Search Results - "Pitkänen, Timo"

Measuring stem diameters with TLS in boreal forests by complementary fitting procedure by Pitkänen, Timo P., Raumonen, Pasi, Kangas, Annika

“…Point clouds generated by terrestrial laser scanners (TLS) have enabled new ways to measure stem diameters. A common method for diameter calculation is to fit…”
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Detecting Spatial Patterns of Peatland Greenhouse Gas Sinks and Sources with Geospatial Environmental and Remote Sensing Data by Christiani, Priscillia, Rana, Parvez, Räsänen, Aleksi, Pitkänen, Timo P., Tolvanen, Anne

“…Peatlands play a key role in the circulation of the main greenhouse gases (GHG) – methane (CH 4 ), carbon dioxide (CO 2 ), and nitrous oxide (N 2 O)…”
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Improving TLS-based stem volume estimates by field measurements by Pitkänen, Timo P., Raumonen, Pasi, Liang, Xinlian, Lehtomäki, Matti, Kangas, Annika

“…•Predicting stem volumes using terrestrial laser scanning (TLS) is prone to errors.•To reduce these errors, we propose taking advantage of field…”
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A new method to estimate branch biomass from terrestrial laser scanning data by bridging tree structure models by Hu, Man, Pitkänen, Timo P, Minunno, Francesco, Tian, Xianglin, Lehtonen, Aleksi, Mäkelä, Annikki

“…Branch biomass and other attributes are important for estimating the carbon budget of forest stands and characterizing crown structure. As destructive…”
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Mixed linear and non-linear tree volume models with regional parameters to main tree species in Finland by Kangas, Annika, Pitkänen, Timo P, Mehtätalo, Lauri, Heikkinen, Juha

“…Abstract The volume models that have been used in Finland for the last 40 years, while generally well thought-out, exhibit an illogical behaviour for small…”
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Detecting structural changes induced by Heterobasidion root rot on Scots pines using terrestrial laser scanning by Pitkänen, Timo P., Piri, Tuula, Lehtonen, Aleksi, Peltoniemi, Mikko

“…•Terrestrial laser scanning can be used to detect Scots pines infected by root rot.•Detection bases on structural differences interpreted from point cloud…”
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Automatized Sentinel-2 mosaicking for large area forest mapping by Pitkänen, Timo P., Balazs, Andras, Tuominen, Sakari

“…•We construct three separate Sentinel-2 mosaics using different mosaicking methods.•One is manually constructed mosaic and two others using Google Earth Engine…”
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Breeding value reliabilities for multiple-trait single-step genomic best linear unbiased predictor by Ben Zaabza, Hafedh, Taskinen, Matti, Mäntysaari, Esa A., Pitkänen, Timo, Aamand, Gert Pedersen, Strandén, Ismo

“…Approximate multistep methods to calculate reliabilities for estimated breeding values in large genetic evaluations were developed for single-trait (ST-R2A)…”
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Re-calibrating stem volume models – is there change in the tree trunk form from the 1970s to the 2010s in Finland? by Kangas, Annika, Henttonen, Helena, Pitkänen, Timo, Sarkkola, Sakari, Heikkinen, Juha

“…The tree stem volume models of Norway spruce, Scots pine and silver and downy birch currently used in Finland are based on data collected during 1968–1972…”
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Using auxiliary data to rationalize smartphone-based pre-harvest forest mensuration by Pitkänen, Timo P, Räty, Minna, Hyvönen, Pekka, Korhonen, Kari T, Vauhkonen, Jari

“…Abstract Accurate mensuration of forest stands for pre-harvest planning will pose high costs if carried out by a professional forester as an on-site…”
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A computationally efficient method for approximating reliabilities in large-scale single-step genomic prediction by Gao, Hongding, Kudinov, Andrei A, Taskinen, Matti, Pitkänen, Timo J, Lidauer, Martin H, Mäntysaari, Esa A, Strandén, Ismo

“…In this study, computationally efficient methods to approximate the reliabilities of genomic estimated breeding values (GEBV) in a single-step genomic…”
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Statistical Analysis of Whistler Precursors Upstream of Foreshock Transient Shocks: MMS Observations by Wang, Mengmeng, Liu, Terry Z., Zhang, Hui, Liu, Kaijun, Shi, Quanqi, Guo, Ruilong, Tian, Anmin, Sun, Weijie, Shen, Xiao‐Chen, Wu, Siyuan, Degeling, Alexander W., Wang, Yan, Bai, Shi‐Chen, Yao, Zhonghua, Li, Wenya, Zhang, Shuai, Pitkänen, Timo, Yao, Shutao, Liu, Ji, Cheng, Kun, Ma, Xiao, Liu, Yuqi

“…Using the high‐time‐resolution data from the Magnetospheric Multiscale mission, precursor waves upstream of foreshock transient (FT) shocks are statistically…”
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A reexamination of latitudinal limits of substorm-produced energetic electron precipitation by Cresswell-Moorcock, Kathy, Rodger, Craig J., Kero, Antti, Collier, Andrew B., Clilverd, Mark A., Häggström, Ingemar, Pitkänen, Timo

“…The primary sources of energetic electron precipitation (EEP) which affect altitudes <100 km (>30 keV) are expected to be from the radiation belts and during…”
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Assessing Restoration Potential of Semi-natural Grasslands by Landscape Change Trajectories by Pitkänen, Timo P, Mussaari, Maija, Käyhkö, Niina

“…Species-rich semi-natural grasslands have rapidly declined and become fragmented in Northern Europe due to ceased traditional agricultural practices and animal…”
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Asymmetry in the Earth’s magnetotail neutral sheet rotation due to IMF $$B_y$$ sign? by Pitkänen, Timo, Kullen, Anita, Cai, Lei, Park, Jong-Sun, Vanhamäki, Heikki, Hamrin, Maria, Aikio, Anita T., Chong, G. Siung, De Spiegeleer, Alexandre, Shi, Quanqi

“…Evidence suggests that a non-zero dawn–dusk interplanetary magnetic field (IMF $$B_y$$ B y ) can cause a rotation of the cross-tail current sheet/neutral sheet…”
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Asymmetry in the Earth’s magnetotail neutral sheet rotation due to IMF By sign? by Pitkänen, Timo, Kullen, Anita, Cai, Lei, Park, Jong-Sun, Vanhamäki, Heikki, Hamrin, Maria, Aikio, Anita T., Chong, G. Siung, De Spiegeleer, Alexandre, Shi, Quanqi

“…Evidence suggests that a non-zero dawn–dusk interplanetary magnetic field (IMF B y ) can cause a rotation of the cross-tail current sheet/neutral sheet around…”
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Slip, trip and fall injuries in potato, sugar beet and open field vegetable production in Finland by Mattila, Tiina E.A., Kaustell, Kim O., Rautiainen, Risto H., Pitkänen, Timo J., Lötjönen, Timo, Suutarinen, Juha

“…STF injuries are common in agriculture. The purposes of this study were to assess the magnitude of STF injuries, to identify contributing factors and to…”
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Neutral lipid fatty acid analysis is a sensitive marker for quantitative estimation of arbuscular mycorrhizal fungi in agricultural soil with crops of different mycotrophy by Vestberg, Mauritz, Palojärvi, Ansa, Pitkänen, Timo, Kaipainen, Saara, Puolakka, Elina, Keskitalo, Marjo

“…The impact of host mycotrophy on arbuscular mycorrhizal fungal (AMF) markers was studied in a temperate agricultural soil cropped with mycorrhizal barley,…”
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Importance of the dusk-dawn interplanetary magnetic field component (IMF By) to magnetospheric convection in Earth’s magnetotail plasma sheet by Pitkänen, Timo, Kullen, Anita, Chong, Ghai Siung

“…The solar wind and its embedded magnetic field, the interplanetary magnetic field (IMF) together with magnetic reconnection power the large-scale plasma and…”
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Reconstruction of Plasma Structure with Anisotropic Pressure: Application to Pc5 Compressional Wave by Tian, Anmin, Xiao, Kai, Degeling, Alexander William, Shi, Quanqi, Park, Jong-Sun, Nowada, Motoharu, Pitkänen, Timo

“…The conventional Grad-Shafranov (GS) method is designed to reconstruct a two-dimensional magnetohydrostatic structure with isotropic pressure. In this work, we…”
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