Results 21 to 30 of about 5,471 (263)

Comparison of forest attributes derived from two terrestrial lidar systems. [PDF]

, 2013
Terrestrial lidar (TLS) is an emerging technology for deriving forest attributes, including conventional inventory and canopy characterizations. However, little is known about the influence of scanner specifications on derived forest parameters.
Astrup, Rasmus, Coates, K David, Ducey, Mark J., Larson, Bruce C, Pretzsch, Hans, Seifart, Stefan   +5 more
core   +2 more sources

UAV Capability to Detect and Interpret Solar Radiation as a Potential Replacement Method to Hemispherical Photography

Remote Sensing, 2018
Solar radiation is one of the most significant environmental factors that regulates the rate of photosynthesis, and consequently, growth. Light intensity in the forest can vary both spatially and temporally, so precise assessment of canopy and potential ...
Azadeh Abdollahnejad, Dimitrios Panagiotidis, Peter Surový, Iva Ulbrichová   +3 more
doaj   +1 more source

Quantifying vegetation indices using terrestrial laser scanning: methodological complexities and ecological insights from a Mediterranean forest [PDF]

Biogeosciences, 2023
Accurate measurement of vegetation density metrics including plant, wood and leaf area indices (PAI, WAI and LAI) is key to monitoring and modelling carbon storage and uptake in forests.
W. R. M. Flynn, H. J. F. Owen, S. W. D. Grieve, S. W. D. Grieve, E. R. Lines   +4 more
doaj   +1 more source

Estimation of leaf area index in eucalypt forest with vertical foliage, using cover and fullframe fisheye photography [PDF]

, 2007
This study compared fullframe fisheye photography and cover photography with destructive leaf area index (L) estimation and the Licor LAI-2000 plant canopy analyser (PCA) in plantations of the vertical leaved species Eucalyptus globulus.
Adams, MA, Arndt, SK, Eamus, D, Edgar, AC, Livesley, SJ, Macfarlane, C, White, DA   +6 more
core   +1 more source

Dynamic Monitoring of the Standard Penetration of PHC Tubular Piles and Analysis of the Construction Effect Based on Monocular Visual Digital Photography

Applied Sciences, 2022
The penetration of large-diameter tubular piles and their relevant construction effect have significant influences on the bearing capacity of piles and nearby buildings (structures).
Guojian Zhang, Zhiyong Liu, Wei Xiong, Sifeng Zhang, Shengzhen Liu, Zhiwei Wang, Yushuai Wang   +6 more
doaj   +1 more source

Multi-contrast imaging and digital refocusing on a mobile microscope with a domed LED array [PDF]

, 2015
We demonstrate the design and application of an add-on device for improving the diagnostic and research capabilities of CellScope--a low-cost, smartphone-based point-of-care microscope.
D'Ambrosio, Michael V., Fletcher, Daniel A., Gande, Aditya V., Patel, Hurshal S., Phillips, Zachary F., Rulison, Jared J., Sadras, Nitin, Switz, Neil A., Tian, Lei, Waller, Laura   +9 more
core   +2 more sources

Methodology comparison for canopy structure parameters extraction from digital hemispherical photography in boreal forests

Agricultural and Forest Meteorology, 2005
The retrieval of canopy architectural parameters using off-the-shelf digital cameras with fish-eye lens is investigated. The technique used takes advantage of the sensor’s linear response to light of these cameras to improve the estimation of gap fraction using:
Leblanc, Sylvain G, Chen, Jing M., Fernandes, Richard, Deering, Donald w, Conley, Alexis   +4 more
openaire   +2 more sources

Measurement of Crown Cover and Leaf Area Index Using Digital Cover Photography and Its Application to Remote Sensing

Remote Sensing, 2009
Digital cover photography (DCP) is a high resolution, vertical field-of-view method for ground-based estimation of forest metrics, and has advantages over fisheye sensors owing to its ease of application and high accuracy. We conducted the first thorough
Craig Macfarlane, Burak Pekin
doaj   +1 more source

Underwater calibration of dome port pressure housings. [PDF]

, 2016
Underwater photogrammetry using consumer grade photographic equipment can be feasible for different applications, e.g. archaeology, biology, industrial inspections, etc.
FASSI, FRANCESCO, Menna, F., Nocerino, E., Remondino, F.   +3 more
core   +1 more source

LAI estimation by direct and indirect methods in Scots pine stands in Northern Steppe of Ukraine

Journal of Forest Science, 2018
Leaf area index (LAI) of Scots pine (Pinus sylvestris Linnaeus) in the Northern Steppe of Ukraine was estimated. LAI estimated directly (LAI d, destructive sampling) was compared with LAI determined by digital hemispherical photography (indirect method ...
Viktoriia LOVYNSKA, Petro LAKYDA, Svitlana SYTNYK, Mykola KHARYTONOV, Iryna PIESTOVA   +4 more
doaj   +1 more source