Search Results - "Pisek, Jan"

3-dimensional surface geometry dataset of Scots pine and Norway spruce shoots from the Järvselja RAdiation transfer Model Intercomparison (RAMI) pine stand by Pisek, Jan, Borysenko, Oleksandr

“…Conifer shoots exhibit intricate geometries at an exceptionally detailed spatial scale. Describing the complete structure of a conifer shoot, which contributes…”
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Effects of foliage clumping on the estimation of global terrestrial gross primary productivity by Chen, Jing M., Mo, Gang, Pisek, Jan, Liu, Jane, Deng, Feng, Ishizawa, Misa, Chan, Douglas

“…Sunlit and shaded leaf separation proposed by Norman (1982) is an effective way to upscale from leaf to canopy in modeling vegetation photosynthesis. The…”
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Is the spherical leaf inclination angle distribution a valid assumption for temperate and boreal broadleaf tree species? by Pisek, Jan, Sonnentag, Oliver, Richardson, Andrew D., Mõttus, Matti

“…► Leaf angle distributions of 58 broadleaf tree species in temperate/boreal zone reported. ► 75 leaves enough for reliable estimates of tree level mean leaf…”
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Dataset of leaf inclination angles for 71 different Eucalyptus species by Pisek, Jan, Adamson, Kairi

“…The leaf inclination angle distribution is an important parameter in models useful for understanding forest canopy processes of photosynthesis,…”
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Measuring leaf angle distribution in broadleaf canopies using UAVs by McNeil, Brenden E., Pisek, Jan, Lepisk, Harald, Flamenco, Evelin A.

“…•Small, multi-rotor UAVs could be portable canopy research towers for measuring LAD.•We validate LAD of 5 tree species in USA and Europe, measured by 2 UAV…”
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Estimation of seasonal dynamics of understory NDVI in northern forests using MODIS BRDF data: Semi-empirical versus physically-based approach by Pisek, Jan, Rautiainen, Miina, Nikopensius, Maris, Raabe, Kairi

“…The spatial and temporal patterns of the forest background reflectance are critically important for retrieving the biophysical parameters of the forest canopy…”
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Spectral Properties of Coniferous Forests: A Review of In Situ and Laboratory Measurements by Rautiainen, Miina, Lukeš, Petr, Homolová, Lucie, Hovi, Aarne, Pisek, Jan, Mõttus, Matti

“…Coniferous species are present in almost all major vegetation biomes on Earth, though they are the most abundant in the northern hemisphere, where they form…”
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Estimating leaf inclination and G-function from leveled digital camera photography in broadleaf canopies by Pisek, Jan, Ryu, Youngryel, Alikas, Krista

“…The effectiveness of using leveled digital camera for measuring leaf inclination angles was investigated in this study as an inexpensive and convenient…”
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Note on the compatibility of ICOS, NEON, and TERN sampling designs, different camera setups for effective plant area index estimation with digital hemispherical photography by Kaha, Mihkel, Lang, Mait, Zhang, Shaohui, Pisek, Jan

“…Environmental monitoring networks such as the Integrated Carbon Observation System (ICOS) in Europe, the National Ecological Observatory Network (NEON) in the…”
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A dataset of leaf inclination angles for temperate and boreal broadleaf woody species by Chianucci, Francesco, Pisek, Jan, Raabe, Kairi, Marchino, Luca, Ferrara, Carlotta, Corona, Piermaria

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Estimation of Gap Fraction and Foliage Clumping in Forest Canopies by Kuusk, Andres, Pisek, Jan, Lang, Mait, Märdla, Silja

“…The gap fractions of three mature hemi-boreal forest stands in Estonia were estimated using the LAI-2000 plant canopy analyzer ( LI-COR Biosciences, Lincoln,…”
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Digital photography for tracking the phenology of an evergreen conifer stand by Lang, Mait, Nilson, Tiit, Kuusk, Andres, Pisek, Jan, Korhonen, Lauri, Uri, Veiko

“…•A regular digital camera was used as an imaging radiometer.•The LinearRatio is a reliable method for tracking the phenology of canopy gap fraction and…”
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Editorial for Special Issue “Optical Remote Sensing of Boreal Forests” by Rautiainen, Miina, Pisek, Jan

“…Boreal forests (or taiga) are the world’s largest terrestrial biome and represent one third of the world’s forest cover. [...]…”
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A note on suitable viewing configuration for retrieval of forest understory reflectance from multi-angle remote sensing data by Pisek, Jan, Lang, Mait, Kuusk, Joel

“…The contribution of understory vegetation especially to the reflectance of boreal forest landscapes cannot be ignored. In this letter, we identify the most…”
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Suitability of the boreal ecosystem simulator (BEPS) model for estimating gross primary productivity in hemi-boreal upland pine forest by Harun, Fariha, Soosaar, Kaido, Krasnova, Alisa, Pisek, Jan

“…Gross Primary Productivity (GPP) is the core component of the terrestrial and global carbon cycle and Earth’s climate research. In this study, GPP estimation…”
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Comparison and validation of MODIS and VEGETATION global LAI products over four BigFoot sites in North America by Pisek, Jan, Chen, Jing M.

“…A new set of recently developed leaf area index (LAI) algorithms has been employed for producing a global LAI dataset at 1 km resolution and in time-steps of…”
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Tracking the long-term structure changes of a mature deciduous broadleaf forest stand using digital hemispherical photography by Lang, Mait, Pisek, Jan

“…Hemispherical photography provides permanent records of forest canopy structure. We analysed digital hemispherical images taken during the period of 2007–2018…”
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Retrieval of seasonal dynamics of forest understory reflectance in a Northern European boreal forest from MODIS BRDF data by Pisek, Jan, Rautiainen, Miina, Heiskanen, Janne, Mõttus, Matti

“…The spatial and temporal patterns of the forest background reflectance are critically important for retrieving the biophysical parameters of the forest canopy…”
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Method comparison of indirect assessments of understory leaf area index (LAIu): A case study across the extended network of ICOS forest ecosystem sites in Europe by George, Jan-Peter, Yang, Wei, Kobayashi, Hideki, Biermann, Tobias, Carrara, Arnaud, Cremonese, Edoardo, Cuntz, Matthias, Fares, Silvano, Gerosa, Giacomo, Grünwald, Thomas, Hase, Niklas, Heliasz, Michael, Ibrom, Andreas, Knohl, Alexander, Kruijt, Bart, Lange, Holger, Limousin, Jean-Marc, Loustau, Denis, Lukeš, Petr, Marzuoli, Riccardo, Mölder, Meelis, Montagnani, Leonardo, Neirynck, Johan, Peichl, Matthias, Rebmann, Corinna, Schmidt, Marius, Serrano, Francisco Ramon Lopez, Soudani, Kamel, Vincke, Caroline, Pisek, Jan

“…•Three different understory leaf area index (LAIu) retrieval methods are compared.•The three methods show different strengths/weaknesses depending on LAI…”
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Estimation of vegetation clumping index using MODIS BRDF data by Pisek, Jan, Chen, Jing Ming, Nilson, Tiit

“…The foliage clumping index quantifies the degree of the deviation of leaf spatial distribution in the canopy from the random case. It is of comparable…”
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