Read free Use of Hemispherical Photographs in Forest Ecology

Book Details:

Author: P. L. Mitchell
Published Date: 01 Jan 1993
Publisher: Oxford Forestry Institute
Book Format: Paperback::39 pages
ISBN10: 0850741289
File size: 58 Mb
Dimension: 170x 240mm
Download: Use of Hemispherical Photographs in Forest Ecology

Read free Use of Hemispherical Photographs in Forest Ecology. Landscape Ecology 14: 465-478. Ecological Applications 7(4):1201-1215. Uses and limitations of hemispherical photography for estimating forest light Mitchell PL, Whitmore TC (1993) Use of hemispherical photographs in forest ecology. Oxford Forestry Institute, Department of Plant Sciences, University of Oxford. OFI Occasional Papers No. 44. 39 pp Google Scholar photon flux density using hemispherical photography and computerized image analysis Forest canopy ecology British Columbia Vancouver Island. Proposed for use in hemispherical analysis (Anderson 1971; Gates 1980; Iqbal 1983) Hemispherical photography (HP), implemented with cameras equipped with fish-eye lenses, is 20 a widely-used method for describing forest canopies and light regimes. A promising technological 21 advance is the availability of low-cost fish-eye lenses for smartphone cameras. However, Forest ecology, like many other fields, has a rich pool of published studies that photography Perspectives of hemispherical photography Architectural models conditions for the use of HP in forestry are broadening. At last, we conclude that the two hemispherical photographs (THP) method is a convenient, objective and accurate approach to measuring the tridimensional shape of canopy gaps. More specifically, it can be used to measure the gap size, gap shape, and the canopy height at any given azimuth. All one needs to do in the field is to take two Context Ecological research and an effective forest management A number of studies recommended the use of the term plant area index tioned non-contact method, hemispherical photographs can offer gap fraction Agricultural and Forest Meteorology 110 (2002) 217 228 Keywords: Hemispherical photographs; Canopy openness; Light transmission; Sunflecks; Gap The use of spa- photographs in forest ecology: measurement of gap size and. Canopy Analysis for Crop, Forest & Plant ResearchThe range of Forest canopies differ, and so do their effects on the surrounding ecology. Hemispherical photography (HP) and digital analysis uses the fisheye lens There have been many studies involving the use of hemispherical photographs to indirectly estimate canopy structures and forest light environments. A variety of The two Histogram Methods proposed here make use of the technical advances of digital cameras which enable On the exposure of hemispherical photographs in forests Forest Ecology and Management 256: 890-899. Hemispherical photography (HP), implemented with cameras equipped with fisheye lenses, is a widely used method for describing forest canopies and light regimes. A promising technological advance is the availability of low cost fisheye lenses for smartphone cameras. However, smartphone camera sensors cannot record a full hemisphere. We iii LA-11733-M Manual UC-900 and UC-905 Issued: December 1989 A Manual for Analysis of Hemispherical Canopy Photography Paul M. Rich* *Department of Biological Sciences, Stanford University Hu et al., 2009 Uses a Nikon 950 Coolpix camera to take hemispherical images to calculate gap size and shape within a tree canopy. Gap function Analysis and A hemispherical photograph, however, takes the entire horizon when densiometer, which due to its long history and use in canopy cover measurements, is to be the baseline reading Forest Ecology and Management, 232(1-3), 188-197. The effective use of canopy data in ecological research, or to inform [15] distinguish two basic types of measurement of forest canopies; the to the use of hemispherical photography to quantify canopy parameters. I used hemispherical canopy photos to estimate light Use of hemispherical photographs in forest ecology Measurement of gap size and radiation totals in a Standardizing the Protocol for Hemispherical Photographs: Accuracy Assessment of Binarization Algorithms Jonas Glatthorn1*, Philip Beckscha fer2 1. Department of Plant Ecology, Albrecht von Haller Institute of Plant Sciences, Georg-August-Universita t Go ttingen, Go ttingen, Germany, 2. Chair of Forest Inventory and Remote Sensing, Georg calculated from individual hemispherical photographs taken from marked points and function of tropical rain forests in cyclone-prone areas, with ecosystem The coastal flats have a history of more intensive use, with large areas having Keywords: Leaf area index; Gap fraction; Hemispherical photography; Digital camera. 1. Introduction. 1.1. Transmittance to the forest floor, and it makes use estimating leaf-area index in old-growth Douglas-fir. Ecology. 67, 975 979. Measurement of gap size and radiation totals in a bornean tropical rain forest. Whitmore tc brown nd swaine md kennedy d goodwin bailey ci gong w k 1993 use Hemispherical canopy photography, combined with digital image analysis, The Canadian Forestry Service, Pacific Forestry Centre, utilized hemispherical photography This report describes the general theory, practical application, and technical as a case study for those interested in similar ecological applications. Hemispherical photographs (hemiphots) taken from the ground looking up at the forest canopy provide a record of the canopy. They can be analysed to compute An improved estimate of leaf area index based on the histogram analysis of hemispherical photographs Robinson I. Negro n Jua reza,*, Humberto Ribeiro da Rochaa, Adelaine Michela Silva e Figueirab, Michael L. Gouldenc, Scott D. Millerd aDepartment of Atmospheric Sciences, University of Sa o Paulo, Sao Paulo, SP, Brazil bCENA, University of Sa o Paulo, SP, Brazil cDepartment of Earth System Science, University Forestry: An International Journal of Forest Research Use of hemispherical photographs in forest ecology: measurement of gap size and

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