{ "ocl_version": "0.1.0", "name": "Chemin d'Aran\u00e7on", "slug": "chemin-d-arancon", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 31.453943986122113, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 1229.0, "end_distance_m": 1231.0, "start_elevation_m": 659.6714179800396, "end_elevation_m": 660.300496859762, "min_gradient_pct": -14.537335252322237 }, { "window_m": 3.0, "max_gradient_pct": 29.82425134961204, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 1228.0, "end_distance_m": 1231.0, "start_elevation_m": 659.4057693192736, "end_elevation_m": 660.300496859762, "min_gradient_pct": -8.444796838879634 }, { "window_m": 5.0, "max_gradient_pct": 26.207962812040932, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1228.0, "end_distance_m": 1233.0, "start_elevation_m": 659.4057693192736, "end_elevation_m": 660.7161674598757, "min_gradient_pct": -6.346311414381489 }, { "window_m": 10.0, "max_gradient_pct": 22.156732179523715, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1226.0, "end_distance_m": 1236.0, "start_elevation_m": 659.0634358159391, "end_elevation_m": 661.2791090338915, "min_gradient_pct": -5.889412439692023 }, { "window_m": 20.0, "max_gradient_pct": 20.518278362300748, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1228.0, "end_distance_m": 1248.0, "start_elevation_m": 659.4057693192736, "end_elevation_m": 663.5094249917338, "min_gradient_pct": -4.949735198246685 }, { "window_m": 25.0, "max_gradient_pct": 20.078354682964346, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1224.0, "end_distance_m": 1249.0, "start_elevation_m": 658.703938030803, "end_elevation_m": 663.7235267015441, "min_gradient_pct": -4.365058670843609 }, { "window_m": 50.0, "max_gradient_pct": 17.598605821264755, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1199.0, "end_distance_m": 1249.0, "start_elevation_m": 654.9242237909117, "end_elevation_m": 663.7235267015441, "min_gradient_pct": -2.1406248657808646 }, { "window_m": 100.0, "max_gradient_pct": 15.927806260767056, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1167.0, "end_distance_m": 1267.0, "start_elevation_m": 650.3856976773457, "end_elevation_m": 666.3135039381127, "min_gradient_pct": -0.5050995920479409 } ], "shape": { "ascent_concentration": 0.46, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 101.0, "shape_class": "stepped" }, "length_m": 1388.6523293819266, "start_elevation_m": 606.334027556633, "end_elevation_m": 676.4120031220548, "endpoint_gain_m": 70.07797556542175, "overall_gradient_pct": 5.046473770480237, "accumulated_ascent_m": 73.50086745808437, "window_maxima": { "max_5m": { "gradient_pct": 26.207962812040932, "start_distance_m": 1228.0, "end_distance_m": 1233.0, "midpoint_distance_m": 1230.5, "start_elevation_m": 659.4057693192736, "end_elevation_m": 660.7161674598757, "start_xy": [ 894915.1009079786, 6525812.798903362 ], "end_xy": [ 894910.9339855335, 6525815.562371714 ] }, "max_10m": { "gradient_pct": 22.156732179523715, "start_distance_m": 1226.0, "end_distance_m": 1236.0, "midpoint_distance_m": 1231.0, "start_elevation_m": 659.0634358159391, "end_elevation_m": 661.2791090338915, "start_xy": [ 894916.7676769567, 6525811.693516021 ], "end_xy": [ 894908.4338320665, 6525817.220452726 ] }, "max_20m": { "gradient_pct": 20.518278362300748, "start_distance_m": 1228.0, "end_distance_m": 1248.0, "midpoint_distance_m": 1238.0, "start_elevation_m": 659.4057693192736, "end_elevation_m": 663.5094249917338, "start_xy": [ 894915.1009079786, 6525812.798903362 ], "end_xy": [ 894898.4689518455, 6525823.90516937 ] }, "max_25m": { "gradient_pct": 20.078354682964346, "start_distance_m": 1224.0, "end_distance_m": 1249.0, "midpoint_distance_m": 1236.5, "start_elevation_m": 658.703938030803, "end_elevation_m": 663.7235267015441, "start_xy": [ 894918.4344459347, 6525810.588128679 ], "end_xy": [ 894897.6501883961, 6525824.479300378 ] }, "max_50m": { "gradient_pct": 17.598605821264755, "start_distance_m": 1199.0, "end_distance_m": 1249.0, "midpoint_distance_m": 1224.0, "start_elevation_m": 654.9242237909117, "end_elevation_m": 663.7235267015441, "start_xy": [ 894940.625543674, 6525799.213346888 ], "end_xy": [ 894897.6501883961, 6525824.479300378 ] }, "max_100m": { "gradient_pct": 15.927806260767056, "start_distance_m": 1167.0, "end_distance_m": 1267.0, "midpoint_distance_m": 1217.0, "start_elevation_m": 650.3856976773457, "end_elevation_m": 666.3135039381127, "start_xy": [ 894970.0801920118, 6525786.813233843 ], "end_xy": [ 894882.9124463066, 6525834.813658514 ] } }, "window_minima": { "min_5m": { "gradient_pct": -6.346311414381489, "start_distance_m": 0.0, "end_distance_m": 5.0, "midpoint_distance_m": 2.5, "start_elevation_m": 606.334027556633, "end_elevation_m": 606.016711985914, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894770.2818497076, 6526722.189895444 ] }, "min_10m": { "gradient_pct": -5.889412439692023, "start_distance_m": 0.0, "end_distance_m": 10.0, "midpoint_distance_m": 5.0, "start_elevation_m": 606.334027556633, "end_elevation_m": 605.7450863126638, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894771.6676994152, 6526717.385790887 ] }, "min_20m": { "gradient_pct": -4.949735198246685, "start_distance_m": 0.0, "end_distance_m": 20.0, "midpoint_distance_m": 10.0, "start_elevation_m": 606.334027556633, "end_elevation_m": 605.3440805169837, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894774.6326884407, 6526707.841029008 ] }, "min_25m": { "gradient_pct": -4.365058670843609, "start_distance_m": 0.0, "end_distance_m": 25.0, "midpoint_distance_m": 12.5, "start_elevation_m": 606.334027556633, "end_elevation_m": 605.2427628889221, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894776.3635545742, 6526703.150175949 ] }, "min_50m": { "gradient_pct": -2.1406248657808646, "start_distance_m": 0.0, "end_distance_m": 50.0, "midpoint_distance_m": 25.0, "start_elevation_m": 606.334027556633, "end_elevation_m": 605.2637151237426, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894785.0178852415, 6526679.695910649 ] }, "min_100m": { "gradient_pct": -0.5050995920479409, "start_distance_m": 0.0, "end_distance_m": 100.0, "midpoint_distance_m": 50.0, "start_elevation_m": 606.334027556633, "end_elevation_m": 605.8289279645851, "start_xy": [ 894768.896, 6526726.994 ], "end_xy": [ 894802.317909377, 6526632.784257461 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 31.453943986122113, "start_distance_m": 1229.0, "end_distance_m": 1231.0, "midpoint_distance_m": 1230.0, "start_elevation_m": 659.6714179800396, "end_elevation_m": 660.300496859762, "start_xy": [ 894914.2675234897, 6525813.3515970325 ], "end_xy": [ 894912.6007545115, 6525814.456984373 ] }, "max_3m": { "gradient_pct": 29.82425134961204, "start_distance_m": 1228.0, "end_distance_m": 1231.0, "midpoint_distance_m": 1229.5, "start_elevation_m": 659.4057693192736, "end_elevation_m": 660.300496859762, "start_xy": [ 894915.1009079786, 6525812.798903362 ], "end_xy": [ 894912.6007545115, 6525814.456984373 ] } }, "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": 0.317, "obstruction_max_height_m": 21.04, "flagged_windows_m": [ 2, 3, 5, 10, 20, 25, 50, 100 ] }, "review": [], "extent": [ "descends_at_start" ] }, "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_E894-N6525_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E894-N6526_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E895-N6525_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E895-N6526_0m5.tif" ], "calculated_at": "2026-09-17T03:55:04+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": [ "E894-N6525", "E894-N6526", "E895-N6525", "E895-N6526" ], "elevation_blocks": [ "21LHD6PL@2025-03-07" ], "ign_dalles": [ "LHD_FXX_0894_6526_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0894_6527_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0895_6526_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0895_6527_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD6PL" ], "ign_editions": [ "2025-03-07" ], "ign_dsm_edition": { "LHD_FXX_0894_6526_MNT_O_0M50_LAMB93_IGN69": "2025-03-07", "LHD_FXX_0894_6527_MNT_O_0M50_LAMB93_IGN69": "2025-03-07", "LHD_FXX_0895_6526_MNT_O_0M50_LAMB93_IGN69": "2025-03-07", "LHD_FXX_0895_6527_MNT_O_0M50_LAMB93_IGN69": "2025-03-07" }, "climb_origin": "discovered", "structure_own_ways": 2, "carriageway": { "stations": 62, "stations_resolved": 62, "width_median_m": 4.0, "width_p10_m": 2.75, "width_min_m": 2.25, "width_max_m": 9.0, "bounded_share": 0.371, "unbounded_share": 0.629, "confidence_median": 0.0, "width_median_bounded_m": 4.0, "window_m": [ 1224.0, 1249.0 ], "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": 62, "stations_resolved": 62, "width_median_m": 3.5, "width_p10_m": 1.0, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.855, "unbounded_share": 0.145, "confidence_median": 1.0, "width_median_bounded_m": 3.25, "window_m": [ 1224.0, 1249.0 ], "width_at_max25_m": 1.25, "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": "Lompnas", "county": "Ain", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }