{ "ocl_version": "0.1.0", "name": "Impasse de Bel Air", "slug": "impasse-de-bel-air", "confidence": "A", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 23.641900086801115, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 864.0, "end_distance_m": 866.0, "start_elevation_m": 607.9917577566825, "end_elevation_m": 608.4645957584186, "min_gradient_pct": -3.062903480559953 }, { "window_m": 3.0, "max_gradient_pct": 23.550676296247275, "diagnostic": true, "flags": [ "canopy_or_structure" ], "start_distance_m": 863.0, "end_distance_m": 866.0, "start_elevation_m": 607.7580754695311, "end_elevation_m": 608.4645957584186, "min_gradient_pct": -2.404782176123869 }, { "window_m": 5.0, "max_gradient_pct": 22.19843814545129, "diagnostic": false, "flags": [], "start_distance_m": 694.0, "end_distance_m": 699.0, "start_elevation_m": 585.3560345337935, "end_elevation_m": 586.465956441066, "min_gradient_pct": -1.8679515236703992 }, { "window_m": 10.0, "max_gradient_pct": 22.011763726640083, "diagnostic": false, "flags": [], "start_distance_m": 693.0, "end_distance_m": 703.0, "start_elevation_m": 585.1417136434573, "end_elevation_m": 587.3428900161213, "min_gradient_pct": -1.6937808985017 }, { "window_m": 20.0, "max_gradient_pct": 21.60230508243103, "diagnostic": false, "flags": [], "start_distance_m": 694.0, "end_distance_m": 714.0, "start_elevation_m": 585.3560345337935, "end_elevation_m": 589.6764955502797, "min_gradient_pct": -1.6146736651842275 }, { "window_m": 25.0, "max_gradient_pct": 21.46885310485186, "diagnostic": false, "flags": [], "start_distance_m": 685.0, "end_distance_m": 710.0, "start_elevation_m": 583.4716346411617, "end_elevation_m": 588.8388479173747, "min_gradient_pct": -1.5049463693708276 }, { "window_m": 50.0, "max_gradient_pct": 20.28974365092654, "diagnostic": false, "flags": [], "start_distance_m": 673.0, "end_distance_m": 723.0, "start_elevation_m": 581.230063234576, "end_elevation_m": 591.3749350600393, "min_gradient_pct": -0.9976757294502931 }, { "window_m": 100.0, "max_gradient_pct": 17.433273449271383, "diagnostic": false, "flags": [], "start_distance_m": 641.0, "end_distance_m": 741.0, "start_elevation_m": 576.5043961685815, "end_elevation_m": 593.9376696178529, "min_gradient_pct": -0.6292556820633308 } ], "shape": { "ascent_concentration": 0.477, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 147.0, "shape_class": "stepped" }, "length_m": 870.9005812465491, "start_elevation_m": 544.9579065351631, "end_elevation_m": 609.0147057651321, "endpoint_gain_m": 64.05679922996899, "overall_gradient_pct": 7.3552367066149325, "accumulated_ascent_m": 64.96463099399125, "window_maxima": { "max_5m": { "gradient_pct": 22.19843814545129, "start_distance_m": 694.0, "end_distance_m": 699.0, "midpoint_distance_m": 696.5, "start_elevation_m": 585.3560345337935, "end_elevation_m": 586.465956441066, "start_xy": [ 818893.26366503, 6514022.750488719 ], "end_xy": [ 818896.9387410998, 6514026.14074179 ] }, "max_10m": { "gradient_pct": 22.011763726640083, "start_distance_m": 693.0, "end_distance_m": 703.0, "midpoint_distance_m": 698.0, "start_elevation_m": 585.1417136434573, "end_elevation_m": 587.3428900161213, "start_xy": [ 818892.5286498162, 6514022.072438105 ], "end_xy": [ 818899.8788019555, 6514028.852944246 ] }, "max_20m": { "gradient_pct": 21.60230508243103, "start_distance_m": 694.0, "end_distance_m": 714.0, "midpoint_distance_m": 704.0, "start_elevation_m": 585.3560345337935, "end_elevation_m": 589.6764955502797, "start_xy": [ 818893.26366503, 6514022.750488719 ], "end_xy": [ 818907.9639693089, 6514036.311501001 ] }, "max_25m": { "gradient_pct": 21.46885310485186, "start_distance_m": 685.0, "end_distance_m": 710.0, "midpoint_distance_m": 697.5, "start_elevation_m": 583.4716346411617, "end_elevation_m": 588.8388479173747, "start_xy": [ 818886.6440468738, 6514016.652899353 ], "end_xy": [ 818905.0239084531, 6514033.599298544 ] }, "max_50m": { "gradient_pct": 20.28974365092654, "start_distance_m": 673.0, "end_distance_m": 723.0, "midpoint_distance_m": 698.0, "start_elevation_m": 581.230063234576, "end_elevation_m": 591.3749350600393, "start_xy": [ 818877.8097806899, 6514008.531585359 ], "end_xy": [ 818914.5791062342, 6514042.413956528 ] }, "max_100m": { "gradient_pct": 17.433273449271383, "start_distance_m": 641.0, "end_distance_m": 741.0, "midpoint_distance_m": 691.0, "start_elevation_m": 576.5043961685815, "end_elevation_m": 593.9376696178529, "start_xy": [ 818851.8631625519, 6513990.13175006 ], "end_xy": [ 818928.7346297513, 6514053.476808514 ] } }, "window_minima": { "min_5m": { "gradient_pct": -1.8679515236703992, "start_distance_m": 479.0, "end_distance_m": 484.0, "midpoint_distance_m": 481.5, "start_elevation_m": 567.8687390139353, "end_elevation_m": 567.7753414377518, "start_xy": [ 818863.742016635, 6513966.733606402 ], "end_xy": [ 818858.8931069988, 6513965.513739467 ] }, "min_10m": { "gradient_pct": -1.6937808985017, "start_distance_m": 478.0, "end_distance_m": 488.0, "midpoint_distance_m": 483.0, "start_elevation_m": 567.8857234532576, "end_elevation_m": 567.7163453634074, "start_xy": [ 818864.7117985623, 6513966.977579788 ], "end_xy": [ 818855.0139792898, 6513964.537845918 ] }, "min_20m": { "gradient_pct": -1.6146736651842275, "start_distance_m": 476.0, "end_distance_m": 496.0, "midpoint_distance_m": 486.0, "start_elevation_m": 567.9147491243137, "end_elevation_m": 567.5918143912769, "start_xy": [ 818866.6513624168, 6513967.465526563 ], "end_xy": [ 818847.2634673443, 6513962.556810065 ] }, "min_25m": { "gradient_pct": -1.5049463693708276, "start_distance_m": 471.0, "end_distance_m": 496.0, "midpoint_distance_m": 483.5, "start_elevation_m": 567.9680509836196, "end_elevation_m": 567.5918143912769, "start_xy": [ 818871.500272053, 6513968.685393498 ], "end_xy": [ 818847.2634673443, 6513962.556810065 ] }, "min_50m": { "gradient_pct": -0.9976757294502931, "start_distance_m": 456.0, "end_distance_m": 506.0, "midpoint_distance_m": 481.0, "start_elevation_m": 568.0625843906045, "end_elevation_m": 567.5637465258793, "start_xy": [ 818886.0470009617, 6513972.344994304 ], "end_xy": [ 818837.6288444911, 6513959.878369758 ] }, "min_100m": { "gradient_pct": -0.6292556820633308, "start_distance_m": 437.0, "end_distance_m": 537.0, "midpoint_distance_m": 487.0, "start_elevation_m": 568.1075727792803, "end_elevation_m": 567.478317097217, "start_xy": [ 818904.4728575794, 6513976.980488658 ], "end_xy": [ 818807.761513646, 6513951.575204808 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 23.641900086801115, "start_distance_m": 864.0, "end_distance_m": 866.0, "midpoint_distance_m": 865.0, "start_elevation_m": 607.9917577566825, "end_elevation_m": 608.4645957584186, "start_xy": [ 819030.6282062316, 6514120.624842495 ], "end_xy": [ 819032.4326321331, 6514121.487424182 ] }, "max_3m": { "gradient_pct": 23.550676296247275, "start_distance_m": 863.0, "end_distance_m": 866.0, "midpoint_distance_m": 864.5, "start_elevation_m": 607.7580754695311, "end_elevation_m": 608.4645957584186, "start_xy": [ 819029.7259932808, 6514120.193551652 ], "end_xy": [ 819032.4326321331, 6514121.487424182 ] } }, "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": 0.099, "obstruction_max_height_m": 14.04, "flagged_windows_m": [ 2, 3 ] }, "review": [], "extent": [ "may_start_earlier", "may_continue_beyond_end" ] }, "provenance": { "analysis_version": "0.1.0", "run_manifest": { "manifest_version": "1", "code_git_sha": "076a8e7f889cfb3c2cf6b3de65a6030c7155b1f0", "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-mc8", "road_pbf": "block-batch-fr-mc8.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:af4eae1f5df9e232" }, "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_E818-N6513_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E818-N6514_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E819-N6513_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E819-N6514_0m5@22LHD4NL-2025-08-06.tif" ], "calculated_at": "2026-09-22T12:06:31+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-mc8.osm.pbf", "osm_snapshot": "", "run_id": "fr-mc8", "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": [ "E818-N6513", "E818-N6514", "E819-N6513", "E819-N6514" ], "elevation_blocks": [ "22LHD4NL@2025-08-06" ], "ign_dalles": [ "LHD_FXX_0818_6514_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0818_6515_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0819_6514_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0819_6515_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD4NL" ], "ign_editions": [ "2025-08-06" ], "ign_dsm_edition": { "LHD_FXX_0818_6514_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0818_6515_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0819_6514_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0819_6515_MNT_O_0M50_LAMB93_IGN69": "2025-08-06" }, "climb_origin": "discovered", "structure_own_ways": 2, "carriageway": { "stations": 40, "stations_resolved": 40, "width_median_m": 5.5, "width_p10_m": 4.0, "width_min_m": 3.75, "width_max_m": 10.0, "bounded_share": 0.425, "unbounded_share": 0.575, "confidence_median": 0.0, "width_median_bounded_m": 6.0, "window_m": [ 685.0, 710.0 ], "width_at_max25_m": 4.62, "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": 40, "stations_resolved": 40, "width_median_m": 6.38, "width_p10_m": 1.0, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.775, "unbounded_share": 0.225, "confidence_median": 1.0, "width_median_bounded_m": 5.75, "window_m": [ 685.0, 710.0 ], "width_at_max25_m": 6.5, "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": "Montromant", "county": "Rh\u00f4ne", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }