Browsing Publikasjoner fra Cristin - NMBU by Author "Ørka, Hans Ole"
Now showing items 1-10 of 10
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Biomass Estimation Using 3D Data from Unmanned Aerial Vehicle Imagery in a Tropical Woodland
Kachamba, Daud Jones; Ørka, Hans Ole; Gobakken, Terje; Eid, Tron; Mwase, Weston (Journal article; Peer reviewed, 2016) -
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)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 ... -
Discriminating between native norway spruce and invasive sitka spruce-A comparison of multitemporal Landsat 8 imagery, aerial images and airborne laser scanner data
Hauglin, Marius; Ørka, Hans Ole (Journal article; Peer reviewed, 2016) -
Effects of forest structure and airborne laser scanning point cloud density on 3D delineation of individual tree crowns
Kandare, Kaja; Ørka, Hans Ole; Chan, Jonathan Cheung-Wai; Dalponte, Michele (Peer reviewed; Journal article, 2016) -
Influence of plot size on efficiency of biomass estimates in inventories of dry tropical forests assisted by photogrammetric data from an unmanned aircraft system
Kachamba, Daud Jones; Ørka, Hans Ole; Næsset, Erik; Eid, Tron Haakon; Gobakken, Terje (Journal article; Peer reviewed, 2017) -
Inventory of small forest areas using an unmanned aerial system
Puliti, Stefano; Ørka, Hans Ole; Gobakken, Terje; Næsset, Erik (Journal article; Peer reviewed, 2015) -
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)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 ... -
Mapping and Estimating Aboveground Biomass in an Alpine Treeline Ecotone under Model-Based Inference
Mukhopadhyay, Ritwika; Næsset, Erik; Gobakken, Terje; Mienna, Ida Marielle; Candelas Bielza, Jaime; Austrheim, Gunnar; Persson, Henrik Jan; Ørka, Hans Ole; Roald, Bjørn-Eirik; Bollandsås, Ole Martin (Peer reviewed; Journal article, 2023) -
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)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 ... -
Use of remotely sensed data to enhance estimation of aboveground biomass for the dry afromontane forest in south-central Ethiopia
Taddese, Habitamu; Asrat, Zerihun; Burud, Ingunn; Gobakken, Terje; Ørka, Hans Ole; Dick, Øystein B.; Næsset, Erik (Peer reviewed; Journal article, 2020)Periodic assessment of forest aboveground biomass (AGB) is essential to regulate the impacts of the changing climate. However, AGB estimation using field-based sample survey (FBSS) has limited precision due to cost and ...