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"start_xy": [ 668117.8382690036, 6402274.561625595 ], "end_xy": [ 668115.8560899381, 6402274.295230865 ] }, "max_3m": { "gradient_pct": 50.70345467260798, "start_distance_m": 367.0, "end_distance_m": 370.0, "midpoint_distance_m": 368.5, "start_elevation_m": 619.7097297994401, "end_elevation_m": 621.2308334396183, "start_xy": [ 668118.8293585362, 6402274.6948229605 ], "end_xy": [ 668115.8560899381, 6402274.295230865 ] } }, "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). 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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": [ "E667-N6401", "E667-N6402", "E668-N6401", "E668-N6402" ], "elevation_blocks": [ "22LHD3KN@2025-01-29" ], "ign_dalles": [ "LHD_FXX_0667_6402_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0667_6403_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0668_6402_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0668_6403_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD3KN" ], "ign_editions": [ "2025-01-29" ], "ign_dsm_edition": { "LHD_FXX_0667_6402_MNT_O_0M50_LAMB93_IGN69": "2025-01-29", "LHD_FXX_0667_6403_MNT_O_0M50_LAMB93_IGN69": "2025-01-29", "LHD_FXX_0668_6402_MNT_O_0M50_LAMB93_IGN69": "2025-01-29", "LHD_FXX_0668_6403_MNT_O_0M50_LAMB93_IGN69": "2025-01-29" }, "climb_origin": "discovered", "structure_own_ways": 2, "suppression_unstable": [ 5.0 ], "carriageway": { "stations": 47, "stations_resolved": 47, "width_median_m": 5.5, "width_p10_m": 1.9, "width_min_m": 1.0, "width_max_m": 12.0, "bounded_share": 0.213, "unbounded_share": 0.787, "confidence_median": 0.0, "width_median_bounded_m": 2.38, "window_m": [ 366.0, 391.0 ], "width_at_max25_m": 2.75, "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": 47, "stations_resolved": 47, "width_median_m": 6.5, "width_p10_m": 1.65, "width_min_m": 1.0, "width_max_m": 12.0, "bounded_share": 0.574, "unbounded_share": 0.426, "confidence_median": 1.0, "width_median_bounded_m": 2.75, "window_m": [ 366.0, 391.0 ], "width_at_max25_m": 2.75, "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-Hippolyte", "county": "Aveyron", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }