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In this work, we compared six emerging mobile laser scanning (MLS) technologies for field reference data collection at the individual tree level in boreal forest conditions. The systems under study were an in-house developed AKHKA-R3 backpack laser scanner, a handheld Zeb-Horizon laser scanner, an under-canopy UAV (Unmanned Aircraft Vehicle) laser scanning system, and three above-canopy UAV.
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The advantage of such concept is that the aerial perspective from the above-canopy UAV and the terrestrial perspective from the under-canopy UAV can be seamlessly integrated in one flight, thus grants the access to simultaneous high completeness, high efficiency, and low cost. Results
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Forest canopies are incredibly complex self-maintaining biological structures. Conditions above and within the canopy can differ vastly, often resulting in a vertical gradient of microclimate conditions. Canopy epiphytic plants have to deal with climatic variability on much more variable scales compared to many other plant groups. The difficulty of sensor installation and their high cost can.
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Daily average exchange of CO 2 above and below the canopy during the years 2019-2020 (on the left) and averaged diurnal patterns covering the years 2019-2020 (on the right). u* two-level filtering.
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The above-canopy UAV systems provide high-density point clouds of high positional accuracy since GNSS-positioning provides high absolute accuracy (2-5 cm) above the canopy. On the other hand, terrestrial point clouds, which have a high local accuracy, a high density, and a low point-cloud-to-point-cloud variation, are another optimal element for characterizing lower parts of the forest.
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Coupling between motions above the canopy (z/h=1.5, whereh is canopy height) and within the canopy (z/h=0.6) are studied using composite velocity and temperature fields constructed from 85 hours.
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Above-canopy (AC) measurements were conducted at 30 m height. Below-canopy (or subcanopy) measurements were conducted at the 'Below Canopy #1′ (BC1) and 'Below Canopy #2′ (BC2) towers at 2 m height. Only ET is directly measured by the EC method, not the component fluxes of transpiration (T) of plant xylem water and evaporation (E) of.
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The above-canopy wind speed is the critical input to the wind and flux components of the model, together with other inputs of air temperature, humidity, solar radiation, and precipitation that drive other aspects of the model. At Niwot Ridge the above-canopy measurements of the wind speed were used to drive the model.
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We validated both modes of the model with empirical below-canopy thermal measurements from several locations globally, resulting in hourly predictions with mean absolute error of 2.77 °C and 2.79 °C for the transient and steady-state modes respectively.
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Polycarbonate canopy roofing material is an inherently clear thermoplastic that transmits light practically as efficiently as glass. It is also extremely strong and impact-resistant, making it almost unbreakable. However, polycarbonate can also be translucent, opaque, or colored. It has a maximum survival rate of 25 years.
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Draft 1 1 Biogeochemical responses to multi-year above-canopy applications of 2 nitrogen at a jack pine (Pinus banksiana Lamb.) forest in northern Alberta, 3 Canada. 4 5 Andrew M. McDonougha*, Shaun A. Watmoughb, Adam W. Birdc, 6 7 a Ontario Ministry of the Environment, Conservation and Parks. 125 Resources Road, Toronto 8 Ontario Canada, MP9 3V6. 9 10 b Trent University School of the.
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above-canopy UAV observations, which is a promising step forward to achieve a fully autonomous in situ forest inventory. Future studies should be aimed to further improve the platform positioning, and to automatize the UAV operation. Keywords: Forest, In situ, Inventory, Above canopy, Under canopy, Unmanned aerial vehicle, Laser scanning, Point
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Biogeochemical responses to multiyear above-canopy applications of nitrogen at a jack pine ( Pinus banksiana) forest in northern Alberta, Canada Authors: Andrew M. McDonough, Shaun A. Watmough, and Adam W. Bird Authors Info & Affiliations Publication: Canadian Journal of Forest Research 18 October 2022 https://doi.org/10.1139/cjfr-2022-0041
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Using the under-canopy flying UAV, we collected SLAM-corrected point cloud data in a boreal forest on two 32 m ×32 m test sites that were characterized as sparse (n= 42 trees) and obstructed (n= 43 trees), respectively.
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Current automated forest investigation is facing a dilemma over how to achieve high tree- and plot-level completeness while. The European Environmental Agency defines a forest as a treed area with trees higher than 5 m and a canopy cover above 30% 86: in the present study, forested areas were associated with the.
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