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Col du Pourtalet from Laruns

28136.9 m · net rise 1277.9 m · total ascent 1486.8 m · overall 4.5% · evidence quality U (needs confirmation) · Laruns · Pyrénées-Atlantiques ·

Shape: sustained — 33% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 33 m.

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

needs review short window divergence — treat short-window maxima here as provisional.

≈ Overhead cover (tree canopy or structures) spans 7% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.

Gradient ladder what do windows mean?

WindowMaximumLocated at
2 m (diagnostic)≈44%23764–23766 munder overhead cover terrain reads 809.7% at 968–970 m across a structure — excluded
3 m (diagnostic)≈32%23763–23766 munder overhead cover terrain reads 723.7% at 968–971 m across a structure — excluded
5 m≈22%3908–3913 munder overhead cover terrain reads 473.6% at 968–973 m across a structure — excluded
10 m≈13%22902–22912 munder overhead cover terrain reads 248.7% at 968–978 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded
20 m≈11.2%22081–22101 munder overhead cover terrain reads 123.0% at 968–988 m across a structure — excluded
25 m≈11.0%22081–22106 munder overhead cover terrain reads 99.7% at 968–993 m across a structure — excluded
50 m≈9.6%22067–22117 munder overhead cover terrain reads 52.3% at 968–1018 m across a structure — excluded
100 m≈8.8%24910–25010 munder overhead cover terrain reads 28.6% at 968–1068 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.

Access: Listed 2026-09-20 (inventory hunt wave 1): road audit — barrier lift_gate (yes) 0.0 m off route. Never silently ranked or dropped (Peter, 2026-08-27).

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)

Col du Pourtalet from Laruns 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).

Col du Pourtalet from Laruns elevation profile
Col du Pourtalet from Laruns 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
TilesE418-N6207, E418-N6208, E418-N6209, E418-N6210, E418-N6211, E418-N6212, E418-N6213, E419-N6195, E419-N6196, E419-N6204, E419-N6205, E419-N6206, E419-N6207, E419-N6208, E419-N6210, E419-N6211, E419-N6212, E419-N6213, E419-N6214, E420-N6195, E420-N6196, E420-N6197, E420-N6204, E420-N6205, E420-N6214, E421-N6196, E421-N6197, E421-N6202, E421-N6203, E421-N6204, E421-N6214, E422-N6196, E422-N6197, E422-N6198, E422-N6199, E422-N6200, E422-N6201, E422-N6202, E422-N6203, E422-N6204, E423-N6197, E423-N6198, E423-N6199, E423-N6200
Road centrelineOpenStreetMap (local PBF extract)
Quality statusevidence quality U; review flags: short window divergence
AnalysisOCL 0.1.0, analysis 0.1.0, run fr-pyr1, calculated 2026-09-20

Provenance

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  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
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    "LHD_FXX_0418_6210_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0418_6211_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0418_6212_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
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    "LHD_FXX_0419_6205_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6206_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6207_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6208_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6209_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6211_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6212_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6213_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6214_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0419_6215_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6196_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6197_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6198_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6205_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6206_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0420_6215_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6197_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6198_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6203_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6204_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6205_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0421_6215_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6197_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6198_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6199_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6200_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6201_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6202_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6203_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6204_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0422_6205_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0423_6198_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0423_6199_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0423_6200_MNT_O_0M50_LAMB93_IGN69": "2025-03-21",
    "LHD_FXX_0423_6201_MNT_O_0M50_LAMB93_IGN69": "2025-03-21"
  },
  "climb_origin": "named-pass",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
    "stations": 1132,
    "stations_resolved": 1132,
    "width_median_m": 7.0,
    "width_p10_m": 5.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.337,
    "unbounded_share": 0.663,
    "confidence_median": 0.0,
    "width_median_bounded_m": 6.5,
    "window_m": [
      22081.0,
      22106.0
    ],
    "width_at_max25_m": 11.0,
    "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": 1132,
      "stations_resolved": 1132,
      "width_median_m": 8.25,
      "width_p10_m": 2.5,
      "width_min_m": 0.0,
      "width_max_m": 12.0,
      "bounded_share": 0.631,
      "unbounded_share": 0.369,
      "confidence_median": 1.0,
      "width_median_bounded_m": 6.5,
      "window_m": [
        22081.0,
        22106.0
      ],
      "width_at_max25_m": 12.0,
      "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"
}