, { "window_m": 20.0, "max_gradient_pct": 25.672159229281135, "diagnostic": false, "flags": [], "start_distance_m": 741.0, "end_distance_m": 761.0, "start_elevation_m": 271.3908395580319, "end_elevation_m": 276.52527140388815, "min_gradient_pct": -1.804638113407293 }, { "window_m": 25.0, "max_gradient_pct": 25.16930147929952, "diagnostic": false, "flags": [], "start_distance_m": 736.0, "end_distance_m": 761.0, "start_elevation_m": 270.2329460340633, "end_elevation_m": 276.52527140388815, "min_gradient_pct": -1.3423926244524864 }, { "window_m": 50.0, "max_gradient_pct": 23.266068547885084, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 727.0, "end_distance_m": 777.0, "start_elevation_m": 268.25617852093336, "end_elevation_m": 279.8892127948759, "min_gradient_pct": -0.553389794357372 }, { "window_m": 100.0, "max_gradient_pct": 20.487112814360785, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 696.0, "end_distance_m": 796.0, "start_elevation_m": 262.88070148901454, "end_elevation_m": 283.3678143033753, "min_gradient_pct": 1.2789044351465577 } ], "shape": { "ascent_concentration": 0.378, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 137.0, "shape_class": "sustained" }, "length_m": 1267.7154618470206, "start_elevation_m": 185.26806155272484, "end_elevation_m": 314.786649958488, "endpoint_gain_m": 129.51858840576315, "overall_gradient_pct": 10.216692333866366, "accumulated_ascent_m": 132.02872301577892, "window_maxima": { "max_5m": { "gradient_pct": 28.226448265161252, "start_distance_m": 749.0, "end_distance_m": 754.0, "midpoint_distance_m": 751.5, "start_elevation_m": 273.406001954028, "end_elevation_m": 274.81732436728606, "start_xy": [ 859981.252570313, 6406021.547311165 ], "end_xy": [ 859986.2372168701, 6406021.938844945 ] }, "max_10m": { "gradient_pct": 27.08600309646613, "start_distance_m": 745.0, "end_distance_m": 755.0, "midpoint_distance_m": 750.0, "start_elevation_m": 272.3659231337858, "end_elevation_m": 275.07452344343244, "start_xy": [ 859977.2648530673, 6406021.234084141 ], "end_xy": [ 859987.2341461815, 6406022.017151701 ] }, "max_20m": { "gradient_pct": 25.672159229281135, "start_distance_m": 741.0, "end_distance_m": 761.0, "midpoint_distance_m": 751.0, "start_elevation_m": 271.3908395580319, "end_elevation_m": 276.52527140388815, "start_xy": [ 859973.2771358216, 6406020.9208571175 ], "end_xy": [ 859993.2208637517, 6406022.397750323 ] }, "max_25m": { "gradient_pct": 25.16930147929952, "start_distance_m": 736.0, "end_distance_m": 761.0, "midpoint_distance_m": 748.5, "start_elevation_m": 270.2329460340633, "end_elevation_m": 276.52527140388815, "start_xy": [ 859968.2924892645, 6406020.529323338 ], "end_xy": [ 859993.2208637517, 6406022.397750323 ] }, "max_50m": { "gradient_pct": 23.266068547885084, "start_distance_m": 727.0, "end_distance_m": 777.0, "midpoint_distance_m": 752.0, "start_elevation_m": 268.25617852093336, "end_elevation_m": 279.8892127948759, "start_xy": [ 859959.3660102702, 6406019.442205608 ], "end_xy": [ 860009.2100802184, 6406022.985080538 ] }, "max_100m": { "gradient_pct": 20.487112814360785, "start_distance_m": 696.0, "end_distance_m": 796.0, "midpoint_distance_m": 746.0, "start_elevation_m": 262.88070148901454, "end_elevation_m": 283.3678143033753, "start_xy": [ 859929.3087523363, 6406012.265284758 ], "end_xy": [ 860028.1890545049, 6406022.604191682 ] } }, "window_minima": { "min_5m": { "gradient_pct": -3.1636116785625745, "start_distance_m": 613.0, "end_distance_m": 618.0, "midpoint_distance_m": 615.5, "start_elevation_m": 248.8642690857236, "end_elevation_m": 248.70608850179548, "start_xy": [ 859852.4847599904, 6406010.951698859 ], "end_xy": [ 859855.0175522849, 6406014.148684962 ] }, "min_10m": { "gradient_pct": -2.1797057659074426, "start_distance_m": 960.0, "end_distance_m": 970.0, "midpoint_distance_m": 965.0, "start_elevation_m": 293.4658967743446, "end_elevation_m": 293.2479261977539, "start_xy": [ 860190.3427641448, 6406001.309281857 ], "end_xy": [ 860200.0391412722, 6405998.863822676 ] }, "min_20m": { "gradient_pct": -1.804638113407293, "start_distance_m": 956.0, "end_distance_m": 976.0, "midpoint_distance_m": 966.0, "start_elevation_m": 293.5219577616537, "end_elevation_m": 293.16103013897225, "start_xy": [ 860186.4642132939, 6406002.287465529 ], "end_xy": [ 860205.8016006132, 6405997.239079684 ] }, "min_25m": { "gradient_pct": -1.3423926244524864, "start_distance_m": 951.0, "end_distance_m": 976.0, "midpoint_distance_m": 963.5, "start_elevation_m": 293.4966282950854, "end_elevation_m": 293.16103013897225, "start_xy": [ 860181.6160247301, 6406003.510195118 ], "end_xy": [ 860205.8016006132, 6405997.239079684 ] }, "min_50m": { "gradient_pct": -0.553389794357372, "start_distance_m": 940.0, "end_distance_m": 990.0, "midpoint_distance_m": 965.0, "start_elevation_m": 293.5007255576721, "end_elevation_m": 293.22403066049344, "start_xy": [ 860170.95000989, 6406006.200200217 ], "end_xy": [ 860218.0514824367, 6405990.624976207 ] }, "min_100m": { "gradient_pct": 1.2789044351465577, "start_distance_m": 900.0, "end_distance_m": 1000.0, "midpoint_distance_m": 950.0, "start_elevation_m": 292.1868112076436, "end_elevation_m": 293.46571564279014, "start_xy": [ 860131.8467629433, 6406014.607686514 ], "end_xy": [ 860223.9173388247, 6405982.764539306 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 32.2210903089001, "start_distance_m": 667.0, "end_distance_m": 669.0, "midpoint_distance_m": 668.0, "start_elevation_m": 259.1303000748109, "end_elevation_m": 259.7747218809889, "start_xy": [ 859901.9092449633, 6406003.014744902 ], "end_xy": [ 859903.7723038024, 6406003.74207685 ] }, "max_3m": { "gradient_pct": 31.309404981078615, "start_distance_m": 666.0, "end_distance_m": 669.0, "midpoint_distance_m": 667.5, "start_elevation_m": 258.83543973155656, "end_elevation_m": 259.7747218809889, "start_xy": [ 859900.9521565579, 6406002.806600438 ], "end_xy": [ 859903.7723038024, 6406003.74207685 ] } }, "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": 0.005, "windows_resited": [ 2.0 ], "windows_unresolved": [] }, "no_bench_suppression": { "masked_fraction": 0.037, "windows_resited": [], "windows_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.053, "windows_resited": [ 2.0, 3.0, 5.0 ], "windows_unresolved": [] }, "texture_windows": { "rounds": 2, "windows_masked": [ { "window_m": 5.0, "start_m": 380.0, "end_m": 385.0, "raw_pct": 39.14, "reason": "short-step" }, { "window_m": 5.0, "start_m": 406.0, "end_m": 411.0, "raw_pct": 33.87, "reason": "short-step" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.255, "obstruction_max_height_m": 15.86, "flagged_windows_m": [ 2, 3, 50, 100 ] }, "excluded_ranges_m": [ [ 378.0, 387.0 ], [ 404.0, 413.0 ], [ 420.0, 460.0 ], [ 617.0, 622.0 ] ], "review": [], "extent": [ "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:2154", "elevation_resolution_m": 0.5, "elevation_tiles": [ "data/cache/fr/ign-lidarhd_dtm_E859-N6405_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E859-N6406_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E860-N6405_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E860-N6406_0m5.tif" ], "calculated_at": "2026-09-17T04:08:27+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps1.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps1", "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": [ "E859-N6405", "E859-N6406", "E860-N6405", "E860-N6406" ], "elevation_blocks": [ "22LHD5ON@2025-08-13" ], "ign_dalles": [ "LHD_FXX_0859_6406_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0859_6407_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0860_6406_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0860_6407_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD5ON" ], "ign_editions": [ "2025-08-13" ], "ign_dsm_edition": { "LHD_FXX_0859_6406_MNT_O_0M50_LAMB93_IGN69": "2025-08-13", "LHD_FXX_0859_6407_MNT_O_0M50_LAMB93_IGN69": "2025-08-13", "LHD_FXX_0860_6406_MNT_O_0M50_LAMB93_IGN69": "2025-08-13", "LHD_FXX_0860_6407_MNT_O_0M50_LAMB93_IGN69": "2025-08-13" }, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 57, "stations_resolved": 57, "width_median_m": 5.75, "width_p10_m": 2.5, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.281, "unbounded_share": 0.719, "confidence_median": 0.0, "width_median_bounded_m": 4.5, "window_m": [ 736.0, 761.0 ], "width_at_max25_m": 4.0, "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": 57, "stations_resolved": 57, "width_median_m": 4.75, "width_p10_m": 0.8, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.807, "unbounded_share": 0.193, "confidence_median": 1.0, "width_median_bounded_m": 3.75, "window_m": [ 736.0, 761.0 ], "width_at_max25_m": 5.75, "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": "Crest", "county": "Dr\u00f4me", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }