Snow avalanches - rough susceptibility zones

Dataset

Susceptibility areas for snow avalanches is a national series of maps showing areas that are potentially vulnerable to snow avalanches (susceptibility areas) at a general level. The maps show potential source areas and run-out areas for snow avalanches. Your attention is drawn to the fact that the areas covered by source areas are in practice run-out areas as well, as avalanches that are triggered right at the top of the source area move through the source areas below, before reaching the run-out areas at the bottom. Therefore, both source areas and run-out areas should generally be used together when using the dataset for analysis purposes. The susceptibility areas are identified by means of a data model which uses the slope of the terrain to recognise terrain where avalanches may be triggered. The run-out area is calculated automatically from each trigger area. No fieldwork is done when defining the areas, so the impacts of local factors (e.g. forest, terrain details, safety measures implemented, etc.) have not been assessed. The susceptibility areas are not applicable to the risks linked with slush avalanches.

Specific usage

Susceptibility maps for snow avalanches are suitable for land use planning at municipal plan level.

Distributions

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Contact information

Logo Norges vassdrags- og energidirektorat

Contact metadata:
Søren E. Kristensen, sek@nve.no – Norwegian Water Resources and Energy Directorate

Contact owner:
Eli K. Øydvin, eko@nve.no – Norwegian Water Resources and Energy Directorate

Contact publisher:
Ivar Peereboom, iope@nve.no – Norwegian Water Resources and Energy Directorate

Distribution

Spatial representation: Vector

Format:
  • FGDB 10.0
  • GML 3.2.1
  • PostGIS 9.4
  • SOSI 4.5

Distribution type: Geonorge download

Units of distribution: fylkesvis, kommunevis, landsfiler

Reference systems:
  • EUREF89 UTM sone 32, 2d
  • EUREF89 UTM sone 33, 2d
  • EUREF89 UTM sone 35, 2d
  • EUREF 89 Geografisk (ETRS 89) 2d

Constraints

Use limitations: No conditions apply

Access constraints: Open data

Use constraints: License

Licence: Norsk lisens for offentlige data (NLOD)

Security constraints: Unclassified

Help

The dataset snow avalanche susceptibility areas comprises the polygon themes **UtlosningOmr** and **UtlopOmr**. **UtlosningOmr** covers areas where avalanches may potentially be triggered (source area), while **UtlopOmr** similarly covers the potential run-out areas for these trigger areas. Susceptibility maps for snow avalanches are basic overview maps that identify susceptibility areas for avalanches. A national elevation model (Norwegian Mapping Authority) with a resolution of 25x25 metres is used, where the basic data is based mainly on 20 m contour lines. This is equivalent to what is found in a standard topographical map in the mapscale 1:50 000.