Browsing NIBIO Brage by Author "Ørka, Hans Ole"
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Detection of Root, Butt, and Stem Rot presence in Norway spruce with hyperspectral imagery
Allen, Benjamin James; Dalponte, Michele; Hietala, Ari Mikko; Ørka, Hans Ole; Næsset, Erik; Gobakken, Terje (Peer reviewed; Journal article, 2022-02-16)Pathogenic wood decay fungi such as species of Heterobasidion are some of the most serious forest pathogens in Europe, causing rot of tree boles and loss of growth, with estimated economic losses of eight hundred million ... -
Land cover classification of treeline ecotones along a 1100 km latitudinal transect using spectral- and three-dimensional information from UAV-based aerial imagery
Mienna, Ida Marielle; Klanderud, Kari; Ørka, Hans Ole; Bryn, Anders; Bollandsås, Ole Martin (Peer reviewed; Journal article, 2022-03-04)The alpine treeline ecotone is expected to move upwards in elevation with global warming. Thus, mapping treeline ecotones is crucial in monitoring potential changes. Previous remote sensing studies have focused on the usage ... -
UAV-Based Hyperspectral Imagery for Detection of Root, Butt, and Stem Rot in Norway Spruce
Allen, Benjamin James; Dalponte, Michele; Ørka, Hans Ole; Næsset, Erik; Puliti, Stefano; Astrup, Rasmus Andreas; Gobakken, Terje (Peer reviewed; Journal article, 2022-08-08)Numerous species of pathogenic wood decay fungi, including members of the genera Heterobasidion and Armillaria, exist in forests in the northern hemisphere. Detection of these fungi through field surveys is often difficult ...