{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,9]],"date-time":"2026-03-09T11:56:39Z","timestamp":1773057399659,"version":"3.50.1"},"reference-count":113,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2021,6,13]],"date-time":"2021-06-13T00:00:00Z","timestamp":1623542400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The use of Unmanned Aerial Vehicles (UAV) on wetlands is becoming a common survey technique that is extremely useful for understanding tidal flats and salt marshes. However, its implementation is not straightforward because of the complexity of the environment and fieldwork conditions. This paper presents the morphological evolution of the Po della Pila tidal flat in the municipality of Porto Tolle (Italy) and discusses the reliability of UAV-derived Digital Surface Models (DSMs) for such environments. Four UAV surveys were performed between October 2018 and February 2020 on an 8 ha young tidal flat that was generated, amongst others, as a consequence of the massive sediment injection into the Po Delta system due to the floods of the 1950s and 1960s. The DSM accuracy was tested by processing (i.e., photogrammetry) diverse sets of pictures taken at different altitudes during the same survey day. The DSMs and the orthophotos show that the tidal flat is characterised by several crevasse splays and that the sediment provision depends strictly on the river. During the study period, the sediment budget was positive (gaining 800 m3\/year and an average rate of vertical changes of 1.3 cm\/year). Comparisons of DSMs demonstrated that neither lower flight altitudes (i.e., 20\u2013100 m) nor the combination of more photos from different flights during the same surveys necessarily reduce the error in such environments. However, centimetric errors (i.e., RMSEs) are achievable flying at 80\u2013100 m, as the increase of GCP (Ground Control Point) density is the most effective solution for enhancing the resolution. Guidelines are suggested for implementing high-quality UAV surveys in wetlands.<\/jats:p>","DOI":"10.3390\/rs13122322","type":"journal-article","created":{"date-parts":[[2021,6,14]],"date-time":"2021-06-14T22:25:46Z","timestamp":1623709546000},"page":"2322","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Evaluating Short-Term Tidal Flat Evolution Through UAV Surveys: A Case Study in the Po Delta (Italy)"],"prefix":"10.3390","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0027-8937","authenticated-orcid":false,"given":"Riccardo","family":"Brunetta","sequence":"first","affiliation":[{"name":"Department of Physics and Earth Sciences, University of Ferrara, 44122 Ferrara, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1146-9966","authenticated-orcid":false,"given":"Enrico","family":"Duo","sequence":"additional","affiliation":[{"name":"Department of Physics and Earth Sciences, University of Ferrara, 44122 Ferrara, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7107-8185","authenticated-orcid":false,"given":"Paolo","family":"Ciavola","sequence":"additional","affiliation":[{"name":"Department of Physics and Earth Sciences, University of Ferrara, 44122 Ferrara, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2021,6,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1039","DOI":"10.1016\/S0278-4343(00)00011-X","article-title":"The classification of intertidal mudflats","volume":"20","author":"Dyer","year":"2000","journal-title":"Cont. 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