 The use of unmanned aerial systems, UAS, has been shown to be effective in providing accurate and timely forest inventory information at a local scale. This is due to its ability to capture high spatial and temporal resolution images which can then be used to accurately estimate key forestry parameters such as mean height, dominant height, stem number, basal area and volume. Additionally, the use of UAS allows for more flexible and adaptable planning, customization and implementation, even when faced with adverse weather conditions. This article was authored by Stefano Pilatai, Hans Ole Orca, Tarja Gubacken and others.