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"end_distance_m": 5545.0, "midpoint_distance_m": 5532.5, "start_elevation_m": 1968.6319638964314, "end_elevation_m": 1965.1597945574215, "start_xy": [ 1005102.4786489794, 6362285.896075585 ], "end_xy": [ 1005083.697183426, 6362292.471266509 ] }, "min_50m": { "gradient_pct": -5.826399677663176, "start_distance_m": 7134.0, "end_distance_m": 7184.0, "midpoint_distance_m": 7159.0, "start_elevation_m": 2109.1068159203037, "end_elevation_m": 2106.193616081472, "start_xy": [ 1004363.5584063816, 6363091.440846578 ], "end_xy": [ 1004342.508388855, 6363136.6622091625 ] }, "min_100m": { "gradient_pct": -3.3103816514180835, "start_distance_m": 7091.0, "end_distance_m": 7191.0, "midpoint_distance_m": 7141.0, "start_elevation_m": 2109.3339223962676, "end_elevation_m": 2106.0235407448495, "start_xy": [ 1004363.0166952418, 6363048.633097514 ], "end_xy": [ 1004339.4560847433, 6363142.961688476 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 30.5859466648144, "start_distance_m": 6667.0, "end_distance_m": 6669.0, "midpoint_distance_m": 6668.0, "start_elevation_m": 2072.0653351449337, "end_elevation_m": 2072.67705407823, "start_xy": [ 1004331.6939280708, 6362702.23075239 ], "end_xy": [ 1004330.2120073595, 6362700.887654848 ] }, "max_3m": { "gradient_pct": 22.861558096822893, "start_distance_m": 6666.0, "end_distance_m": 6669.0, "midpoint_distance_m": 6667.5, "start_elevation_m": 2071.9912073353253, "end_elevation_m": 2072.67705407823, "start_xy": [ 1004332.4348884264, 6362702.902301161 ], "end_xy": [ 1004330.2120073595, 6362700.887654848 ] } }, "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": 0.002, "windows_resited": [ 2.0, 3.0, 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "windows_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.006, "windows_resited": [ 5.0, 10.0, 20.0, 25.0 ], "windows_unresolved": [] }, "texture_windows": { "rounds": 2, "windows_masked": [ { "window_m": 5.0, "start_m": 6587.0, "end_m": 6592.0, "raw_pct": 36.25, "reason": "short-step" }, { "window_m": 25.0, "start_m": 9937.0, "end_m": 9962.0, "raw_pct": 16.81, "reason": "hump" }, { "window_m": 20.0, "start_m": 9938.0, "end_m": 9958.0, "raw_pct": 17.29, "reason": "hump" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.072, "obstruction_max_height_m": 22.56, "flagged_windows_m": [ 2, 3, 5 ] }, "excluded_ranges_m": [ [ 5534.0, 5557.0 ], [ 6585.0, 6594.0 ], [ 9935.0, 9964.0 ] ], "review": [], "extent": [ "descends_at_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_E1002-N6364_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1003-N6363_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1003-N6364_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1004-N6362_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1004-N6363_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1005-N6361_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1005-N6362_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1006-N6361_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1006-N6362_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1007-N6361_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1007-N6362_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1008-N6361_0m5.tif" ], "calculated_at": "2026-09-17T07:10:12+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps4-cols.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps4-cols", "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": [ "E1002-N6364", "E1003-N6363", "E1003-N6364", "E1004-N6362", "E1004-N6363", "E1005-N6361", "E1005-N6362", "E1006-N6361", "E1006-N6362", "E1007-N6361", "E1007-N6362", "E1008-N6361" ], "elevation_blocks": [ "21LHD8RO@2025-04-02" ], "ign_dalles": [ "LHD_FXX_1002_6365_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1003_6364_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1003_6365_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1004_6363_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1004_6364_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1005_6362_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1005_6363_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1006_6362_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1006_6363_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1007_6362_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1007_6363_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1008_6362_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8RO" ], "ign_editions": [ "2025-04-02" ], "ign_dsm_edition": { "LHD_FXX_1002_6365_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1003_6364_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1003_6365_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1004_6363_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1004_6364_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1005_6362_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1005_6363_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1006_6362_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1006_6363_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1007_6362_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1007_6363_MNT_O_0M50_LAMB93_IGN69": "2025-04-02", "LHD_FXX_1008_6362_MNT_O_0M50_LAMB93_IGN69": "2025-04-02" }, "climb_origin": "named-pass", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 436, "stations_resolved": 436, "width_median_m": 5.5, "width_p10_m": 4.25, "width_min_m": 1.25, "width_max_m": 12.0, "bounded_share": 0.61, "unbounded_share": 0.39, "confidence_median": 0.621, "width_median_bounded_m": 5.5, "window_m": [ 8453.0, 8478.0 ], "width_at_max25_m": 5.0, "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": 436, "stations_resolved": 436, "width_median_m": 6.25, "width_p10_m": 1.5, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.835, "unbounded_share": 0.165, "confidence_median": 1.0, "width_median_bounded_m": 5.75, "window_m": [ 8453.0, 8478.0 ], "width_at_max25_m": 5.75, "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-Dalmas-le-Selvage", "county": "Alpes-Maritimes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }