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299.129786697477, "start_xy": [ 1031957.8509675944, 6328179.823642305 ], "end_xy": [ 1031948.7869393572, 6328196.643692559 ] }, "min_25m": { "gradient_pct": 0.9084259832450243, "start_distance_m": 170.0, "end_distance_m": 195.0, "midpoint_distance_m": 182.5, "start_elevation_m": 298.90268020166576, "end_elevation_m": 299.129786697477, "start_xy": [ 1031960.0986825215, 6328175.357348807 ], "end_xy": [ 1031948.7869393572, 6328196.643692559 ] }, "min_50m": { "gradient_pct": 2.335388911669156, "start_distance_m": 145.0, "end_distance_m": 195.0, "midpoint_distance_m": 170.0, "start_elevation_m": 297.96209224164244, "end_elevation_m": 299.129786697477, "start_xy": [ 1031971.5007282894, 6328153.117385251 ], "end_xy": [ 1031948.7869393572, 6328196.643692559 ] }, "min_100m": { "gradient_pct": 3.2375708843882194, "start_distance_m": 6767.0, "end_distance_m": 6867.0, "midpoint_distance_m": 6817.0, "start_elevation_m": 804.7560335997283, "end_elevation_m": 807.9936044841165, "start_xy": [ 1030950.9979118934, 6328989.650783158 ], "end_xy": [ 1030869.720646367, 6329045.605151254 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 26.613045416007708, "start_distance_m": 4291.0, "end_distance_m": 4293.0, "midpoint_distance_m": 4292.0, "start_elevation_m": 613.0200893301597, "end_elevation_m": 613.5523502384799, "start_xy": [ 1031448.1225965131, 6328374.726927218 ], "end_xy": [ 1031447.3590258162, 6328376.575429258 ] }, "max_3m": { "gradient_pct": 20.6367281772638, "start_distance_m": 4291.0, "end_distance_m": 4294.0, "midpoint_distance_m": 4292.5, "start_elevation_m": 613.0200893301597, "end_elevation_m": 613.6391911754777, "start_xy": [ 1031448.1225965131, 6328374.726927218 ], "end_xy": [ 1031446.9772404677, 6328377.499680278 ] } }, "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": 0.001, "windows_resited": [ 10.0 ], "windows_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.002, "windows_resited": [ 2.0, 3.0, 5.0, 10.0 ], "windows_unresolved": [] }, "texture_windows": { "rounds": 1, "windows_masked": [ { "window_m": 5.0, "start_m": 6366.0, "end_m": 6371.0, "raw_pct": 27.82, "reason": "short-step" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.055, "obstruction_max_height_m": 23.87, "flagged_windows_m": [] }, "excluded_ranges_m": [ [ 6364.0, 6373.0 ], [ 7776.0, 7781.0 ] ], "review": [], "extent": [] }, "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_E1030-N6328_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1030-N6329_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1031-N6327_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1031-N6328_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1031-N6329_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1032-N6327_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1032-N6328_0m5.tif" ], "calculated_at": "2026-09-17T02:13:14+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": [ "E1030-N6328", "E1030-N6329", "E1031-N6327", "E1031-N6328", "E1031-N6329", "E1032-N6327", "E1032-N6328" ], "elevation_blocks": [ "21LHD8RP@2025-03-06" ], "ign_dalles": [ "LHD_FXX_1030_6329_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1030_6330_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1031_6328_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1031_6329_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1031_6330_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1032_6328_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1032_6329_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8RP" ], "ign_editions": [ "2025-03-06" ], "ign_dsm_edition": { "LHD_FXX_1030_6329_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1030_6330_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1031_6328_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1031_6329_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1031_6330_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1032_6328_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1032_6329_MNT_O_0M50_LAMB93_IGN69": "2025-03-06" }, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 330, "stations_resolved": 330, "width_median_m": 5.0, "width_p10_m": 3.5, "width_min_m": 0.5, "width_max_m": 10.5, "bounded_share": 0.797, "unbounded_share": 0.203, "confidence_median": 0.998, "width_median_bounded_m": 5.0, "window_m": [ 7443.0, 7468.0 ], "width_at_max25_m": 3.25, "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": 330, "stations_resolved": 330, "width_median_m": 5.5, "width_p10_m": 2.47, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.903, "unbounded_share": 0.097, "confidence_median": 1.0, "width_median_bounded_m": 5.25, "window_m": [ 7443.0, 7468.0 ], "width_at_max25_m": 3.5, "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": "Bairols", "county": "Alpes-Maritimes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }