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Hourquette d'Ancizan from Payolle

9908.8 m · net rise 475.6 m · total ascent 565.5 m · overall 4.8% · evidence quality B (good) · Ancizan · Hautes-Pyrénées ·

Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 100 m.

Not yet matched against documented climbs — the measurement stands on its own.

Gradient ladder what do windows mean?

WindowMaximumLocated at
2 m (diagnostic)≈29%5759–5761 munder overhead cover terrain reads 164.0% at 6919–6921 m across a structure — excluded
3 m (diagnostic)≈25%5759–5762 munder overhead cover terrain reads 149.5% at 6919–6922 m across a structure — excluded
5 m≈18%5758–5763 munder overhead cover terrain reads 89.4% at 6919–6924 m across a structure — excluded
10 m≈14%2953–2963 munder overhead cover terrain reads 44.7% at 6919–6929 m across a structure — excluded
20 m≈12.8%2947–2967 munder overhead cover terrain reads 22.6% at 6919–6939 m across a structure — excluded
25 m≈12.2%2942–2967 munder overhead cover terrain reads 18.1% at 6919–6944 m across a structure — excluded
50 m≈11.8%2102–2152 munder overhead cover terrain reads 12.4% at 2869–2919 m across a structure — excluded
100 m≈10.9%9151–9251 munder overhead cover terrain reads 11.7% at 2869–2969 m across a structure — excluded

Map

Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap

This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.

Surface: paved throughout, according to BD TOPO®, IGN's national topographic database.

Measured, not vetted. This page records what the laser record shows about the road's shape — nothing more. Nobody has necessarily ridden or inspected this road for the survey, and a page here is not a recommendation and no guarantee that the road is open, surfaced, rideable or safe. Gates, private sections, missing rights of way and hazards do not show up in elevation data. Check access and conditions on the ground and make your own judgment.

Ridden it, or know better? Submit data for this climb no account needed ·

Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%

  © OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap · aerial imagery © IGN, BD ORTHO® (Licence Ouverte Etalab 2.0)

Hourquette d'Ancizan from Payolle LiDAR hillshade map with contours

Profile

The map, profile and gradient chart share one position — move your pointer over them and the marker follows. Colors are the gradient bands; the shaded span is the steepest 25 m. Any 25 m figure is good to about a point either way (why).

Hourquette d'Ancizan from Payolle elevation profile
Hourquette d'Ancizan from Payolle rolling gradient profile
 

Measurement card

ElevationIGN LiDAR HD MNT 0.5 m — LiDAR HD — MNT (sol) et MNS (surface), 0,50 m (Institut national de l'information géographique et forestière), RGF93 / Lambert-93 EPSG:2154, altitudes IGN69
Resolution / CRS0.5 m grid, EPSG:2154; sampled every 1.0 m, bilinear interpolation
TilesE477-N6204, E477-N6205, E477-N6208, E478-N6204, E478-N6205, E478-N6206, E478-N6207, E478-N6208, E479-N6203, E479-N6204, E479-N6205, E479-N6206, E479-N6207
Road centrelineOpenStreetMap (local PBF extract)
Quality statusevidence quality B; caveated windows: structure excluded, structure excluded min
AnalysisOCL 0.1.0, analysis 0.1.0, run fr-pyr2, calculated 2026-09-20

Provenance

{
  "analysis_version": "0.1.0",
  "run_manifest": {
    "manifest_version": "1",
    "code_git_sha": "06fa4c370391597f015858e97dcf01ca2f5b3640",
    "code_git_dirty": "false",
    "analysis_version": "0.1.0",
    "analysis_config_digest": "sha256:0048c2bbb24ab95e",
    "python": "3.14.4",
    "numpy": "2.5.3",
    "rasterio": "1.5.1",
    "pyproj": "3.8.0",
    "laspy": "2.7.0",
    "shapely": "2.1.2",
    "pyosmium": "4.3.1",
    "libosmium": "2.23.1",
    "gdal": "3.12.4",
    "proj": "9.8.1",
    "run_id": "fr-pyr2",
    "road_pbf": "block-batch-fr-pyr2.osm.pbf",
    "region_key": "france",
    "crs": "EPSG:2154",
    "elevation_provider_key": "ign-lidarhd",
    "tile_index": "wms-grid",
    "authority": "bdtopo",
    "registry_pbf": "france-vosges-2026-09-16.osm.pbf",
    "tile_index_snapshot": "sha256:c54ac68b3f57b41b"
  },
  "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_E477-N6204_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E477-N6205_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E477-N6208_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E478-N6204_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E478-N6205_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E478-N6206_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E478-N6207_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E478-N6208_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E479-N6203_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E479-N6204_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E479-N6205_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E479-N6206_0m5@21LHD1GR2-2025-04-03.tif",
    "data/cache/fr/ign-lidarhd_dtm_E479-N6207_0m5@21LHD1GR2-2025-04-03.tif"
  ],
  "calculated_at": "2026-09-20T06:49:36+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-pyr2.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-pyr2",
  "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": [
    "E477-N6204",
    "E477-N6205",
    "E477-N6208",
    "E478-N6204",
    "E478-N6205",
    "E478-N6206",
    "E478-N6207",
    "E478-N6208",
    "E479-N6203",
    "E479-N6204",
    "E479-N6205",
    "E479-N6206",
    "E479-N6207"
  ],
  "elevation_blocks": [
    "21LHD1GR2@2025-04-03"
  ],
  "ign_dalles": [
    "LHD_FXX_0477_6205_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0477_6206_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0477_6209_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0478_6205_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0478_6206_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0478_6207_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0478_6208_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0478_6209_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0479_6204_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0479_6205_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0479_6206_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0479_6207_MNT_O_0M50_LAMB93_IGN69",
    "LHD_FXX_0479_6208_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
    "21LHD1GR2"
  ],
  "ign_editions": [
    "2025-04-03"
  ],
  "ign_dsm_edition": {
    "LHD_FXX_0477_6205_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0477_6206_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0477_6209_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0478_6205_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0478_6206_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0478_6207_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0478_6208_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0478_6209_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0479_6204_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0479_6205_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0479_6206_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0479_6207_MNT_O_0M50_LAMB93_IGN69": "2025-04-03",
    "LHD_FXX_0479_6208_MNT_O_0M50_LAMB93_IGN69": "2025-04-03"
  },
  "climb_origin": "named-pass",
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 2] No such file or directory: 'data/cache/fr/ign-lidarhd_dsm_E478-N6207_0m5@21LHD1GR2-2025-04-03.part.tif' -> 'data/cache/fr/ign-lidarhd_dsm_E478-N6207_0m5@21LHD1GR2-2025-04-03.tif'",
  "structure_own_ways": 7,
  "structure_mask_ranges_m": [
    [
      6911.8,
      6924.1
    ],
    [
      7925.3,
      7933.5
    ]
  ],
  "mask_basin_extension_m": 30.0,
  "carriageway": {
    "stations": 403,
    "stations_resolved": 403,
    "width_median_m": 5.75,
    "width_p10_m": 4.75,
    "width_min_m": 1.75,
    "width_max_m": 12.0,
    "bounded_share": 0.179,
    "unbounded_share": 0.821,
    "confidence_median": 0.0,
    "width_median_bounded_m": 6.0,
    "window_m": [
      2942.0,
      2967.0
    ],
    "width_at_max25_m": 6.0,
    "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": {
      "status": "unavailable \u2014 no DSM raster (surface model absent or point-cloud only, which cannot serve off-line samples)"
    }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
}