{ "ocl_version": "0.1.0", "name": "Col du Cucheron from Saint-Pierre-de-Chartreuse", "slug": "col-du-cucheron-from-saint-pierre-de-chartreuse", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 17.978508255635006, "diagnostic": true, "flags": [ "no_bench_excluded", "canopy_or_structure" ], "start_distance_m": 2005.0, "end_distance_m": 2007.0, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1075.8150959939683, "min_gradient_pct": -43.977938861308985, "suppressed_max_gradient_pct": 49.167815933066095, "suppressed_location_m": [ 1039.0, 1041.0 ] }, { "window_m": 3.0, "max_gradient_pct": 15.352034991216593, "diagnostic": true, "flags": [ "no_bench_excluded", "canopy_or_structure" ], "start_distance_m": 2005.0, "end_distance_m": 2008.0, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1075.916086878592, "min_gradient_pct": -38.88648519595866, "suppressed_max_gradient_pct": 46.0296342585328, "suppressed_location_m": [ 1038.0, 1041.0 ] }, { "window_m": 5.0, "max_gradient_pct": 13.457642595612924, "diagnostic": false, "flags": [ "no_bench_excluded", "canopy_or_structure" ], "start_distance_m": 2005.0, "end_distance_m": 2010.0, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1076.1284079586362, "min_gradient_pct": -24.58869708249722, "suppressed_max_gradient_pct": 34.358890201608574, "suppressed_location_m": [ 1030.0, 1035.0 ] }, { "window_m": 10.0, "max_gradient_pct": 13.342025881705695, "diagnostic": false, "flags": [ "no_bench_excluded" ], "start_distance_m": 1470.0, "end_distance_m": 1480.0, "start_elevation_m": 1018.8367677854462, "end_elevation_m": 1020.1709703736168, "min_gradient_pct": -11.739689176612274, "suppressed_max_gradient_pct": 31.022386537567854, "suppressed_location_m": [ 1031.0, 1041.0 ] }, { "window_m": 20.0, "max_gradient_pct": 12.68882099870666, "diagnostic": false, "flags": [ "no_bench_excluded" ], "start_distance_m": 1462.0, "end_distance_m": 1482.0, "start_elevation_m": 1017.891918488187, "end_elevation_m": 1020.4296826879283, "min_gradient_pct": -3.93527224523325, "suppressed_max_gradient_pct": 25.84982882478357, "suppressed_location_m": [ 1026.0, 1046.0 ] }, { "window_m": 25.0, "max_gradient_pct": 12.404098633327976, "diagnostic": false, "flags": [ "no_bench_excluded" ], "start_distance_m": 1457.0, "end_distance_m": 1482.0, "start_elevation_m": 1017.3286580295963, "end_elevation_m": 1020.4296826879283, "min_gradient_pct": -2.3898643920842915, "suppressed_max_gradient_pct": 22.304505985055584, "suppressed_location_m": [ 1021.0, 1046.0 ] }, { "window_m": 50.0, "max_gradient_pct": 11.660399798702201, "diagnostic": false, "flags": [ "no_bench_excluded" ], "start_distance_m": 1453.0, "end_distance_m": 1503.0, "start_elevation_m": 1016.8805330886876, "end_elevation_m": 1022.7107329880387, "min_gradient_pct": 2.527829263683998, "suppressed_max_gradient_pct": 15.254075058603576, "suppressed_location_m": [ 996.0, 1046.0 ] }, { "window_m": 100.0, "max_gradient_pct": 11.493249369279965, "diagnostic": false, "flags": [ "no_bench_excluded", "canopy_or_structure" ], "start_distance_m": 2088.0, "end_distance_m": 2188.0, "start_elevation_m": 1084.2235520007052, "end_elevation_m": 1095.7168013699852, "min_gradient_pct": 2.814690287236999, "suppressed_max_gradient_pct": 12.035639762956293, "suppressed_location_m": [ 947.0, 1047.0 ] } ], "shape": { "ascent_concentration": 0.314, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 163.0, "shape_class": "sustained" }, "length_m": 2777.5387325552456, "start_elevation_m": 905.5534685026923, "end_elevation_m": 1139.8512720742217, "endpoint_gain_m": 234.29780357152936, "overall_gradient_pct": 8.435446851752198, "accumulated_ascent_m": 235.72228596698017, "window_maxima": { "max_5m": { "gradient_pct": 13.457642595612924, "start_distance_m": 2005.0, "end_distance_m": 2010.0, "midpoint_distance_m": 2007.5, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1076.1284079586362, "start_xy": [ 921505.3995800383, 6477325.561177852 ], "end_xy": [ 921503.9643352756, 6477330.350757424 ] }, "max_10m": { "gradient_pct": 13.342025881705695, "start_distance_m": 1470.0, "end_distance_m": 1480.0, "midpoint_distance_m": 1475.0, "start_elevation_m": 1018.8367677854462, "end_elevation_m": 1020.1709703736168, "start_xy": [ 921184.1395367295, 6477008.091490757 ], "end_xy": [ 921185.7751103595, 6477017.7781972615 ] }, "max_20m": { "gradient_pct": 12.68882099870666, "start_distance_m": 1462.0, "end_distance_m": 1482.0, "midpoint_distance_m": 1472.0, "start_elevation_m": 1017.891918488187, "end_elevation_m": 1020.4296826879283, "start_xy": [ 921184.6553455098, 6477000.108136743 ], "end_xy": [ 921186.4999494904, 6477019.59431547 ] }, "max_25m": { "gradient_pct": 12.404098633327976, "start_distance_m": 1457.0, "end_distance_m": 1482.0, "midpoint_distance_m": 1469.5, "start_elevation_m": 1017.3286580295963, "end_elevation_m": 1020.4296826879283, "start_xy": [ 921184.7520990352, 6476995.111006815 ], "end_xy": [ 921186.4999494904, 6477019.59431547 ] }, "max_50m": { "gradient_pct": 11.660399798702201, "start_distance_m": 1453.0, "end_distance_m": 1503.0, "midpoint_distance_m": 1478.0, "start_elevation_m": 1016.8805330886876, "end_elevation_m": 1022.7107329880387, "start_xy": [ 921184.7610358961, 6476991.111016799 ], "end_xy": [ 921206.5565712675, 6477023.448693383 ] }, "max_100m": { "gradient_pct": 11.493249369279965, "start_distance_m": 2088.0, "end_distance_m": 2188.0, "midpoint_distance_m": 2138.0, "start_elevation_m": 1084.2235520007052, "end_elevation_m": 1095.7168013699852, "start_xy": [ 921507.4893365335, 6477407.662547697 ], "end_xy": [ 921509.2765412951, 6477507.480634583 ] } }, "window_minima": { "min_5m": { "gradient_pct": -24.58869708249722, "start_distance_m": 1053.0, "end_distance_m": 1058.0, "midpoint_distance_m": 1055.5, "start_elevation_m": 980.7022053045224, "end_elevation_m": 979.4727704503975, "start_xy": [ 920984.2819542381, 6476650.5026825955 ], "end_xy": [ 920986.8564039196, 6476654.788964065 ] }, "min_10m": { "gradient_pct": -11.739689176612274, "start_distance_m": 1048.0, "end_distance_m": 1058.0, "midpoint_distance_m": 1053.0, "start_elevation_m": 980.6467393680588, "end_elevation_m": 979.4727704503975, "start_xy": [ 920981.7075045565, 6476646.216401126 ], "end_xy": [ 920986.8564039196, 6476654.788964065 ] }, "min_20m": { "gradient_pct": -3.93527224523325, "start_distance_m": 1048.0, "end_distance_m": 1068.0, "midpoint_distance_m": 1058.0, "start_elevation_m": 980.6467393680588, "end_elevation_m": 979.8596849190121, "start_xy": [ 920981.7075045565, 6476646.216401126 ], "end_xy": [ 920993.1403818373, 6476662.563721833 ] }, "min_25m": { "gradient_pct": -2.3898643920842915, "start_distance_m": 1046.0, "end_distance_m": 1071.0, "midpoint_distance_m": 1058.5, "start_elevation_m": 980.5402470364055, "end_elevation_m": 979.9427809383844, "start_xy": [ 920980.6777246839, 6476644.501888538 ], "end_xy": [ 920995.0370321369, 6476664.8880965095 ] }, "min_50m": { "gradient_pct": 2.527829263683998, "start_distance_m": 48.0, "end_distance_m": 98.0, "midpoint_distance_m": 73.0, "start_elevation_m": 907.0267445088502, "end_elevation_m": 908.2906591406922, "start_xy": [ 920547.4355609874, 6475810.141846669 ], "end_xy": [ 920545.434700573, 6475859.649799948 ] }, "min_100m": { "gradient_pct": 2.814690287236999, "start_distance_m": 2.0, "end_distance_m": 102.0, "midpoint_distance_m": 52.0, "start_elevation_m": 905.592726980404, "end_elevation_m": 908.407417267641, "start_xy": [ 920554.3214280853, 6475764.750999383 ], "end_xy": [ 920545.9481683684, 6475863.616706907 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 17.978508255635006, "start_distance_m": 2005.0, "end_distance_m": 2007.0, "midpoint_distance_m": 2006.0, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1075.8150959939683, "start_xy": [ 921505.3995800383, 6477325.561177852 ], "end_xy": [ 921504.8254821332, 6477327.477009681 ] }, "max_3m": { "gradient_pct": 15.352034991216593, "start_distance_m": 2005.0, "end_distance_m": 2008.0, "midpoint_distance_m": 2006.5, "start_elevation_m": 1075.4555258288556, "end_elevation_m": 1075.916086878592, "start_xy": [ 921505.3995800383, 6477325.561177852 ], "end_xy": [ 921504.5384331807, 6477328.434925595 ] } }, "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": { "no_bench_suppression": { "masked_fraction": 0.011, "windows_resited": [ 2.0, 3.0, 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "windows_unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.091, "obstruction_max_height_m": 24.2, "flagged_windows_m": [ 2, 3, 5, 100 ] }, "excluded_ranges_m": [ [ 1030.0, 1060.0 ] ], "review": [], "extent": [] }, "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_E920-N6475_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E920-N6476_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E920-N6477_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E921-N6476_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E921-N6477_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E921-N6478_0m5.tif" ], "calculated_at": "2026-09-17T04:31:18+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": [ "E920-N6475", "E920-N6476", "E920-N6477", "E921-N6476", "E921-N6477", "E921-N6478" ], "elevation_blocks": [ "21LHD6PM@2025-03-25" ], "ign_dalles": [ "LHD_FXX_0920_6476_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0920_6477_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0920_6478_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0921_6477_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0921_6478_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0921_6479_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD6PM" ], "ign_editions": [ "2025-03-25" ], "ign_dsm_edition": { "LHD_FXX_0920_6476_MNT_O_0M50_LAMB93_IGN69": "2025-03-25", "LHD_FXX_0920_6477_MNT_O_0M50_LAMB93_IGN69": "2025-03-25", "LHD_FXX_0920_6478_MNT_O_0M50_LAMB93_IGN69": "2025-03-25", "LHD_FXX_0921_6477_MNT_O_0M50_LAMB93_IGN69": "2025-03-25", "LHD_FXX_0921_6478_MNT_O_0M50_LAMB93_IGN69": "2025-03-25", "LHD_FXX_0921_6479_MNT_O_0M50_LAMB93_IGN69": "2025-03-25" }, "climb_origin": "named-pass", "structure_own_ways": 7, "carriageway": { "stations": 118, "stations_resolved": 118, "width_median_m": 7.25, "width_p10_m": 5.68, "width_min_m": 1.0, "width_max_m": 12.0, "bounded_share": 0.347, "unbounded_share": 0.653, "confidence_median": 0.0, "width_median_bounded_m": 7.5, "window_m": [ 1457.0, 1482.0 ], "width_at_max25_m": 8.75, "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": 118, "stations_resolved": 118, "width_median_m": 8.5, "width_p10_m": 1.68, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.669, "unbounded_share": 0.331, "confidence_median": 1.0, "width_median_bounded_m": 7.25, "window_m": [ 1457.0, 1482.0 ], "width_at_max25_m": 10.5, "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-Pierre-de-Chartreuse", "county": "Is\u00e8re", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }