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"start_distance_m": 227.0, "end_distance_m": 229.0, "midpoint_distance_m": 228.0, "start_elevation_m": 1017.4560992801253, "end_elevation_m": 1017.9825641285872, "start_xy": [ 981660.1208715816, 6417167.883317341 ], "end_xy": [ 981661.9625057703, 6417168.663306774 ] }, "max_3m": { "gradient_pct": 25.30443567235731, "start_distance_m": 226.0, "end_distance_m": 229.0, "midpoint_distance_m": 227.5, "start_elevation_m": 1017.2234310584165, "end_elevation_m": 1017.9825641285872, "start_xy": [ 981659.2000544873, 6417167.493322624 ], "end_xy": [ 981661.9625057703, 6417168.663306774 ] } }, "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": 0.026, "windows_resited": [ 2.0, 3.0, 5.0 ], "windows_unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.056, "obstruction_max_height_m": 9.08, "flagged_windows_m": [] }, "excluded_ranges_m": [ [ 121.0, 126.0 ] ], "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_E981-N6416_0m5.tif", "data/cache/fr/ign-lidarhd_dtm_E981-N6417_0m5.tif" ], "calculated_at": "2026-09-17T02:37:07+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": [ "E981-N6416", "E981-N6417" ], "elevation_blocks": [ "21LHD8QN@2025-02-20" ], "ign_dalles": [ "LHD_FXX_0981_6417_MNT_O_0M50_LAMB93_IGN69", "LHD_FXX_0981_6418_MNT_O_0M50_LAMB93_IGN69" ], "ign_missions": [ "21LHD8QN" ], "ign_editions": [ "2025-02-20" ], "ign_dsm_edition": { "LHD_FXX_0981_6417_MNT_O_0M50_LAMB93_IGN69": "2025-02-20", "LHD_FXX_0981_6418_MNT_O_0M50_LAMB93_IGN69": "2025-02-20" }, "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "carriageway": { "stations": 16, "stations_resolved": 16, "width_median_m": 5.12, "width_p10_m": 2.12, "width_min_m": 0.5, "width_max_m": 10.5, "bounded_share": 0.125, "unbounded_share": 0.875, "confidence_median": 0.0, "width_median_bounded_m": 3.88, "window_m": [ 204.0, 229.0 ], "width_at_max25_m": 5.25, "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": 16, "stations_resolved": 16, "width_median_m": 5.0, "width_p10_m": 1.62, "width_min_m": 1.0, "width_max_m": 11.75, "bounded_share": 0.688, "unbounded_share": 0.312, "confidence_median": 1.0, "width_median_bounded_m": 3.0, "window_m": [ 204.0, 229.0 ], "width_at_max25_m": 2.25, "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": "L'Argenti\u00e8re-la-Bess\u00e9e", "county": "Hautes-Alpes", "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)" } }