Application of digital photography and geographical information system at the sediment grain-size distribution analyis
1997
Kostka, Z. (Slovenska Akademia Vied, Liptovsky Mikulas (Slovak Republic). Ustav Hydrologie)
Photographic analysis of gravel beds applying digital image processing using geographical information systems and the relation between grain size obtained by volumetric mesh analysis and grain size from photographic analysis is presented. Digital images of the gravel bed, taken with camera and scanned, or taken directly with a digital camera, are rectified to remove errors of optical distortion and the grain size is then measured using the grid-by-number method which is equivalent to standard volume-by-weight mesh analysis. Photographic analysis was applied at Bela and Jalovecky potok gravel-bed streams and the results were compared to template analysis made in situ on some samples. Reference measurements indicated that the proposed method is suitable and operative in the gravel-bed rivers roughness determination. The accurancy can be improved by carrying out some calibrating measurements in the study area
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