The Swiss National Forest Inventory NFI

The Swiss National Forest Inventory (NFI) records the current state and the changes of the Swiss forest. The survey obtains data about trees, stands, sample plots as well as data from enquiries at the local forest service. We publish results about forest area, stem count, volume, increment, yield and many more.

The NFI is carried out by the Swiss Federal Institute for Forest, Snow and Landscape Research (WSL) in collaboration with the Forest Division at Federal Office for the Environment (FOEN ). The WSL is responsible for the planning, survey and analysis, as well as the scientific interpretation and publication of the NFI. The political interpretation and implementation is done by the Forest Division.

The inventory was carried out for the first time in 1983–1985 (NFI1), followed by three additional surveys in 1993–1995 (NFI2), 2004–2006 (NFI3), and 2009–2017 (NFI4). Since 2009, data have been collected continuously over a nine-year period. Currently, the fifth inventory is underway from 2018–26 (NFI5).