LIVING SURVEY — measurements are reviewed continuously as new data and local evidence arrive. Seen a sign, a gate, or a better name? Submit an update no account needed · photos welcome via GitHub
25028.7 m · net rise 738.4 m · total ascent 911.0 m · overall 3.0% · evidence quality B (good) · Lom · Innlandet
Shape: stepped — 47% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 72 m.
Not yet matched against documented climbs — the measurement stands on its own.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈29% | 16114–16116 m | under overhead cover terrain reads 105.5% at 20528–20530 m across a structure — excluded |
| 3 m (diagnostic) | ≈24% | 16113–16116 m | under overhead cover terrain reads 97.6% at 20527–20530 m across a structure — excluded |
| 5 m | ≈14% | 20633–20638 m | under overhead cover terrain reads 78.5% at 20526–20531 m across a structure — excluded |
| 10 m | ≈14% | 20631–20641 m | under overhead cover terrain reads 47.1% at 22400–22410 m across a structure — excluded |
| 20 m | ≈13.6% | 20625–20645 m | under overhead cover terrain reads 26.9% at 22400–22420 m across a structure — excluded |
| 25 m | ≈13.4% | 20625–20650 m | under overhead cover terrain reads 22.7% at 22400–22425 m across a structure — excluded |
| 50 m | ≈12.6% | 20610–20660 m | under overhead cover terrain reads 14.2% at 22400–22450 m across a structure — excluded |
| 100 m | ≈10.8% | 20571–20671 m | under overhead cover terrain reads 11.1% at 20526–20626 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 NVDB, Norway's National Road Database.
Access: Ranked 2026-10-05 (D27, road authority): NVDB carries 100% of the route as public road (0% restricted), which answers the OSM audit question (barrier gate without an access tag). A barrier gate without an access tag sits on the route; gates on public roads are usually seasonal — check on the ground.
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 · Share this climb
Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%
Route line = the road surface as the LiDAR survey finds it. Basemap roads are for orientation and may sit a few metres off.
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
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).
Measurement card
| Elevation | Kartverket NHM DTM 1 m (laser-covered ground only) — Nasjonal høydemodell (NHM) DTM, 1 m, EPSG:25833, NN2000 (Kartverket), served by the hoydedata.no ImageServer; ground without a laser project is a coarser resampled product and is never measured |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:25833; sampled every 1.0 m, bilinear interpolation |
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| Road centreline | OpenStreetMap (local PBF extract) |
| Quality status | evidence quality B; caveated windows: structure excluded, structure excluded min, texture excluded, texture excluded min |
| Analysis | OCL 0.1.0, analysis 0.1.0, run no-b06, calculated 2026-10-03 |
Provenance
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],
"nhm_retrieved_at": "2026-10-03T19:24:59Z",
"nhm_note": "laser projects overlapping the route's cells; the mosaic draws on them by its own priority and which project supplied which pixel is not recorded",
"climb_origin": "named-pass",
"named_pass": "Sognefjellet",
"seam_filled_samples": {
"count": 0,
"distances_m": []
},
"seam_filled_in_maximum": false,
"structure_own_ways": 20,
"tunnel_check": "osm tunnel=* ways on 20 own way(s)",
"tunnel_ranges_m": [],
"underground_fraction": 0.0,
"structure_mask_ranges_m": [
[
12094.6,
12111.9
],
[
22416.3,
22441.6
],
[
16122.5,
16139.6
],
[
20450.2,
20489.3
],
[
17719.2,
17739.6
],
[
20537.3,
20565.6
]
],
"carriageway": {
"stations": 1007,
"stations_resolved": 1007,
"width_median_m": 5.75,
"width_p10_m": 5.0,
"width_min_m": 3.25,
"width_max_m": 11.5,
"bounded_share": 0.284,
"unbounded_share": 0.716,
"confidence_median": 0.0,
"width_median_bounded_m": 6.0,
"window_m": [
20625.0,
20650.0
],
"width_at_max25_m": 4.25,
"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": 1007,
"stations_resolved": 1007,
"width_median_m": 10.0,
"width_p10_m": 7.75,
"width_min_m": 2.5,
"width_max_m": 12.0,
"bounded_share": 0.562,
"unbounded_share": 0.438,
"confidence_median": 0.899,
"width_median_bounded_m": 9.0,
"window_m": [
20625.0,
20650.0
],
"width_at_max25_m": 7.88,
"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"
}