{ "ocl_version": "0.1.0", "name": "Chemin de Saint-Julien", "slug": "chemin-de-saint-julien", "confidence": "B", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 41.71210859490966, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 681.0, "end_distance_m": 683.0, "start_elevation_m": 23.096267313762837, "end_elevation_m": 23.93050948566103, "min_gradient_pct": -35.00015835472112 }, { "window_m": 3.0, "max_gradient_pct": 34.4179610728902, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 680.0, "end_distance_m": 683.0, "start_elevation_m": 22.897970653474324, "end_elevation_m": 23.93050948566103, "min_gradient_pct": -29.058049606956498 }, { "window_m": 5.0, "max_gradient_pct": 23.899584969889105, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1156.0, "end_distance_m": 1161.0, "start_elevation_m": 53.01070261239794, "end_elevation_m": 54.2056818608924, "min_gradient_pct": -15.546580715738259 }, { "window_m": 10.0, "max_gradient_pct": 23.007189798583028, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1151.0, "end_distance_m": 1161.0, "start_elevation_m": 51.904962881034095, "end_elevation_m": 54.2056818608924, "min_gradient_pct": -6.96482755938856 }, { "window_m": 20.0, "max_gradient_pct": 21.23690203739045, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1146.0, "end_distance_m": 1166.0, "start_elevation_m": 50.981893808741944, "end_elevation_m": 55.229274216220034, "min_gradient_pct": -2.4431658138931844 }, { "window_m": 25.0, "max_gradient_pct": 20.649998927468715, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1146.0, "end_distance_m": 1171.0, "start_elevation_m": 50.981893808741944, "end_elevation_m": 56.14439354060912, "min_gradient_pct": -1.111171272571184 }, { "window_m": 50.0, "max_gradient_pct": 18.05833023911326, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1147.0, "end_distance_m": 1197.0, "start_elevation_m": 51.16730866015355, "end_elevation_m": 60.19647377971018, "min_gradient_pct": -0.3775881408794106 }, { "window_m": 100.0, "max_gradient_pct": 16.14396487379564, "diagnostic": false, "flags": [ "canopy_or_structure" ], "start_distance_m": 1099.0, "end_distance_m": 1199.0, "start_elevation_m": 44.36591084722927, "end_elevation_m": 60.50987572102491, "min_gradient_pct": 0.15792669244942914 } ], "shape": { "ascent_concentration": 0.46, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 127.0, "shape_class": "stepped" }, "length_m": 1342.0941924344513, "start_elevation_m": 8.620972528289647, "end_elevation_m": 66.60147362132503, "endpoint_gain_m": 57.98050109303538, "overall_gradient_pct": 4.320151403670364, "accumulated_ascent_m": 63.23265824844006, "window_maxima": { "max_5m": { "gradient_pct": 23.899584969889105, "start_distance_m": 1156.0, "end_distance_m": 1161.0, "midpoint_distance_m": 1158.5, "start_elevation_m": 53.01070261239794, "end_elevation_m": 54.2056818608924, "start_xy": [ 1218144.0032038086, 6052184.713254766 ], "end_xy": [ 1218148.7970297197, 6052183.292257533 ] }, "max_10m": { "gradient_pct": 23.007189798583028, "start_distance_m": 1151.0, "end_distance_m": 1161.0, "midpoint_distance_m": 1156.0, "start_elevation_m": 51.904962881034095, "end_elevation_m": 54.2056818608924, "start_xy": [ 1218139.2093778977, 6052186.134251998 ], "end_xy": [ 1218148.7970297197, 6052183.292257533 ] }, "max_20m": { "gradient_pct": 21.23690203739045, "start_distance_m": 1146.0, "end_distance_m": 1166.0, "midpoint_distance_m": 1156.0, "start_elevation_m": 50.981893808741944, "end_elevation_m": 55.229274216220034, "start_xy": [ 1218134.4155519865, 6052187.555249231 ], "end_xy": [ 1218153.5908556306, 6052181.8712603 ] }, "max_25m": { "gradient_pct": 20.649998927468715, "start_distance_m": 1146.0, "end_distance_m": 1171.0, "midpoint_distance_m": 1158.5, "start_elevation_m": 50.981893808741944, "end_elevation_m": 56.14439354060912, "start_xy": [ 1218134.4155519865, 6052187.555249231 ], "end_xy": [ 1218158.389884298, 6052180.4996617455 ] }, "max_50m": { "gradient_pct": 18.05833023911326, "start_distance_m": 1147.0, "end_distance_m": 1197.0, "midpoint_distance_m": 1172.0, "start_elevation_m": 51.16730866015355, "end_elevation_m": 60.19647377971018, "start_xy": [ 1218135.3743171687, 6052187.2710497845 ], "end_xy": [ 1218184.3387619958, 6052181.396557129 ] }, "max_100m": { "gradient_pct": 16.14396487379564, "start_distance_m": 1099.0, "end_distance_m": 1199.0, "midpoint_distance_m": 1149.0, "start_elevation_m": 44.36591084722927, "end_elevation_m": 60.50987572102491, "start_xy": [ 1218087.9631484451, 6052183.968514312 ], "end_xy": [ 1218186.3379723874, 6052181.340362735 ] } }, "window_minima": { "min_5m": { "gradient_pct": -15.546580715738259, "start_distance_m": 683.0, "end_distance_m": 688.0, "midpoint_distance_m": 685.5, "start_elevation_m": 23.93050948566103, "end_elevation_m": 23.153180449874117, "start_xy": [ 1217748.194079485, 6052081.316571564 ], "end_xy": [ 1217753.1686738143, 6052080.813171864 ] }, "min_10m": { "gradient_pct": -6.96482755938856, "start_distance_m": 683.0, "end_distance_m": 693.0, "midpoint_distance_m": 688.0, "start_elevation_m": 23.93050948566103, "end_elevation_m": 23.234026729722174, "start_xy": [ 1217748.194079485, 6052081.316571564 ], "end_xy": [ 1217758.1432681435, 6052080.309772162 ] }, "min_20m": { "gradient_pct": -2.4431658138931844, "start_distance_m": 683.0, "end_distance_m": 703.0, "midpoint_distance_m": 693.0, "start_elevation_m": 23.93050948566103, "end_elevation_m": 23.441876322882393, "start_xy": [ 1217748.194079485, 6052081.316571564 ], "end_xy": [ 1217768.0924568018, 6052079.302972758 ] }, "min_25m": { "gradient_pct": -1.111171272571184, "start_distance_m": 683.0, "end_distance_m": 708.0, "midpoint_distance_m": 695.5, "start_elevation_m": 23.93050948566103, "end_elevation_m": 23.652716667518234, "start_xy": [ 1217748.194079485, 6052081.316571564 ], "end_xy": [ 1217773.067051131, 6052078.799573056 ] }, "min_50m": { "gradient_pct": -0.3775881408794106, "start_distance_m": 327.0, "end_distance_m": 377.0, "midpoint_distance_m": 352.0, "start_elevation_m": 18.16331461024062, "end_elevation_m": 17.974520539800913, "start_xy": [ 1217395.6108358183, 6052071.76402203 ], "end_xy": [ 1217443.8580030529, 6052084.623544176 ] }, "min_100m": { "gradient_pct": 0.15792669244942914, "start_distance_m": 277.0, "end_distance_m": 377.0, "midpoint_distance_m": 327.0, "start_elevation_m": 17.816593847351484, "end_elevation_m": 17.974520539800913, "start_xy": [ 1217349.0847406266, 6052053.571195057 ], "end_xy": [ 1217443.8580030529, 6052084.623544176 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 41.71210859490966, "start_distance_m": 681.0, "end_distance_m": 683.0, "midpoint_distance_m": 682.0, "start_elevation_m": 23.096267313762837, "end_elevation_m": 23.93050948566103, "start_xy": [ 1217746.2042417533, 6052081.5179314455 ], "end_xy": [ 1217748.194079485, 6052081.316571564 ] }, "max_3m": { "gradient_pct": 34.4179610728902, "start_distance_m": 680.0, "end_distance_m": 683.0, "midpoint_distance_m": 681.5, "start_elevation_m": 22.897970653474324, "end_elevation_m": 23.93050948566103, "start_xy": [ 1217745.2093228875, 6052081.618611386 ], "end_xy": [ 1217748.194079485, 6052081.316571564 ] } }, "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": 0.186, "obstruction_max_height_m": 8.35, "flagged_windows_m": [ 2, 3, 5, 10, 20, 25, 50, 100 ] }, "review": [], "extent": [] }, "provenance": { "analysis_version": "0.1.0", "run_manifest": { "manifest_version": "1", "code_git_sha": "33abfff569d4360542e616d0d42c1b94d0a711fa", "code_git_dirty": "false", "analysis_version": "0.1.0", "analysis_config_digest": "sha256:8c94015b54267da4", "python": "3.14.4", "numpy": "2.5.3", "rasterio": "1.5.1", "pyproj": "3.8.0", "laspy": "2.7.0", "shapely": "2.1.2", "pyosmium": "4.3.1", "libosmium": "2.23.1", "gdal": "3.12.4", "proj": "9.8.1", "run_id": "fr-co3", "road_pbf": "block-batch-fr-co3.osm.pbf", "region_key": "france", "crs": "EPSG:2154", "elevation_provider_key": "ign-lidarhd", "tile_index": "wms-grid", "authority": "bdtopo", "registry_pbf": "france-vosges-2026-09-16.osm.pbf", "tile_index_snapshot": "sha256:2a717d675f2607cc" }, "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_E1217-N6051_0m5@21LHDCorseVU-2025-04-02.tif", "data/cache/fr/ign-lidarhd_dtm_E1217-N6052_0m5@21LHDCorseVU-2025-04-02.tif", "data/cache/fr/ign-lidarhd_dtm_E1218-N6051_0m5@21LHDCorseVU-2025-04-02.tif", "data/cache/fr/ign-lidarhd_dtm_E1218-N6052_0m5@21LHDCorseVU-2025-04-02.tif" ], "calculated_at": "2026-09-25T00:48:43+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-co3.osm.pbf", "osm_snapshot": "", "run_id": "fr-co3", "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": [ "E1217-N6051", "E1217-N6052", "E1218-N6051", "E1218-N6052" ], "elevation_blocks": [ "21LHDCorseVU@2025-04-02" ], "ign_dalles": [ "LHD_FXX_1217_6052_MNT_O_0M50_LAMB93_IGN78", "LHD_FXX_1217_6053_MNT_O_0M50_LAMB93_IGN78", "LHD_FXX_1218_6052_MNT_O_0M50_LAMB93_IGN78", "LHD_FXX_1218_6053_MNT_O_0M50_LAMB93_IGN78" ], "ign_missions": [ "21LHDCorseVU" ], "ign_editions": [ "2025-04-02" ], "ign_dsm_edition": { "LHD_FXX_1217_6052_MNT_O_0M50_LAMB93_IGN78": "2025-04-02", "LHD_FXX_1217_6053_MNT_O_0M50_LAMB93_IGN78": "2025-04-02", "LHD_FXX_1218_6052_MNT_O_0M50_LAMB93_IGN78": "2025-04-02", "LHD_FXX_1218_6053_MNT_O_0M50_LAMB93_IGN78": "2025-04-02" }, "climb_origin": "discovered", "structure_own_ways": 4, "carriageway": { "stations": 60, "stations_resolved": 60, "width_median_m": 3.75, "width_p10_m": 2.23, "width_min_m": 1.0, "width_max_m": 11.5, "bounded_share": 0.517, "unbounded_share": 0.483, "confidence_median": 0.534, "width_median_bounded_m": 3.25, "window_m": [ 1146.0, 1171.0 ], "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": 60, "stations_resolved": 60, "width_median_m": 3.38, "width_p10_m": 1.0, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.883, "unbounded_share": 0.117, "confidence_median": 1.0, "width_median_bounded_m": 3.0, "window_m": [ 1146.0, 1171.0 ], "width_at_max25_m": 3.0, "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": "Bonifacio / Bunifaziu", "county": "Corse-du-Sud", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }