{ "ocl_version": "0.1.0", "name": "Chemin des Foug\u00e8res", "slug": "chemin-des-fougeres-2", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 35.08841513543928, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 1652.0, "end_distance_m": 1654.0, "start_elevation_m": 480.593349511071, "end_elevation_m": 481.29511781377977, "min_gradient_pct": -24.30673972370414 }, { "window_m": 3.0, "max_gradient_pct": 33.888936446980246, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 1652.0, "end_distance_m": 1655.0, "start_elevation_m": 480.593349511071, "end_elevation_m": 481.6100176044804, "min_gradient_pct": -16.568015972213363 }, { "window_m": 5.0, "max_gradient_pct": 30.234883560568733, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1651.0, "end_distance_m": 1656.0, "start_elevation_m": 480.3306915163455, "end_elevation_m": 481.84243569437393, "min_gradient_pct": -7.384415193944278 }, { "window_m": 10.0, "max_gradient_pct": 24.113962320159885, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1649.0, "end_distance_m": 1659.0, "start_elevation_m": 479.87159826081614, "end_elevation_m": 482.28299449283213, "min_gradient_pct": -6.42513763865054 }, { "window_m": 20.0, "max_gradient_pct": 20.555394086080696, "diagnostic": false, "flags": [], "start_distance_m": 2078.0, "end_distance_m": 2098.0, "start_elevation_m": 530.2580025132953, "end_elevation_m": 534.3690813305114, "min_gradient_pct": -4.359547971591837 }, { "window_m": 25.0, "max_gradient_pct": 20.0972768682891, "diagnostic": false, "flags": [], "start_distance_m": 2074.0, "end_distance_m": 2099.0, "start_elevation_m": 529.5404548793935, "end_elevation_m": 534.5647740964657, "min_gradient_pct": -3.0841170447597506 }, { "window_m": 50.0, "max_gradient_pct": 19.43392440558455, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1607.0, "end_distance_m": 1657.0, "start_elevation_m": 472.3332234388564, "end_elevation_m": 482.0501856416487, "min_gradient_pct": -1.031295879756044 }, { "window_m": 100.0, "max_gradient_pct": 17.816625014966576, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1572.0, "end_distance_m": 1672.0, "start_elevation_m": 466.4414048081653, "end_elevation_m": 484.2580298231319, "min_gradient_pct": 0.7679277034249594 } ], "shape": { "ascent_concentration": 0.418, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 152.0, "shape_class": "sustained" }, "length_m": 2153.767736989176, "start_elevation_m": 374.84178494876033, "end_elevation_m": 537.3267513305566, "endpoint_gain_m": 162.48496638179626, "overall_gradient_pct": 7.544219536361866, "accumulated_ascent_m": 167.49204845636655, "window_maxima": { "max_5m": { "gradient_pct": 30.234883560568733, "start_distance_m": 1651.0, "end_distance_m": 1656.0, "midpoint_distance_m": 1653.5, "start_elevation_m": 480.3306915163455, "end_elevation_m": 481.84243569437393, "start_xy": [ 898290.43988546, 6493568.600269993 ], "end_xy": [ 898295.4106750967, 6493569.13994618 ] }, "max_10m": { "gradient_pct": 24.113962320159885, "start_distance_m": 1649.0, "end_distance_m": 1659.0, "midpoint_distance_m": 1654.0, "start_elevation_m": 479.87159826081614, "end_elevation_m": 482.28299449283213, "start_xy": [ 898288.4515696053, 6493568.384399517 ], "end_xy": [ 898298.3931488787, 6493569.4637518935 ] }, "max_20m": { "gradient_pct": 20.555394086080696, "start_distance_m": 2078.0, "end_distance_m": 2098.0, "midpoint_distance_m": 2088.0, "start_elevation_m": 530.2580025132953, "end_elevation_m": 534.3690813305114, "start_xy": [ 898642.0735562858, 6493500.282001312 ], "end_xy": [ 898651.065855045, 6493482.496698435 ] }, "max_25m": { "gradient_pct": 20.0972768682891, "start_distance_m": 2074.0, "end_distance_m": 2099.0, "midpoint_distance_m": 2086.5, "start_elevation_m": 529.5404548793935, "end_elevation_m": 534.5647740964657, "start_xy": [ 898641.0924458746, 6493504.1598128555 ], "end_xy": [ 898651.7364557504, 6493481.826144019 ] }, "max_50m": { "gradient_pct": 19.43392440558455, "start_distance_m": 1607.0, "end_distance_m": 1657.0, "midpoint_distance_m": 1632.0, "start_elevation_m": 472.3332234388564, "end_elevation_m": 482.0501856416487, "start_xy": [ 898250.0820187054, 6493580.273714797 ], "end_xy": [ 898296.404833024, 6493569.247881418 ] }, "max_100m": { "gradient_pct": 17.816625014966576, "start_distance_m": 1572.0, "end_distance_m": 1672.0, "midpoint_distance_m": 1622.0, "start_elevation_m": 466.4414048081653, "end_elevation_m": 484.2580298231319, "start_xy": [ 898221.4964659158, 6493600.380169916 ], "end_xy": [ 898311.317201934, 6493570.866909982 ] } }, "window_minima": { "min_5m": { "gradient_pct": -7.384415193944278, "start_distance_m": 2141.0, "end_distance_m": 2146.0, "midpoint_distance_m": 2143.5, "start_elevation_m": 537.9406186726138, "end_elevation_m": 537.5713979129166, "start_xy": [ 898687.9962128765, 6493461.100528447 ], "end_xy": [ 898692.0293422918, 6493458.145216768 ] }, "min_10m": { "gradient_pct": -6.42513763865054, "start_distance_m": 2139.0, "end_distance_m": 2149.0, "midpoint_distance_m": 2144.0, "start_elevation_m": 538.0562493617725, "end_elevation_m": 537.4137355979075, "start_xy": [ 898686.3829611103, 6493462.2826531185 ], "end_xy": [ 898694.4492199409, 6493456.372029761 ] }, "min_20m": { "gradient_pct": -4.359547971591837, "start_distance_m": 2133.0, "end_distance_m": 2153.0, "midpoint_distance_m": 2143.0, "start_elevation_m": 538.2146406757545, "end_elevation_m": 537.3427310814361, "start_xy": [ 898681.543205812, 6493465.829027133 ], "end_xy": [ 898697.6757234732, 6493454.007780418 ] }, "min_25m": { "gradient_pct": -3.0841170447597506, "start_distance_m": 2128.0, "end_distance_m": 2153.0, "midpoint_distance_m": 2140.5, "start_elevation_m": 538.113760342626, "end_elevation_m": 537.3427310814361, "start_xy": [ 898677.5100763967, 6493468.784338812 ], "end_xy": [ 898697.6757234732, 6493454.007780418 ] }, "min_50m": { "gradient_pct": -1.031295879756044, "start_distance_m": 1127.0, "end_distance_m": 1177.0, "midpoint_distance_m": 1152.0, "start_elevation_m": 433.6512674920044, "end_elevation_m": 433.1356195521264, "start_xy": [ 897871.5881480876, 6493531.560240204 ], "end_xy": [ 897912.2002475144, 6493560.640253662 ] }, "min_100m": { "gradient_pct": 0.7679277034249594, "start_distance_m": 1108.0, "end_distance_m": 1208.0, "midpoint_distance_m": 1158.0, "start_elevation_m": 433.1787735089726, "end_elevation_m": 433.94670121239756, "start_xy": [ 897856.7064453814, 6493519.770816801 ], "end_xy": [ 897938.0992431109, 6493577.676744706 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 35.08841513543928, "start_distance_m": 1652.0, "end_distance_m": 1654.0, "midpoint_distance_m": 1653.0, "start_elevation_m": 480.593349511071, "end_elevation_m": 481.29511781377977, "start_xy": [ 898291.4340433873, 6493568.7082052305 ], "end_xy": [ 898293.422359242, 6493568.924075706 ] }, "max_3m": { "gradient_pct": 33.888936446980246, "start_distance_m": 1652.0, "end_distance_m": 1655.0, "midpoint_distance_m": 1653.5, "start_elevation_m": 480.593349511071, "end_elevation_m": 481.6100176044804, "start_xy": [ 898291.4340433873, 6493568.7082052305 ], "end_xy": [ 898294.4165171693, 6493569.032010943 ] } }, "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": 0.24, "obstruction_max_height_m": 31.07, "flagged_windows_m": [ 2, 3, 5, 10, 50, 100 ] }, "review": [], "extent": [ "descends_at_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_E897-N6493_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E897-N6494_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E898-N6493_0m5.tif" ], "calculated_at": "2026-09-17T02:28:51+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps2.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps2", "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": [ "E897-N6493", "E897-N6494", "E898-N6493" ], "elevation_blocks": [ "21LHD6PL@2025-03-07" ], "ign_dalles": [ "LHD_FXX_0897_6494_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0897_6495_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0898_6494_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD6PL" ], "ign_editions": [ "2025-03-07" ], "ign_dsm_edition": { "LHD_FXX_0897_6494_MNT_O_0M50_LAMB93_IGN69": "2025-03-07", "LHD_FXX_0897_6495_MNT_O_0M50_LAMB93_IGN69": "2025-03-07", "LHD_FXX_0898_6494_MNT_O_0M50_LAMB93_IGN69": "2025-03-07" }, "climb_origin": "discovered", "structure_own_ways": 9, "carriageway": { "stations": 93, "stations_resolved": 93, "width_median_m": 4.25, "width_p10_m": 2.3, "width_min_m": 1.0, "width_max_m": 12.0, "bounded_share": 0.258, "unbounded_share": 0.742, "confidence_median": 0.0, "width_median_bounded_m": 3.12, "window_m": [ 2074.0, 2099.0 ], "width_at_max25_m": 3.25, "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": 93, "stations_resolved": 93, "width_median_m": 7.75, "width_p10_m": 2.0, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.495, "unbounded_share": 0.505, "confidence_median": 0.0, "width_median_bounded_m": 3.5, "window_m": [ 2074.0, 2099.0 ], "width_at_max25_m": 9.0, "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": "Saint-Ondras", "county": "Is\u00e8re", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }