{ "ocl_version": "0.1.0", "name": "Chemin du Cr\u00eat du Four", "slug": "chemin-du-cret-du-four", "confidence": "A", "reported_claims": [], "ladder": [ { "window_m": 2.0, "max_gradient_pct": 21.640157351018274, "diagnostic": true, "flags": [], "start_distance_m": 1506.0, "end_distance_m": 1508.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 505.8223729033052, "min_gradient_pct": -1.6271283842769435 }, { "window_m": 3.0, "max_gradient_pct": 21.299198895161453, "diagnostic": true, "flags": [], "start_distance_m": 1506.0, "end_distance_m": 1509.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 506.0285457231397, "min_gradient_pct": -0.05342545167460836 }, { "window_m": 5.0, "max_gradient_pct": 21.24673582140872, "diagnostic": false, "flags": [], "start_distance_m": 1506.0, "end_distance_m": 1511.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 506.4519065473553, "min_gradient_pct": 0.5210677915806627 }, { "window_m": 10.0, "max_gradient_pct": 20.99244338244091, "diagnostic": false, "flags": [], "start_distance_m": 1506.0, "end_distance_m": 1516.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 507.48881409452895, "min_gradient_pct": 0.6591835756017872 }, { "window_m": 20.0, "max_gradient_pct": 20.593233819136856, "diagnostic": false, "flags": [], "start_distance_m": 1502.0, "end_distance_m": 1522.0, "start_elevation_m": 504.59885168291294, "end_elevation_m": 508.7174984467403, "min_gradient_pct": 0.8936056493729438 }, { "window_m": 25.0, "max_gradient_pct": 20.392697817671888, "diagnostic": false, "flags": [], "start_distance_m": 1499.0, "end_distance_m": 1524.0, "start_elevation_m": 503.9982603270621, "end_elevation_m": 509.09643478148007, "min_gradient_pct": 1.0569252606419468 }, { "window_m": 50.0, "max_gradient_pct": 17.539201144351978, "diagnostic": false, "flags": [], "start_distance_m": 1482.0, "end_distance_m": 1532.0, "start_elevation_m": 501.49767619833676, "end_elevation_m": 510.26727677051275, "min_gradient_pct": 2.0542179832848433 }, { "window_m": 100.0, "max_gradient_pct": 15.816294673868754, "diagnostic": false, "flags": [], "start_distance_m": 1082.0, "end_distance_m": 1182.0, "start_elevation_m": 459.8367369821659, "end_elevation_m": 475.65303165603467, "min_gradient_pct": 2.8940780130939743 } ], "shape": { "ascent_concentration": 0.325, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 203.0, "shape_class": "sustained" }, "length_m": 1539.2824105244063, "start_elevation_m": 369.9045098100669, "end_elevation_m": 510.9449304617639, "endpoint_gain_m": 141.040420651697, "overall_gradient_pct": 9.162738408973764, "accumulated_ascent_m": 141.23828737162927, "window_maxima": { "max_5m": { "gradient_pct": 21.24673582140872, "start_distance_m": 1506.0, "end_distance_m": 1511.0, "midpoint_distance_m": 1508.5, "start_elevation_m": 505.38956975628486, "end_elevation_m": 506.4519065473553, "start_xy": [ 815812.3527181438, 6529582.485597982 ], "end_xy": [ 815816.0988051336, 6529579.173977191 ] }, "max_10m": { "gradient_pct": 20.99244338244091, "start_distance_m": 1506.0, "end_distance_m": 1516.0, "midpoint_distance_m": 1511.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 507.48881409452895, "start_xy": [ 815812.3527181438, 6529582.485597982 ], "end_xy": [ 815819.8448921234, 6529575.8623564 ] }, "max_20m": { "gradient_pct": 20.593233819136856, "start_distance_m": 1502.0, "end_distance_m": 1522.0, "midpoint_distance_m": 1512.0, "start_elevation_m": 504.59885168291294, "end_elevation_m": 508.7174984467403, "start_xy": [ 815809.2035519972, 6529584.878275262 ], "end_xy": [ 815824.3401965111, 6529571.88841145 ] }, "max_25m": { "gradient_pct": 20.392697817671888, "start_distance_m": 1499.0, "end_distance_m": 1524.0, "midpoint_distance_m": 1511.5, "start_elevation_m": 503.9982603270621, "end_elevation_m": 509.09643478148007, "start_xy": [ 815806.3826621654, 6529585.899343603 ], "end_xy": [ 815825.838631307, 6529570.563763133 ] }, "max_50m": { "gradient_pct": 17.539201144351978, "start_distance_m": 1482.0, "end_distance_m": 1532.0, "midpoint_distance_m": 1507.0, "start_elevation_m": 501.49767619833676, "end_elevation_m": 510.26727677051275, "start_xy": [ 815790.446043774, 6529584.790009928 ], "end_xy": [ 815832.4712705951, 6529566.178507406 ] }, "max_100m": { "gradient_pct": 15.816294673868754, "start_distance_m": 1082.0, "end_distance_m": 1182.0, "midpoint_distance_m": 1132.0, "start_elevation_m": 459.8367369821659, "end_elevation_m": 475.65303165603467, "start_xy": [ 815709.1009073213, 6529376.278082392 ], "end_xy": [ 815774.4145692447, 6529301.039835006 ] } }, "window_minima": { "min_5m": { "gradient_pct": 0.5210677915806627, "start_distance_m": 0.0, "end_distance_m": 5.0, "midpoint_distance_m": 2.5, "start_elevation_m": 369.9045098100669, "end_elevation_m": 369.9305631996459, "start_xy": [ 815012.817, 6529949.094 ], "end_xy": [ 815017.7104927128, 6529950.120513063 ] }, "min_10m": { "gradient_pct": 0.6591835756017872, "start_distance_m": 0.0, "end_distance_m": 10.0, "midpoint_distance_m": 5.0, "start_elevation_m": 369.9045098100669, "end_elevation_m": 369.97042816762706, "start_xy": [ 815012.817, 6529949.094 ], "end_xy": [ 815022.6039854257, 6529951.147026127 ] }, "min_20m": { "gradient_pct": 0.8936056493729438, "start_distance_m": 0.0, "end_distance_m": 20.0, "midpoint_distance_m": 10.0, "start_elevation_m": 369.9045098100669, "end_elevation_m": 370.0832309399415, "start_xy": [ 815012.817, 6529949.094 ], "end_xy": [ 815032.3918890596, 6529953.195624714 ] }, "min_25m": { "gradient_pct": 1.0569252606419468, "start_distance_m": 0.0, "end_distance_m": 25.0, "midpoint_distance_m": 12.5, "start_elevation_m": 369.9045098100669, "end_elevation_m": 370.16874112522737, "start_xy": [ 815012.817, 6529949.094 ], "end_xy": [ 815037.2900236952, 6529954.199754731 ] }, "min_50m": { "gradient_pct": 2.0542179832848433, "start_distance_m": 0.0, "end_distance_m": 50.0, "midpoint_distance_m": 25.0, "start_elevation_m": 369.9045098100669, "end_elevation_m": 370.9316188017093, "start_xy": [ 815012.817, 6529949.094 ], "end_xy": [ 815061.7522954987, 6529959.323106787 ] }, "min_100m": { "gradient_pct": 2.8940780130939743, "start_distance_m": 687.0, "end_distance_m": 787.0, "midpoint_distance_m": 737.0, "start_elevation_m": 431.8016873439795, "end_elevation_m": 434.69576535707347, "start_xy": [ 815505.1986412888, 6529654.365005977 ], "end_xy": [ 815503.9516958428, 6529554.69259955 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 21.640157351018274, "start_distance_m": 1506.0, "end_distance_m": 1508.0, "midpoint_distance_m": 1507.0, "start_elevation_m": 505.38956975628486, "end_elevation_m": 505.8223729033052, "start_xy": [ 815812.3527181438, 6529582.485597982 ], "end_xy": [ 815813.8511529397, 6529581.160949666 ] }, "max_3m": { "gradient_pct": 21.299198895161453, "start_distance_m": 1506.0, "end_distance_m": 1509.0, "midpoint_distance_m": 1507.5, "start_elevation_m": 505.38956975628486, "end_elevation_m": 506.0285457231397, "start_xy": [ 815812.3527181438, 6529582.485597982 ], "end_xy": [ 815814.6003703377, 6529580.498625508 ] } }, "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": 0.008, "obstruction_max_height_m": 6.81, "flagged_windows_m": [] }, "review": [], "extent": [ "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_E814-N6529_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E814-N6530_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E815-N6529_0m5@22LHD4NL-2025-08-06.tif", "data/cache/fr/ign-lidarhd_dtm_E815-N6530_0m5@22LHD4NL-2025-08-06.tif" ], "calculated_at": "2026-09-22T14:45:46+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": [ "E814-N6529", "E814-N6530", "E815-N6529", "E815-N6530" ], "elevation_blocks": [ "22LHD4NL@2025-08-06" ], "ign_dalles": [ "LHD_FXX_0814_6530_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0814_6531_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0815_6530_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0815_6531_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD4NL" ], "ign_editions": [ "2025-08-06" ], "ign_dsm_edition": { "LHD_FXX_0814_6530_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0814_6531_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0815_6530_MNT_O_0M50_LAMB93_IGN69": "2025-08-06", "LHD_FXX_0815_6531_MNT_O_0M50_LAMB93_IGN69": "2025-08-06" }, "climb_origin": "discovered", "structure_own_ways": 3, "carriageway": { "stations": 68, "stations_resolved": 68, "width_median_m": 4.12, "width_p10_m": 2.75, "width_min_m": 1.0, "width_max_m": 10.25, "bounded_share": 0.324, "unbounded_share": 0.676, "confidence_median": 0.0, "width_median_bounded_m": 3.62, "window_m": [ 1499.0, 1524.0 ], "width_at_max25_m": 5.25, "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": 68, "stations_resolved": 68, "width_median_m": 8.25, "width_p10_m": 4.92, "width_min_m": 3.5, "width_max_m": 12.0, "bounded_share": 0.559, "unbounded_share": 0.441, "confidence_median": 0.905, "width_median_bounded_m": 6.75, "window_m": [ 1499.0, 1524.0 ], "width_at_max25_m": 8.5, "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-Forgeux", "county": "Rh\u00f4ne", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }