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130.14214324315986, "end_elevation_m": 130.41682495049616, "start_xy": [ 1042772.582, 6301806.268 ], "end_xy": [ 1042789.3765016887, 6301811.89739614 ] }, "min_25m": { "gradient_pct": 2.087047390122166, "start_distance_m": 0.0, "end_distance_m": 25.0, "midpoint_distance_m": 12.5, "start_elevation_m": 130.14214324315986, "end_elevation_m": 130.6639050906904, "start_xy": [ 1042772.582, 6301806.268 ], "end_xy": [ 1042794.1048055852, 6301810.313555569 ] }, "min_50m": { "gradient_pct": 2.8687998433572943, "start_distance_m": 814.0, "end_distance_m": 864.0, "midpoint_distance_m": 839.0, "start_elevation_m": 189.90781083981787, "end_elevation_m": 191.34221076149652, "start_xy": [ 1042819.8779691565, 6302058.7704457585 ], "end_xy": [ 1042795.9865857713, 6302102.692605467 ] }, "min_100m": { "gradient_pct": 3.2285319368997705, "start_distance_m": 793.0, "end_distance_m": 893.0, "midpoint_distance_m": 843.0, "start_elevation_m": 189.12510668700443, "end_elevation_m": 192.3536386239042, "start_xy": [ 1042829.6306737843, 6302040.173316152 ], "end_xy": [ 1042780.350601733, 6302127.076511896 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 42.90547869158985, "start_distance_m": 1360.0, "end_distance_m": 1362.0, "midpoint_distance_m": 1361.0, "start_elevation_m": 252.59635488561028, "end_elevation_m": 253.45446445944208, "start_xy": [ 1042468.8888113349, 6302401.305263921 ], "end_xy": [ 1042468.3666262256, 6302403.235891464 ] }, "max_3m": { "gradient_pct": 37.18226820590568, "start_distance_m": 1360.0, "end_distance_m": 1363.0, "midpoint_distance_m": 1361.5, "start_elevation_m": 252.59635488561028, "end_elevation_m": 253.71182293178745, "start_xy": [ 1042468.8888113349, 6302401.305263921 ], "end_xy": [ 1042468.105533671, 6302404.201205236 ] } }, "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": 0.003, "windows_resited": [ 2.0 ], "windows_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.009, "windows_resited": [ 2.0, 3.0, 5.0 ], "windows_unresolved": [] }, "texture_windows": { "rounds": 1, "windows_masked": [ { "window_m": 5.0, "start_m": 1323.0, "end_m": 1328.0, "raw_pct": 33.93, "reason": "hump+short-step" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.322, "obstruction_max_height_m": 29.27, "flagged_windows_m": [ 2, 3, 5, 10, 20, 25, 50, 100 ] }, "excluded_ranges_m": [ [ 1321.0, 1330.0 ], [ 1472.0, 1475.0 ] ], "review": [], "extent": [ "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_E1042-N6301_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1042-N6302_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1043-N6301_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1043-N6302_0m5.tif" ], "calculated_at": "2026-09-17T03:03:29+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": [ "E1042-N6301", "E1042-N6302", "E1043-N6301", "E1043-N6302" ], "elevation_blocks": [ "21LHD8SP@2025-06-20" ], "ign_dalles": [ "LHD_FXX_1042_6302_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1042_6303_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1043_6302_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1043_6303_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8SP" ], "ign_editions": [ "2025-06-20" ], "ign_dsm_edition": { "LHD_FXX_1042_6302_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1042_6303_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1043_6302_MNT_O_0M50_LAMB93_IGN69": "2025-06-20", "LHD_FXX_1043_6303_MNT_O_0M50_LAMB93_IGN69": "2025-06-20" }, "route_cut_m": 1475.7, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 65, "stations_resolved": 65, "width_median_m": 5.0, "width_p10_m": 1.65, "width_min_m": 1.0, "width_max_m": 10.75, "bounded_share": 0.431, "unbounded_share": 0.569, "confidence_median": 0.0, "width_median_bounded_m": 4.5, "window_m": [ 1190.0, 1215.0 ], "width_at_max25_m": 1.12, "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": 65, "stations_resolved": 65, "width_median_m": 2.75, "width_p10_m": 0.6, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.938, "unbounded_share": 0.062, "confidence_median": 1.0, "width_median_bounded_m": 2.5, "window_m": [ 1190.0, 1215.0 ], "width_at_max25_m": 2.25, "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": "Nice", "county": "Alpes-Maritimes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }