{ "ocl_version": "0.1.0", "name": "Chemin de Saint-Pierre", "slug": "chemin-de-saint-pierre", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 21.766274579567835, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 694.0, "end_distance_m": 696.0, "start_elevation_m": 1081.8287237568607, "end_elevation_m": 1082.264049248452, "min_gradient_pct": 2.361577937887205 }, { "window_m": 3.0, "max_gradient_pct": 21.896259693676257, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 695.0, "end_distance_m": 698.0, "start_elevation_m": 1082.020782823965, "end_elevation_m": 1082.6776706147753, "min_gradient_pct": 3.2353283340398775 }, { "window_m": 5.0, "max_gradient_pct": 20.907171911985643, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 693.0, "end_distance_m": 698.0, "start_elevation_m": 1081.632312019176, "end_elevation_m": 1082.6776706147753, "min_gradient_pct": 3.6712366552114872 }, { "window_m": 10.0, "max_gradient_pct": 20.465271092768944, "diagnostic": false, "flags": [], "start_distance_m": 430.0, "end_distance_m": 440.0, "start_elevation_m": 1043.1507249419647, "end_elevation_m": 1045.1972520512415, "min_gradient_pct": 3.90214666186921 }, { "window_m": 20.0, "max_gradient_pct": 19.73103986488468, "diagnostic": false, "flags": [], "start_distance_m": 691.0, "end_distance_m": 711.0, "start_elevation_m": 1081.2385492557041, "end_elevation_m": 1085.184757228681, "min_gradient_pct": 4.4764669181193995 }, { "window_m": 25.0, "max_gradient_pct": 19.508080887886535, "diagnostic": false, "flags": [], "start_distance_m": 690.0, "end_distance_m": 715.0, "start_elevation_m": 1081.0474151703042, "end_elevation_m": 1085.9244353922759, "min_gradient_pct": 5.163061288861172 }, { "window_m": 50.0, "max_gradient_pct": 18.167361144585357, "diagnostic": false, "flags": [], "start_distance_m": 680.0, "end_distance_m": 730.0, "start_elevation_m": 1079.3163878726568, "end_elevation_m": 1088.4000684449495, "min_gradient_pct": 7.30533775894628 }, { "window_m": 100.0, "max_gradient_pct": 18.002949357368834, "diagnostic": false, "flags": [], "start_distance_m": 690.0, "end_distance_m": 790.0, "start_elevation_m": 1081.0474151703042, "end_elevation_m": 1099.050364527673, "min_gradient_pct": 8.042066881222127 } ], "shape": { "ascent_concentration": 0.312, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 512.0, "shape_class": "sustained" }, "length_m": 1571.757203169487, "start_elevation_m": 990.6500868837894, "end_elevation_m": 1186.6923726659957, "endpoint_gain_m": 196.04228578220625, "overall_gradient_pct": 12.47280975629583, "accumulated_ascent_m": 196.05146017136167, "window_maxima": { "max_5m": { "gradient_pct": 20.907171911985643, "start_distance_m": 693.0, "end_distance_m": 698.0, "midpoint_distance_m": 695.5, "start_elevation_m": 1081.632312019176, "end_elevation_m": 1082.6776706147753, "start_xy": [ 935610.5950569867, 6378904.591231843 ], "end_xy": [ 935611.7923974467, 6378909.445035994 ] }, "max_10m": { "gradient_pct": 20.465271092768944, "start_distance_m": 430.0, "end_distance_m": 440.0, "midpoint_distance_m": 435.0, "start_elevation_m": 1043.1507249419647, "end_elevation_m": 1045.1972520512415, "start_xy": [ 935579.2723763137, 6378649.562363279 ], "end_xy": [ 935582.184980524, 6378658.905437525 ] }, "max_20m": { "gradient_pct": 19.73103986488468, "start_distance_m": 691.0, "end_distance_m": 711.0, "midpoint_distance_m": 701.0, "start_elevation_m": 1081.2385492557041, "end_elevation_m": 1085.184757228681, "start_xy": [ 935610.1117102505, 6378902.650516529 ], "end_xy": [ 935612.3560341356, 6378922.371926815 ] }, "max_25m": { "gradient_pct": 19.508080887886535, "start_distance_m": 690.0, "end_distance_m": 715.0, "midpoint_distance_m": 702.5, "start_elevation_m": 1081.0474151703042, "end_elevation_m": 1085.9244353922759, "start_xy": [ 935609.8700368825, 6378901.680158871 ], "end_xy": [ 935611.87987584, 6378926.326974645 ] }, "max_50m": { "gradient_pct": 18.167361144585357, "start_distance_m": 680.0, "end_distance_m": 730.0, "midpoint_distance_m": 705.0, "start_elevation_m": 1079.3163878726568, "end_elevation_m": 1088.4000684449495, "start_xy": [ 935607.4723171226, 6378891.971881876 ], "end_xy": [ 935607.0458562317, 6378940.519640439 ] }, "max_100m": { "gradient_pct": 18.002949357368834, "start_distance_m": 690.0, "end_distance_m": 790.0, "midpoint_distance_m": 740.0, "start_elevation_m": 1081.0474151703042, "end_elevation_m": 1099.050364527673, "start_xy": [ 935609.8700368825, 6378901.680158871 ], "end_xy": [ 935595.5561456289, 6378999.237532765 ] } }, "window_minima": { "min_5m": { "gradient_pct": 3.6712366552114872, "start_distance_m": 3.0, "end_distance_m": 8.0, "midpoint_distance_m": 5.5, "start_elevation_m": 990.825810808606, "end_elevation_m": 991.0093726413666, "start_xy": [ 935936.4409594912, 6378446.038273163 ], "end_xy": [ 935931.5042253096, 6378445.245395102 ] }, "min_10m": { "gradient_pct": 3.90214666186921, "start_distance_m": 4.0, "end_distance_m": 14.0, "midpoint_distance_m": 9.0, "start_elevation_m": 990.8576509252109, "end_elevation_m": 991.2478655913978, "start_xy": [ 935935.4536126548, 6378445.879697551 ], "end_xy": [ 935925.5723821113, 6378445.343335043 ] }, "min_20m": { "gradient_pct": 4.4764669181193995, "start_distance_m": 1.0, "end_distance_m": 21.0, "midpoint_distance_m": 11.0, "start_elevation_m": 990.7103695514003, "end_elevation_m": 991.6056629350242, "start_xy": [ 935938.4156531638, 6378446.355424388 ], "end_xy": [ 935918.6452900204, 6378446.351003224 ] }, "min_25m": { "gradient_pct": 5.163061288861172, "start_distance_m": 1.0, "end_distance_m": 26.0, "midpoint_distance_m": 13.5, "start_elevation_m": 990.7103695514003, "end_elevation_m": 992.0011348736156, "start_xy": [ 935938.4156531638, 6378446.355424388 ], "end_xy": [ 935913.9563055973, 6378448.039035322 ] }, "min_50m": { "gradient_pct": 7.30533775894628, "start_distance_m": 1456.0, "end_distance_m": 1506.0, "midpoint_distance_m": 1481.0, "start_elevation_m": 1177.3389520709136, "end_elevation_m": 1180.9916209503867, "start_xy": [ 935202.3702868795, 6379025.384293356 ], "end_xy": [ 935155.6927697852, 6379040.565001417 ] }, "min_100m": { "gradient_pct": 8.042066881222127, "start_distance_m": 1467.0, "end_distance_m": 1567.0, "midpoint_distance_m": 1517.0, "start_elevation_m": 1178.2104055166062, "end_elevation_m": 1186.2524723978283, "start_xy": [ 935192.3460131262, 6379029.895177761 ], "end_xy": [ 935100.1452271622, 6379015.786227595 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 21.766274579567835, "start_distance_m": 694.0, "end_distance_m": 696.0, "midpoint_distance_m": 695.0, "start_elevation_m": 1081.8287237568607, "end_elevation_m": 1082.264049248452, "start_xy": [ 935610.8367303547, 6378905.561589501 ], "end_xy": [ 935611.3200770909, 6378907.502304815 ] }, "max_3m": { "gradient_pct": 21.896259693676257, "start_distance_m": 695.0, "end_distance_m": 698.0, "midpoint_distance_m": 696.5, "start_elevation_m": 1082.020782823965, "end_elevation_m": 1082.6776706147753, "start_xy": [ 935611.0784037227, 6378906.531947157 ], "end_xy": [ 935611.7923974467, 6378909.445035994 ] } }, "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": 0.026, "windows_resited": [], "windows_unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.176, "obstruction_max_height_m": 17.47, "flagged_windows_m": [ 2, 3, 5 ] }, "excluded_ranges_m": [ [ 338.0, 378.0 ] ], "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_E935-N6378_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E935-N6379_0m5.tif" ], "calculated_at": "2026-09-17T05:05:31+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps3.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps3", "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": [ "E935-N6378", "E935-N6379" ], "elevation_blocks": [ "21LHD7PO@2025-04-02" ], "ign_dalles": [ "LHD_FXX_0935_6379_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0935_6380_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD7PO" ], "ign_editions": [ "2025-04-02" ], "ign_dsm_edition": { "LHD_FXX_0935_6379_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_0935_6380_MNT_O_0M50_LAMB93_IGN69": "2025-04-02" }, "climb_origin": "discovered", "structure_own_ways": 2, "structure_mask_ranges_m": [ [ 343.4, 373.4 ] ], "carriageway": { "stations": 68, "stations_resolved": 68, "width_median_m": 5.0, "width_p10_m": 3.75, "width_min_m": 2.75, "width_max_m": 12.0, "bounded_share": 0.456, "unbounded_share": 0.544, "confidence_median": 0.0, "width_median_bounded_m": 4.75, "window_m": [ 690.0, 715.0 ], "width_at_max25_m": 4.25, "window_stations": 6, "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": 68, "stations_resolved": 68, "width_median_m": 5.0, "width_p10_m": 1.18, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.853, "unbounded_share": 0.147, "confidence_median": 1.0, "width_median_bounded_m": 4.38, "window_m": [ 690.0, 715.0 ], "width_at_max25_m": 4.75, "window_stations": 6, "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": "Sigoyer", "county": "Hautes-Alpes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }