A comparison of digital and film fisheye photography for analysis of forest canopy structure and gap light transmission

By G. Frazer, Richard A. Fournier, J. A. Trofymow, R. Hall. 2001

341 citations recorded by the source corpus.

Subfields: Ecological Modeling, Ecology, Environmental Engineering

View Paper: https://www.semanticscholar.org/paper/1068733738c4aad9d4a69e13181a3e39d75bdbfa

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Citations in the corpus

Indirect estimates of canopy gap fraction based on the linear conversion of hemispherical photographs Methodology and comparison with standard thresholding techniques (2007, background): “Till now, the numerous authors who compared the two techniques have not pointed out this fundamental difference (e.g. Englund et al., 2000; Frazer et al., 2001; Hale and Edwards, 2002), even though the correction of the non-linearity in film cameras has been carefully discussed by Wagner (1998).”
Estimation of leaf area and clumping indexes of crops with hemispherical photographs (2008, methodology): “Others, such as MVI (Multiband Vegetation Imager; Kucharik et al., 1997) or hemispherical photographs (Rich, 1990; Frazer et al., 2001a), provide canopy gap fraction from image analysis.”
Modelling radiation fluxes in simple and complex environments: basics of the RayMan model (2007, methodology): “There are many existing methods for its calculation (JohnsonandWatson1984; Watson and Johnson 1987, 1988; Becker et al. 1989; Chen and Black 1991 ;H olmer1992; Rich et al. 1993; Chapman et al. 2001; Frazer et al. 2001; Pereira et al. 2001 ;H olmer et al.2001).”
Modelling radiation fluxes in simple and complex environments—application of the RayMan model (2007, methodology): “There are many existing methods for its calculation (Johnson andWatson 1984; Watson and Johnson 1987, 1988; Becker et al. 1989; Chen and Black 1991; Holmer 1992; Rich et al. 1993; Chapman et al. 2001; Frazer et al. 2001; Pereira et al. 2001; Holmer et al. 2001).”
Estimating leaf area index in different types of mature forest stands in Switzerland: a comparison of methods (2010, background): “Frazer et al. (2001) particularly complained about some colour blurring on their photographs.”
CANOPY STRUCTURE, MICROCLIMATE, AND HABITAT SELECTION BY A NOCTURNAL SNAKE, HOPLOCEPHALUS BUNGAROIDES (2003, positive): “All exposures used the camera’s self-timer to minimize camera shake and were recorded in black and white to minimize chromatic aberration (Frazer et al. 2001).”
Leaf area index estimation in mountain even-aged Pinus silvestris L. stands from hemispherical photographs (2007, methodology): “Recent technological advances, such as the use of high resolution digital cameras (Frazer et al., 2001), the development of software packages or the new advances in image processing, such as automatic thresholding for separating canopy and sky in the image (Nobis and Hunziker, 2005), might improve t”
Ground-based measurements of leaf area index: a review of methods, instruments and current controversies. (2003, methodology): “To date, few published data are available to assess the performance of digital pictures compared with classical ones from ®lm (Frazer et al., 2001).”
Estimating forest canopy bulk density using six indirect methods (2005, background): “Hemispherical photography (hemiphoto) is gaining popularity for the computation of leaf area and the exploration of canopy light dynamics (Neumann et al. 1989; Englund et al. 2000; Frazer et al. 2001).”