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10.0, "midpoint_distance_m": 5.0, "start_elevation_m": 140.87205796532078, "end_elevation_m": 141.59609825867344, "start_xy": [ 1060067.826, 6308903.656 ], "end_xy": [ 1060072.164314284, 6308912.519880844 ] }, "min_20m": { "gradient_pct": 10.629842641076976, "start_distance_m": 82.0, "end_distance_m": 102.0, "midpoint_distance_m": 92.0, "start_elevation_m": 155.71260993680468, "end_elevation_m": 157.83857846502008, "start_xy": [ 1060050.8166154905, 6308974.178123307 ], "end_xy": [ 1060035.683391184, 6308987.209232779 ] }, "min_25m": { "gradient_pct": 11.147493863353134, "start_distance_m": 82.0, "end_distance_m": 107.0, "midpoint_distance_m": 94.5, "start_elevation_m": 155.71260993680468, "end_elevation_m": 158.49948340264297, "start_xy": [ 1060050.8166154905, 6308974.178123307 ], "end_xy": [ 1060032.1189474121, 6308990.715618468 ] }, "min_50m": { "gradient_pct": 12.844272222303402, "start_distance_m": 66.0, "end_distance_m": 116.0, "midpoint_distance_m": 91.0, "start_elevation_m": 153.30422963592505, "end_elevation_m": 159.72636574707676, "start_xy": [ 1060056.3593442233, 6308959.389377389 ], "end_xy": [ 1060025.7029486226, 6308997.027112707 ] }, "min_100m": { "gradient_pct": 13.499615908234091, "start_distance_m": 67.0, "end_distance_m": 167.0, "midpoint_distance_m": 117.0, "start_elevation_m": 153.46265964326173, "end_elevation_m": 166.96227555149582, "start_xy": [ 1060056.1047392979, 6308960.356422544 ], "end_xy": [ 1059999.283171056, 6309039.994190118 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 28.698067855597742, "start_distance_m": 37.0, "end_distance_m": 39.0, "midpoint_distance_m": 38.0, "start_elevation_m": 147.67736863367614, "end_elevation_m": 148.2513299907881, "start_xy": [ 1060058.3339537254, 6308931.911347296 ], "end_xy": [ 1060058.3422301882, 6308933.911330171 ] }, "max_3m": { "gradient_pct": 27.684326244159745, "start_distance_m": 36.0, "end_distance_m": 39.0, "midpoint_distance_m": 37.5, "start_elevation_m": 147.4208002034633, "end_elevation_m": 148.2513299907881, "start_xy": [ 1060058.3298154941, 6308930.911355859 ], "end_xy": [ 1060058.3422301882, 6308933.911330171 ] } }, "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": 0.05, "obstruction_max_height_m": 6.65, "flagged_windows_m": [] }, "review": [], "extent": [ "may_start_earlier", "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_E1059-N6308_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1059-N6309_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1060-N6308_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1060-N6309_0m5.tif" ], "calculated_at": "2026-09-17T02:49:12+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps4.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps4", "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": [ "E1059-N6308", "E1059-N6309", "E1060-N6308", "E1060-N6309" ], "elevation_blocks": [ "21LHD8SP@2025-06-20" ], "ign_dalles": [ "LHD_FXX_1059_6309_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1059_6310_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1060_6309_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1060_6310_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8SP" ], "ign_editions": [ "2025-06-20" ], "ign_dsm_edition": { "LHD_FXX_1059_6309_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1059_6310_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1060_6309_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1060_6310_MNT_O_0M50_LAMB93_IGN69": "2025-06-20" }, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 16, "stations_resolved": 16, "width_median_m": 3.88, "width_p10_m": 3.0, "width_min_m": 2.75, "width_max_m": 11.25, "bounded_share": 0.5, "unbounded_share": 0.5, "confidence_median": 0.253, "width_median_bounded_m": 3.62, "window_m": [ 17.0, 42.0 ], "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": 16, "stations_resolved": 16, "width_median_m": 3.62, "width_p10_m": 1.12, "width_min_m": 1.0, "width_max_m": 8.75, "bounded_share": 0.812, "unbounded_share": 0.188, "confidence_median": 1.0, "width_median_bounded_m": 3.25, "window_m": [ 17.0, 42.0 ], "width_at_max25_m": 3.25, "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": "Sainte-Agn\u00e8s", "county": "Alpes-Maritimes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }