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noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). 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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": [ "E686-N6530", "E686-N6531", "E687-N6530", "E687-N6531", "E687-N6532", "E688-N6531", "E688-N6532" ], "elevation_blocks": [ "22LHD4LL@2025-07-24" ], "ign_dalles": [ "LHD_FXX_0686_6531_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0686_6532_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0687_6531_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0687_6532_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0687_6533_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0688_6532_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0688_6533_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD4LL" ], "ign_editions": [ "2025-07-24" ], "ign_dsm_edition": { "LHD_FXX_0686_6531_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0686_6532_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0687_6531_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0687_6532_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0687_6533_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0688_6532_MNT_O_0M50_LAMB93_IGN69": "2025-07-24", "LHD_FXX_0688_6533_MNT_O_0M50_LAMB93_IGN69": "2025-07-24" }, "climb_origin": "discovered", "structure_own_ways": 7, "carriageway": { "stations": 161, "stations_resolved": 161, "width_median_m": 5.5, "width_p10_m": 3.25, "width_min_m": 1.0, "width_max_m": 11.0, "bounded_share": 0.28, "unbounded_share": 0.72, "confidence_median": 0.0, "width_median_bounded_m": 5.25, "window_m": [ 444.0, 469.0 ], "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": 161, "stations_resolved": 161, "width_median_m": 6.5, "width_p10_m": 1.0, "width_min_m": 0.0, "width_max_m": 12.0, "bounded_share": 0.646, "unbounded_share": 0.354, "confidence_median": 1.0, "width_median_bounded_m": 4.25, "window_m": [ 444.0, 469.0 ], "width_at_max25_m": 3.75, "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": "Chapdes-Beaufort", "county": "Puy-de-D\u00f4me", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }