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Hans Ole Ørka

Researcher at Norwegian University of Life Sciences

Publications -  59
Citations -  3336

Hans Ole Ørka is an academic researcher from Norwegian University of Life Sciences. The author has contributed to research in topics: Forest inventory & Environmental science. The author has an hindex of 24, co-authored 46 publications receiving 2784 citations.

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Lidar sampling for large-area forest characterization: A review

TL;DR: In this article, the authors present the case for using Lidar sampling as a means to enable timely and robust large-area characterizations, and discuss the potential of using lidar in an integrated sampling framework for large area ecosystem characterization and monitoring.
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Tree Species Classification in Boreal Forests With Hyperspectral Data

TL;DR: Evaluating the potential of two high spectral and spatial resolution hyperspectral sensors, operating at different wavelengths, for tree species classification of boreal forests showed that the HySpex VNIR 1600 sensor is effective in borealTree species classification with kappa accuracies over 0.8.
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Inventory of Small Forest Areas Using an Unmanned Aerial System

TL;DR: The results revealed that the use of UAS imagery can provide relatively accurate and timely forest inventory information at a local scale, and highlights the practical advantages of U AS-assisted forest inventories, including adaptive planning, high project customization, and rapid implementation, even under challenging weather conditions.
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Classifying species of individual trees by intensity and structure features derived from airborne laser scanner data

TL;DR: In this paper, a study was conducted on 197 Norway spruce and 180 birch trees (leaves on conditions) in a boreal forest reserve in Norway using an airborne laser scanner (ALS) data.
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Tree species classification using airborne LiDAR - effects of stand and tree parameters, downsizing of training set, intensity normalization, and sensor type

TL;DR: In this article, the authors examined the single-trees-level response of two LiDAR sensors in over 13, 000 forest trees in southern Finland and achieved an accuracy of 88−90% in the classification of Scots pine, Norway spruce, and birch.