Journal ArticleDOI
A Simple Autocorrelation Algorithm for Determining Grain Size from Digital Images of Sediment
TLDR
Autocorrelation between pixels in digital images of sediment can be used to measure average grain size of sediment on the bed, grain-size distribution of bed sediment, and vertical profiles in grain size in a cross-sectional image through a bed as discussed by the authors.Abstract:
Autocorrelation between pixels in digital images of sediment can be used to measure average grain size of sediment on the bed, grain-size distribution of bed sediment, and vertical profiles in grain size in a cross-sectional image through a bed. The technique is less sensitive than traditional laboratory analyses to tails of a grain-size distribution, but it offers substantial other advantages: it is 100 times as fast; it is ideal for sampling surficial sediment (the part that interacts with a flow); it can determine vertical profiles in grain size on a scale finer than can be sampled physically; and it can be used in the field to provide almost real-time grain-size analysis. The technique can be applied to digital images obtained using any source with sufficient resolution, including digital cameras, digital video, or underwater digital microscopes (for real-time grain-size mapping of the bed).read more
Citations
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Journal ArticleDOI
Assessment of digital image correlation measurement errors: methodology and results
Michel Bornert,Fabrice Brémand,Pascal Doumalin,Jean-Christophe Dupré,Marina Fazzini,Michel Grédia,François Hild,Sébastien Mistou,Jérôme Molimard,Jean-José Orteu,Laurent Robert,Yves Surrel,Pierre Vacher,Bertrand Wattrisse +13 more
TL;DR: A methodology is proposed to assess the metrological performances of the image processing algorithms that constitute their main component, the knowledge of which being required for a global assessment of the whole measurement system.
Journal ArticleDOI
Large-scale dam removal on the Elwha River, Washington, USA: River channel and floodplain geomorphic change
Amy E. East,George R. Pess,Jennifer A. Bountry,Christopher S. Magirl,Andrew C. Ritchie,Joshua B. Logan,Timothy J. Randle,Mark C. Mastin,J. T. Minear,Jeffrey J. Duda,Martin Liermann,Michael L. McHenry,Timothy J. Beechie,Patrick B. Shafroth +13 more
TL;DR: The authors investigated the downstream effects of sediment released during the largest dam removal in history, on the Elwha River, Washington, USA, by measuring changes in riverbed elevation and topography, bed sediment grain size, and channel planform as two dams were removed in stages over two years.
Journal ArticleDOI
Concepts in gravel beach dynamics
TL;DR: In this article, the dominant processes in gravel beach dynamics are reviewed, highlighting some common themes which unify the various components of the gravel beach system, the repercussions of which impart on how gravel Beach dynamics might be understood conceptually.
Journal ArticleDOI
Textures of the soils and rocks at Gusev Crater from Spirit's Microscopic Imager.
Kenneth E. Herkenhoff,S. W. Squyres,Raymond E. Arvidson,D. S. Bass,James F. Bell,P. Bertelsen,N. A. Cabrol,Lisa R. Gaddis,Alexander G. Hayes,Stubbe F. Hviid,Jeffrey R. Johnson,Kjartan M. Kinch,Morten Madsen,Justin N. Maki,Scott M. McLennan,Harry Y. McSween,J. W. Rice,M. Sims,Peter H. Smith,L. A. Soderblom,N. Spanovich,Ryan C. Sullivan,Alian Wang +22 more
TL;DR: The Microscopic Imager on the Spirit rover analyzed the textures of the soil and rocks at Gusev crater on Mars at a resolution of 100 micrometers, finding rock textures consistent with a volcanic origin and subsequent alteration and/or weathering by impact events, wind, and possibly water.
Journal ArticleDOI
High-Throughput Estimation of Crop Traits: A Review of Ground and Aerial Phenotyping Platforms
Xiuliang Jin,Pablo J. Zarco-Tejada,Urs Schmidhalter,Matthew P. Reynolds,Malcolm J. Hawkesford,Rajeev K. Varshney,Tao Yang,Chengwei Nie,Zhenhai Li,Bo Ming,Yonggui Xiao,Yongdun Xie,Shaokun Li +12 more
TL;DR: Crop yields need to be improved in a sustainable manner to meet the expected worldwide increase in population over the coming decades as well as the effects of anticipated climate change; in this regard, genomics-assisted breeding has become a popular approach to food security.
References
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Book
Principles, Methods and Application of Particle Size Analysis
TL;DR: Syvitski et al. as mentioned in this paper proposed a method for grain size analysis in marine geotechnical studies using laser diffraction and suite statistics, and applied suite statistics to stratigraphy and sea-level changes.
Book ChapterDOI
Principles, methods, and application of particle size analysis: Principles and methods of geological particle size analysis
TL;DR: A detailed survey of the state-of-the-art in particle size measurement can be found in this paper, where the authors provide a detailed analysis of the properties used as measures of particle size.
Book ChapterDOI
Principles, methods, and application of particle size analysis: Laser diffraction size analysis
TL;DR: In this paper, the authors proposed a method to infer the size distributions of fine particles from the angular distribution of the intensity of forward-scattered coherent light (Cornillault, 1972; Weiss & Frock, 1976; Swithenbank et al., 1977).
Journal ArticleDOI
Automated extraction of grain-size data from gravel surfaces using digital image processing
TL;DR: The research shows that it can be used to map and quantify very rapidly spatial variations in grain-size characteristics, although it cannot deal with the longrecognised problem of the relationship between two-dimensional planformgrain-size estimates and actual a- and b- axes obtained by direct grain sampling.