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"gradient_pct": 5.428157230028319, "start_distance_m": 735.0, "end_distance_m": 785.0, "midpoint_distance_m": 760.0, "start_elevation_m": 1469.8909876549335, "end_elevation_m": 1472.6050662699477, "start_xy": [ 956099.32639565, 6461216.331376801 ], "end_xy": [ 956063.3635669667, 6461251.002565269 ] }, "min_100m": { "gradient_pct": 6.866007607901793, "start_distance_m": 716.0, "end_distance_m": 816.0, "midpoint_distance_m": 766.0, "start_elevation_m": 1468.3157436985753, "end_elevation_m": 1475.181751306477, "start_xy": [ 956113.0915805942, 6461203.294238569 ], "end_xy": [ 956034.0508685982, 6461251.057537416 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 27.015089872111275, "start_distance_m": 1003.0, "end_distance_m": 1005.0, "midpoint_distance_m": 1004.0, "start_elevation_m": 1499.6042778883495, "end_elevation_m": 1500.1445796857918, "start_xy": [ 955892.29730834, 6461142.713743325 ], "end_xy": [ 955890.8561393815, 6461141.327009019 ] }, "max_3m": { "gradient_pct": 24.08002538913176, "start_distance_m": 1003.0, "end_distance_m": 1006.0, "midpoint_distance_m": 1004.5, "start_elevation_m": 1499.6042778883495, "end_elevation_m": 1500.3266786500235, "start_xy": [ 955892.29730834, 6461142.713743325 ], "end_xy": [ 955890.1355549024, 6461140.633641867 ] } }, "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": 0.008, "windows_resited": [], "windows_unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.011, "obstruction_max_height_m": 7.75, "flagged_windows_m": [ 2, 3 ] }, "excluded_ranges_m": [ [ 0.0, 20.0 ] ], "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_E955-N6459_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E955-N6460_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E955-N6461_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E956-N6460_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E956-N6461_0m5.tif" ], "calculated_at": "2026-09-17T04:16:46+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps3.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps3", "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": [ "E955-N6459", "E955-N6460", "E955-N6461", "E956-N6460", "E956-N6461" ], "elevation_blocks": [ "21LHD6QM@2025-02-20" ], "ign_dalles": [ "LHD_FXX_0955_6460_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0955_6461_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0955_6462_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0956_6461_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0956_6462_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD6QM" ], "ign_editions": [ "2025-02-20" ], "ign_dsm_edition": { "LHD_FXX_0955_6460_MNT_O_0M50_LAMB93_IGN69": "2025-02-20", "LHD_FXX_0955_6461_MNT_O_0M50_LAMB93_IGN69": "2025-02-20", "LHD_FXX_0955_6462_MNT_O_0M50_LAMB93_IGN69": "2025-02-20", "LHD_FXX_0956_6461_MNT_O_0M50_LAMB93_IGN69": "2025-02-20", "LHD_FXX_0956_6462_MNT_O_0M50_LAMB93_IGN69": "2025-02-20" }, "climb_origin": "discovered", "structure_own_ways": 5, "structure_mask_ranges_m": [ [ 0.0, 15.0 ] ], "carriageway": { "stations": 107, "stations_resolved": 107, "width_median_m": 5.25, "width_p10_m": 3.5, "width_min_m": 1.75, "width_max_m": 9.25, "bounded_share": 0.402, "unbounded_share": 0.598, "confidence_median": 0.0, "width_median_bounded_m": 5.75, "window_m": [ 1315.0, 1340.0 ], "width_at_max25_m": 5.25, "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": 107, "stations_resolved": 107, "width_median_m": 7.75, "width_p10_m": 4.65, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.729, "unbounded_share": 0.271, "confidence_median": 1.0, "width_median_bounded_m": 7.0, "window_m": [ 1315.0, 1340.0 ], "width_at_max25_m": 4.62, "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": "Saint-Jean-d'Arves", "county": "Savoie", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }