Blar i Brage NMBU på forfatter "Ørka, Hans Ole"
-
Analysing forests naturalness in southern Norway using airborne laser scanning
Sinclair, Kevin Robertson (Master thesis, 2021)Biological and ecological important areas and species are in increasing focus now. Earlier protected areas have mostly excluded productive forest areas in Norway. The added focus on these areas combined with an increased ... -
Biomass estimation models and methods for miombo woodlands of Malawi using field and remotely sensed data
Kachamba, Daud Jones (PhD Thesis;2016:92, Doctoral thesis, 2016)Dry tropical forests, such as the miombo woodlands, play an important role in the global carbon budget as well as in contributing towards the sustainable development of countries such as Malawi. To ensure sustainability ... -
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) -
Blir miljøkriteriene for tilskuddsordningen overholdt ved gjødsling av skog?
Solli, Sander Strømsborg (Master thesis, 2020)Regjeringen ønsket i Stortingsmeldingen fra 2016 å øke karbonlageret i skogen og i tillegg øke tilgangen til miljøvennlige byggematerialer og råstoff. Flere tiltak ble foreslått og Regjeringen bevilget penger på statsbudsjettet ... -
Bruk av flybåren hyperspektral sensor for påvisning av råte i stående granskog (Picea abies)
Sørhuus, Øyvind (Master thesis, 2019)Det økonomisk viktigste treslaget i Norge er gran (Picea abies (L.) Karst.). Kvaliteten på tømmeret er en avgjørende faktor for det økonomiske utbytte en skogeier vil få fra skogen. Råte er en skadegjører som påvirker den ... -
Detection of root and butt rot in Norway Spruce (Picea Abies) using airborne hyperspectral images and laser scanning
Iversen, Erik Armand (Master thesis, 2020)The forest is an important renewable resource in a sustainable bioeconomy. Yearly, fungal decay causes economical losses that exceed 100 million NOK within the Norwegian forest sector. Root and butt rots are the main ... -
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) -
Er skogkartlegging med flybåren laser en mer hensiktsmessig måte for å finne områder med naturskog, enn Natur i Norge (NiN)'s naturskogkriterier? : en gjennomgang av to metoder for å skille gammel plukkhogd skog fra gammel flatehogd skog
Skeie, Margrethe Fønhus (Master thesis, 2019)Skogen i Norge har ulike naturgitte forutsetninger på regional skala, hvor klima, vekstforhold og skogbrukshistorie påvirker det biologiske mangfoldet. Fragmentering av skogområder, langtransportert forurensning, skogbruk, ... -
Improving forest inventory and monitoring by combining remotely sensed three-dimensional and spectral information
Ørka, Hans Ole (PhD Thesis;2011:22, Doctoral thesis, 2011)Forest inventory has benefited from remote sensing for more than 80 years. Spectral information from aerial cameras has been the dominant data source during this period. However, over the past decade the use of three-dimensional ... -
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) -
Luftburen laserskanning för identifiering av ansamlingar med grov död ved
Lindsköld, Gustaf (Master thesis, 2019)Död ved är viktigt för många arter både som föda och boplatser. Totalt 39% av de rödlistade arterna som lever i skogen är beroende av död ved. Kulturskog innehåller mindre volym död ved och klenare död ved jämfört med ... -
Mapping forest key habitats using machine learning and remote sensing data
Pedersen, Jon Hidle (Master thesis, 2019)The Norwegian forest habitat inventory (Miljøregistrering i skog, MiS), is a system used to classify different forest key habitats for use in forestry planning. The purpose of the system is to localize and map habitats ... -
Methods for estimation of major forest attributes based on remotely sensed data for the support of REDD+ measurement, reporting and verification (MRV)
Berie, Habitamu Taddese (PhD Thesis;2021:20, Doctoral thesis, 2021)There is limited information about the status of forest resources in Ethiopia. The available reports based on field sampling are inconsistent and lack precision due to limited sample sizes. Remotely sensed data, which cover ... -
Nasjonal overvåking av hule eiker : resultat andre omløp
Hatlevoll, Kristina; Burner, Ryan; Ørka, Hans Ole; Arnott, David; Lunde, Lisa Fagerli; Evju, Marianne; Birkemoe, Tone; Sverdrup-Thygeson, Anne (MINA fagrapport;62, Report, 2019)Hule eiker utgjør viktige hotspothabitater for en rekke arter i Norge. Eik er det viktigste hulromsdannende treet i Norge og i 2011 ble treslaget vedtatt som utvalgt naturtype (Lovdata 2011). Dette ledet til oppstarten av ... -
Use of remote sensing for mapping of non-native conifer species
Ørka, Hans Ole; Hauglin, Marius (MINA fagrapport;33, Report, 2016)Non-native species are by many considered a threat to local biodiversity. In Norway, conifer species have been introduced in order to find species with better timber production than the native species. Several of these ... -
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 ...