{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,24]],"date-time":"2026-10-24T16:09:53Z","timestamp":1792858193148,"version":"4.5.0"},"reference-count":28,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2017,3,7]],"date-time":"2017-03-07T00:00:00Z","timestamp":1488844800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"COST Action","award":["ES1306"],"award-info":[{"award-number":["ES1306"]}]},{"DOI":"10.13039\/501100001824","name":"Czech Science Foundation","doi-asserted-by":"publisher","award":["13-32133S"],"award-info":[{"award-number":["13-32133S"]}],"id":[{"id":"10.13039\/501100001824","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Czech Academy of Science","award":["RVO 67985891"],"award-info":[{"award-number":["RVO 67985891"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>This paper presents a new non-invasive technique of granulometric analysis based on the fusion of two imaging techniques, Unmanned Aerial Vehicles (UAV)-based photogrammetry and optical digital granulometry. This newly proposed technique produces seamless coverage of a study site in order to analyze the granulometric properties of alluvium and observe its spatiotemporal changes. This proposed technique is tested by observing changes along the point bar of a mid-latitude mountain stream. UAV photogrammetry acquired at a low-level flight altitude (at a height of 8 m) is used to acquire ultra-high resolution orthoimages to build high-precision digital terrain models (DTMs). These orthoimages are covered by a regular virtual grid, and the granulometric properties of the grid fields are analyzed using the digital optical granulometric tool BaseGrain. This tested framework demonstrates the applicability of the proposed method for granulometric analysis, which yields accuracy comparable to that of traditional field optical granulometry. The seamless nature of this method further enables researchers to study the spatial distribution of granulometric properties across multiple study sites, as well as to analyze multitemporal changes using repeated imaging.<\/jats:p>","DOI":"10.3390\/rs9030240","type":"journal-article","created":{"date-parts":[[2017,3,7]],"date-time":"2017-03-07T11:12:32Z","timestamp":1488885152000},"page":"240","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":50,"title":["UAV-Based Optical Granulometry as Tool for Detecting Changes in Structure of Flood Depositions"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4039-2187","authenticated-orcid":false,"given":"Jakub","family":"Langhammer","sequence":"first","affiliation":[{"name":"Department of Physical Geography and Geoecology, Faculty of Science, Charles University in Prague, Albertov 6, 12843 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theodora","family":"Lendzioch","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Geoecology, Faculty of Science, Charles University in Prague, Albertov 6, 12843 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jakub","family":"Mi\u0159ijovsk\u00fd","sequence":"additional","affiliation":[{"name":"Department of Geoinformatics, Palacky University in Olomouc, 17. listopadu 50, 77146 Olomouc, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Filip","family":"Hartvich","sequence":"additional","affiliation":[{"name":"Department of Physical Geography and Geoecology, Faculty of Science, Charles University in Prague, Albertov 6, 12843 Prague, Czech Republic"},{"name":"Institute of Rock Structure and Mechanics, Academy of Sciences, V Hole\u0161ovi\u010dk\u00e1ch 94\/41, 18209 Prague, Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2017,3,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Bunte, K., and Abt, S.R. (2001). Sampling Surface and Subsurface Particle-Size Distributions in Wadable Gravel-and Cobble-Bed Streams for Analyses in Sediment Transport, Hydraulics, and Streambed Monitoring.","DOI":"10.2737\/RMRS-GTR-74"},{"key":"ref_2","unstructured":"Church, M.A., McLean, D.G., and Wolcott, J.F. (1987). River Bed Gravels: Sampling and Analysis. Sediment Transport in Gravel-Bed Rivers, John Wiley and Sons."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1111\/j.1365-3091.1966.tb01572.x","article-title":"A review of grain-size parameters","volume":"6","author":"Folk","year":"1966","journal-title":"Sedimentology"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1007\/s11004-005-8745-x","article-title":"Automated Sizing of Coarse-Grained Sediments: Image-Processing Procedures","volume":"37","author":"Graham","year":"2005","journal-title":"Math. 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