What this data measures
The cantonal landslide hazard layer shows areas where landslides have been recorded historically or are predicted to occur under specific return-period scenarios.
Values indicate hazard intensity categories, typically low, medium, and high, together with the expected frequency of occurrence.
How to interpret it
A landslide overlay on your parcel means the canton has identified non-zero landslide exposure for that area.
The intensity classification reflects how severe an event is expected to be, not how likely it is to happen tomorrow.
Sites in low-hazard zones are still considered safe for residential use under current cantonal zoning rules.
For properties in medium or high zones, cantonal hazard maps are the authoritative source, and a site-specific geotechnical assessment is the only way to gain certainty for a specific building.