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"start_distance_m": 4814.0, "end_distance_m": 4816.0, "midpoint_distance_m": 4815.0, "start_elevation_m": 673.944694769468, "end_elevation_m": 674.5062175283816, "start_xy": [ 1026032.2456086228, 6326061.336364389 ], "end_xy": [ 1026032.8280644176, 6326063.249671799 ] }, "max_3m": { "gradient_pct": 24.09849314597447, "start_distance_m": 2057.0, "end_distance_m": 2060.0, "midpoint_distance_m": 2058.5, "start_elevation_m": 524.1897999296076, "end_elevation_m": 524.9127547239868, "start_xy": [ 1027120.6924387438, 6324653.341591421 ], "end_xy": [ 1027118.3951354218, 6324651.412239859 ] } }, "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": 0.016, "windows_resited": [ 2.0, 3.0, 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "windows_unresolved": [] }, "placement_suppression": { "masked_fraction": 0.023, "windows_resited": [], "windows_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.025, "windows_resited": [ 2.0, 3.0, 5.0, 10.0, 20.0, 25.0, 50.0 ], "windows_unresolved": [] }, "texture_windows": { "rounds": 2, "windows_masked": [ { "window_m": 5.0, "start_m": 6348.0, "end_m": 6353.0, "raw_pct": 27.66, "reason": "short-step" }, { "window_m": 5.0, "start_m": 7958.0, "end_m": 7963.0, "raw_pct": 22.42, "reason": "short-step" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.079, "obstruction_max_height_m": 22.71, "flagged_windows_m": [ 10, 25, 50 ] }, "excluded_ranges_m": [ [ 1670.0, 1700.0 ], [ 1710.0, 1750.0 ], [ 2599.0, 2613.0 ], [ 2926.0, 2940.0 ], [ 4566.0, 4571.0 ], [ 4837.0, 4852.0 ], [ 5384.0, 5390.0 ], [ 5459.0, 5476.0 ], [ 6346.0, 6355.0 ], [ 6441.0, 6456.0 ], [ 6585.0, 6599.0 ], [ 7956.0, 7965.0 ], [ 8080.0, 8089.0 ] ], "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_E1025-N6325_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1025-N6326_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1025-N6327_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1025-N6328_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1026-N6324_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1026-N6325_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1026-N6326_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1026-N6327_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1026-N6328_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1027-N6324_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1028-N6323_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E1028-N6324_0m5.tif" ], "calculated_at": "2026-09-17T02:12:50+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": [ "E1025-N6325", "E1025-N6326", "E1025-N6327", "E1025-N6328", "E1026-N6324", "E1026-N6325", "E1026-N6326", "E1026-N6327", "E1026-N6328", "E1027-N6324", "E1028-N6323", "E1028-N6324" ], "elevation_blocks": [ "21LHD8RP@2025-03-06" ], "ign_dalles": [ "LHD_FXX_1025_6326_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1025_6327_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1025_6328_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1025_6329_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1026_6325_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1026_6326_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1026_6327_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1026_6328_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1026_6329_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1027_6325_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1028_6324_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_1028_6325_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8RP" ], "ign_editions": [ "2025-03-06" ], "ign_dsm_edition": { "LHD_FXX_1025_6326_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1025_6327_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1025_6328_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1025_6329_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1026_6325_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1026_6326_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1026_6327_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1026_6328_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1026_6329_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1027_6325_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1028_6324_MNT_O_0M50_LAMB93_IGN69": "2025-03-06", "LHD_FXX_1028_6325_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": 337, "stations_resolved": 337, "width_median_m": 4.5, "width_p10_m": 2.75, "width_min_m": 0.5, "width_max_m": 10.75, "bounded_share": 0.807, "unbounded_share": 0.193, "confidence_median": 1.0, "width_median_bounded_m": 4.5, "window_m": [ 4457.0, 4482.0 ], "width_at_max25_m": 2.0, "window_stations": 7, "single_track": true, "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": 337, "stations_resolved": 337, "width_median_m": 4.75, "width_p10_m": 1.15, "width_min_m": 0.0, "width_max_m": 12.0, "bounded_share": 0.947, "unbounded_share": 0.053, "confidence_median": 1.0, "width_median_bounded_m": 4.5, "window_m": [ 4457.0, 4482.0 ], "width_at_max25_m": 1.25, "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": "Villars-sur-Var", "county": "Alpes-Maritimes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }