NILS is a nation-wide environmental protection programme that monitors the conditions and changes in the Swedish landscape.
The programme started in 2003 and includes field inventory and aerial photo interpretation of permanent sample plots in all types of terrestrial environments.
NILS is mainly funded by the Swedish Environmental Protection Agency and an important objective is to provide information for follow-up of the Swedish national environmental objectives and the Natura 2000 network. NILS also contributes data to environmental research and international reporting.
Combination of line surveys and plot surveys in the field, as well as aerial photo interpretation for 631 survey squares distributed across Sweden.