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248.74503731480394, "start_xy": [ 835881.2468886757, 6397223.617247624 ], "end_xy": [ 835893.8063175642, 6397245.180738431 ] }, "min_50m": { "gradient_pct": 0.09771240076327103, "start_distance_m": 5.0, "end_distance_m": 55.0, "midpoint_distance_m": 30.0, "start_elevation_m": 248.69150880124903, "end_elevation_m": 248.74036500163066, "start_xy": [ 835865.126429082, 6397205.837180625 ], "end_xy": [ 835894.2945098091, 6397246.053474549 ] }, "min_100m": { "gradient_pct": 1.7782157047407736, "start_distance_m": 2.0, "end_distance_m": 102.0, "midpoint_distance_m": 52.0, "start_elevation_m": 248.6754950550315, "end_elevation_m": 250.45371075977226, "start_xy": [ 835863.1113716329, 6397203.61467225 ], "end_xy": [ 835926.3873984864, 6397279.261994892 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 26.330927637820878, "start_distance_m": 190.0, "end_distance_m": 192.0, "midpoint_distance_m": 191.0, "start_elevation_m": 258.2666770133518, "end_elevation_m": 258.7932955661082, "start_xy": [ 835998.3475397598, 6397286.423051204 ], "end_xy": [ 836000.0099533267, 6397285.3111244375 ] }, "max_3m": { "gradient_pct": 25.077057749077387, "start_distance_m": 191.0, "end_distance_m": 194.0, "midpoint_distance_m": 192.5, "start_elevation_m": 258.4823707245577, "end_elevation_m": 259.23468245703003, "start_xy": [ 835999.1787465432, 6397285.867087821 ], "end_xy": [ 836001.6723668934, 6397284.199197671 ] } }, "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": { "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.36, "obstruction_max_height_m": 13.97, "flagged_windows_m": [ 2, 3, 5, 10, 20, 25, 50, 100 ] }, "review": [], "extent": [] }, "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_E835-N6397_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E836-N6397_0m5.tif" ], "calculated_at": "2026-09-17T03:41:58+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps1.osm.pbf", "osm_snapshot": "", "run_id": "fr-alps1", "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": [ "E835-N6397", "E836-N6397" ], "elevation_blocks": [ "22LHD5NN@2025-06-04", "22LHD5ON@2025-08-13" ], "ign_dalles": [ "LHD_FXX_0835_6398_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0836_6398_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "22LHD5NN", "22LHD5ON" ], "ign_editions": [ "2025-06-04", "2025-08-13" ], "ign_dsm_edition": { "LHD_FXX_0835_6398_MNT_O_0M50_LAMB93_IGN69": "2025-06-04", "LHD_FXX_0836_6398_MNT_O_0M50_LAMB93_IGN69": "2025-08-13" }, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 19, "stations_resolved": 19, "width_median_m": 6.0, "width_p10_m": 4.4, "width_min_m": 3.25, "width_max_m": 9.5, "bounded_share": 0.053, "unbounded_share": 0.947, "confidence_median": 0.0, "width_median_bounded_m": 4.75, "window_m": [ 255.0, 280.0 ], "width_at_max25_m": 6.88, "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": 19, "stations_resolved": 19, "width_median_m": 5.5, "width_p10_m": 1.2, "width_min_m": 0.5, "width_max_m": 10.25, "bounded_share": 0.842, "unbounded_share": 0.158, "confidence_median": 1.0, "width_median_bounded_m": 4.5, "window_m": [ 255.0, 280.0 ], "width_at_max25_m": 6.25, "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": "Saint-Vincent-de-Barr\u00e8s", "county": "Ard\u00e8che", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }