559.0 m · net rise 76.3 m · overall 13.6% · evidence quality A (high) · Hol · Buskerud
Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 437 m.
Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the NVDB road network, OpenStreetMap and a second terrain model, but a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | 26% | 157–159 m | |
| 3 m (diagnostic) | 25% | 157–160 m | |
| 5 m | 24% | 191–196 m | |
| 10 m | 22% | 191–201 m | |
| 20 m | 21.0% | 187–207 m | |
| 25 m | 20.8% | 179–204 m | |
| 50 m | 19.7% | 157–207 m | |
| 100 m | 18.6% | 101–201 m |
may start earliermay continue beyond end Extent detection suggests reviewing where this climb starts/ends.
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: NVDB, Norway's National Road Database records no surface for this road; the map may tell you more.
Access: Ranked 2026-10-05 (D27, road authority): NVDB carries 100% of the route as public road (11% restricted), which answers the OSM audit question (untagged surface).
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 |
| Tiles | E133500-N6738500, E134000-N6738500 |
| Road centreline | OpenStreetMap (local PBF extract) |
| Quality status | evidence quality A; no review flags; no caveated windows |
| Analysis | OCL 0.1.0, analysis 0.1.0, run no-b03, calculated 2026-10-04 |
Provenance
{
"analysis_version": "0.1.0",
"run_manifest": {
"manifest_version": "1",
"code_git_sha": "368c60c29e47d4b421849c953b172a04f7694146",
"code_git_dirty": "false",
"analysis_version": "0.1.0",
"analysis_config_digest": "sha256:8c94015b54267da4",
"python": "3.14.4",
"numpy": "2.5.3",
"rasterio": "1.5.2",
"pyproj": "3.8.0",
"laspy": "2.7.0",
"shapely": "2.1.2",
"pyosmium": "4.3.1",
"libosmium": "2.23.1",
"gdal": "3.12.2",
"proj": "9.8.1",
"run_id": "no-b03",
"road_pbf": "no-b03-block-batch-no-b03.osm.pbf",
"region_key": "norway",
"crs": "EPSG:25833",
"elevation_provider_key": "nhm-no",
"tile_index": "nhm-window",
"authority": "nvdb",
"registry_pbf": "norway-2026-10-01.osm.pbf"
},
"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
],
"scale_correction": "point",
"scale_correction_crs": "EPSG:25833",
"elevation_crs": "EPSG:25833",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/no/nhm-no_dtm_E133500-N6738500_1m.tif",
"data/cache/no/nhm-no_dtm_E134000-N6738500_1m.tif"
],
"calculated_at": "2026-10-04T01:19:35+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/no-b03-block-batch-no-b03.osm.pbf",
"osm_snapshot": "",
"run_id": "no-b03",
"elevation_provider": "Kartverket NHM DTM 1 m (laser-covered ground only)",
"elevation_licence": "CC BY 4.0 \u2014 \u00a9 Kartverket (https://www.kartverket.no/api-og-data/vilkar-for-bruk)",
"elevation_dataset": "Nasjonal h\u00f8ydemodell (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",
"elevation_vertical_datum": "NN2000",
"elevation_tile_ids": [
"E133500-N6738500",
"E134000-N6738500"
],
"elevation_blocks": [
"nhm-dtm-1m"
],
"nhm_laser_projects": [
{
"last_flight_date": "2024-09-19",
"name": "Hallingdal 5pkt del1 2024",
"points_per_m2": 5,
"resolution_m": 0.25,
"season": "",
"year": 2024
},
{
"last_flight_date": "2013-07-10",
"name": "Hol Eidfjord 2012",
"points_per_m2": 1,
"resolution_m": 1,
"season": "",
"year": 2012
},
{
"last_flight_date": "2023-10-09",
"name": "Innlandet-Viken flom-skred 2023",
"points_per_m2": 5,
"resolution_m": 0.25,
"season": "",
"year": 2023
},
{
"last_flight_date": "2018-06-06",
"name": "NDH Hol-\u00c5l 5pkt 2018",
"points_per_m2": 5,
"resolution_m": 0.25,
"season": "",
"year": 2018
}
],
"nhm_last_flight_date": "2024-09-19",
"nhm_retrieved_at": "2026-10-03T18:02:29Z",
"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",
"route_cut_m": 559.7,
"climb_origin": "discovered",
"seam_filled_samples": {
"count": 0,
"distances_m": []
},
"seam_filled_in_maximum": false,
"structure_own_ways": 3,
"tunnel_check": "osm tunnel=* ways on 3 own way(s)",
"tunnel_ranges_m": [],
"underground_fraction": 0.0,
"structure_mask_ranges_m": [
[
0.0,
15.0
]
],
"carriageway": {
"stations": 29,
"stations_resolved": 29,
"width_median_m": 5.25,
"width_p10_m": 2.25,
"width_min_m": 2.0,
"width_max_m": 12.0,
"bounded_share": 0.241,
"unbounded_share": 0.759,
"confidence_median": 0.0,
"width_median_bounded_m": 4.75,
"window_m": [
179.0,
204.0
],
"width_at_max25_m": 2.25,
"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": 29,
"stations_resolved": 29,
"width_median_m": 7.75,
"width_p10_m": 5.45,
"width_min_m": 3.25,
"width_max_m": 12.0,
"bounded_share": 0.517,
"unbounded_share": 0.483,
"confidence_median": 0.883,
"width_median_bounded_m": 6.5,
"window_m": [
179.0,
204.0
],
"width_at_max25_m": 7.25,
"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"
}