Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"hemispherical photography"”.
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Initial Assessment of Canopy Fuel Factors in Forested Areas of the Netherlands
… and canopy bulk density were estimated using hemispherical photography, LI-COR LAI 2200c Plant Canopy Analyzer, spherical densiometer and allometeric methods. The crown allometry data collected was species, density (trees per ha), condition (live vs. dead), diameter breast height (DBH), …
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The Effects of Prescribed Burning by the National Park Service on Pine -Oak Forests Within Great Smoky Mountains National Park
… effectiveness in achieving management goals. Hemispherical photography analysis quantified the impact of burning on available light reaching the forest floor with the global site factor (GSF), the percentage of total above-the-canopy light reaching the forest floor. A site which received a …
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Estimation of biophysical properties of woodland canopies using LiDAR and hyperspectral imagery
… laserscanner (TLS) and upward-looking hemispherical photography. Comparison between theplot-based and TLS-based estimates of tree height and canopy cover showed that the TLScould be used to rapidly and accurately measure tree height, but measurements ofcanopy cover were less reliable. A …
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Quantifying structural change in UK woodland canopies with a dual-wavelength full-waveform terrestrial laser scanner
… monitoring experiment using SALCA and hemispherical photography at Delamere Forest in five different plots (to address Objective 3).Key findings relating to Objective 1 have highlighted the complexities of SALCA intensity response, such as the effect of internal temperature. As a …
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The effect of light-limitation on spinescent structural defence and its implications on resistance to herbivory in the shade
… Light condition of plants was determined using hemispherical photography. Spine efficiency of sun and shade plants was determined using a bite test and was evaluated using architectural and physiological analyses. Architectural analysis involved identifying levels of organisation within the …
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Influence of the thermal environment on forest cover selection and activity of moose in summer
… selection and activity of moose (Alces alces). Hemispherical photography was used to estimate the sky view factor (SVF) and effective leaf area index (Le) of coniferous stands as a function of crown closure class (CCC) values from forest cover maps. Moosehorn readings taken at hemispherical …
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The Influence of Overstory Structure on Understory Light Availability in a Longleaf Pine (Pinus palustris Mill.) Forest
… decreasing solar altitude (ie season change). Hemispherical photographs used to estimate weighted canopy openness and gap fraction were effective methods, but gap light index (GLI) also derived from hemispherical photographs performed better. Accuracy of daily %PPFD estimates using …