{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,12]],"date-time":"2026-02-12T14:21:47Z","timestamp":1770906107891,"version":"3.50.1"},"reference-count":38,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2022,11,18]],"date-time":"2022-11-18T00:00:00Z","timestamp":1668729600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["42106173"],"award-info":[{"award-number":["42106173"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["2020A1515110957"],"award-info":[{"award-number":["2020A1515110957"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["59193"],"award-info":[{"award-number":["59193"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Guangdong Basic and Applied Basic Research Foundation","award":["42106173"],"award-info":[{"award-number":["42106173"]}]},{"name":"Guangdong Basic and Applied Basic Research Foundation","award":["2020A1515110957"],"award-info":[{"award-number":["2020A1515110957"]}]},{"name":"Guangdong Basic and Applied Basic Research Foundation","award":["59193"],"award-info":[{"award-number":["59193"]}]},{"name":"Dragon 5 Cooperation","award":["42106173"],"award-info":[{"award-number":["42106173"]}]},{"name":"Dragon 5 Cooperation","award":["2020A1515110957"],"award-info":[{"award-number":["2020A1515110957"]}]},{"name":"Dragon 5 Cooperation","award":["59193"],"award-info":[{"award-number":["59193"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Pumice rafts are considered to be a long-range drifting agent that promotes material exchange and the dispersal of marine species. Large ones can also interfere with vessel navigation and have a negative impact on the social economy and marine ecosystems. Synoptic observations from the Multispectral Instrument (MSI) on-board Sentinel-2, with a spatial resolution of up to 10 m, provide an excellent means to monitor and track pumice rafts. In this study, the use of a Spectral-Feature-Based Extraction (SFBE) algorithm to automatically discriminate and extract pumice on the ocean surface from submarine volcano eruptions was proposed. Specifically, a Pumice Raft Index (PRI) was developed based on the spectral signatures of pumice in MSI imagery to identify potential pumice features. After pre-processing, the PRI image was then subjected to a series of per-pixel and object-based processes to rule out false-positive detections, including shallow water, striped edges, mudflats, and cloud edges. The SFBE algorithm showed excellent performance in extracting pumice rafts and was successfully applied to extract pumice rafts near the Fiji Yasawa islands in 2019 and Hunga Tonga island in 2022, with an overall pumice extraction accuracy of 95.5% and a proportion of pixels mis-extracted as pumice of &lt;3%. The robustness of the algorithm has also been tested and proved through applying it to data and comparing its output to results from previous studies. The timely and accurate detection of pumice using the algorithm proposed here is expected to provide important information to aid in response actions and ecological assessments, and will lead to a better understanding of the fate of pumice.<\/jats:p>","DOI":"10.3390\/rs14225854","type":"journal-article","created":{"date-parts":[[2022,11,21]],"date-time":"2022-11-21T04:13:36Z","timestamp":1669004016000},"page":"5854","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Spectral Discrimination of Pumice Rafts in Optical MSI Imagery"],"prefix":"10.3390","volume":"14","author":[{"given":"Xi","family":"Chen","sequence":"first","affiliation":[{"name":"School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4802-295X","authenticated-orcid":false,"given":"Shaojie","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China"},{"name":"Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China"},{"name":"Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China"},{"name":"Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai 519000, China"}]},{"given":"Jun","family":"Zhao","sequence":"additional","affiliation":[{"name":"School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China"},{"name":"Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China"},{"name":"Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China"},{"name":"Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai 519000, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7157-8614","authenticated-orcid":false,"given":"Bin","family":"Ai","sequence":"additional","affiliation":[{"name":"School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China"},{"name":"Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China"},{"name":"Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China"},{"name":"Pearl River Estuary Marine Ecosystem Research Station, Ministry of Education, Zhuhai 519000, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"35","DOI":"10.5772\/62033","article-title":"The Synthesis and Characterization of Low-Cost Mesoporous Silica SiO2 from Local Pumice Rock","volume":"5","author":"Mourhly","year":"2015","journal-title":"Nanomater. Nanotechnol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3660","DOI":"10.1038\/ncomms4660","article-title":"On the fate of pumice rafts formed during the 2012 Havre submarine eruption","volume":"5","author":"Jutzeler","year":"2014","journal-title":"Nat. Commun."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"40","DOI":"10.1016\/j.epsl.2008.06.050","article-title":"Quenching of steam-charged pumice: Implications for submarine pyroclastic volcanism","volume":"274","author":"Allen","year":"2008","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.epsl.2018.02.025","article-title":"The pumice raft-forming 2012 Havre submarine eruption was effusive","volume":"489","author":"Manga","year":"2018","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"50","DOI":"10.1016\/j.epsl.2016.11.055","article-title":"Trapped bubbles keep pumice afloat and gas diffusion makes pumice sink","volume":"460","author":"Fauria","year":"2017","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Bryan, S.E., Cook, A.G., Evans, J.P., Hebden, K., Hurrey, L., Colls, P., Jell, J.S., Weatherley, D., and Firn, J. (2012). Rapid, long-distance dispersal by pumice rafting. PLoS ONE, 7.","DOI":"10.1371\/journal.pone.0040583"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"665","DOI":"10.1038\/347665a0","article-title":"Transport of reef corals into the Great Barrier Reef","volume":"347","author":"Jokiel","year":"1990","journal-title":"Nature"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1016\/j.epsl.2004.08.009","article-title":"Pumice rafting and faunal dispersion during 2001\u20132002 in the Southwest Pacific: Record of a dacitic submarine explosive eruption from Tonga","volume":"227","author":"Bryan","year":"2004","journal-title":"Earth Planet. Sci. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"121","DOI":"10.1016\/S0025-3227(03)00288-3","article-title":"Drift pumice at Christmas Island and Hawaii: Evidence of oceanic dispersal patterns","volume":"202","author":"Jokiel","year":"2003","journal-title":"Mar. Geol."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"5034","DOI":"10.1002\/ece3.3980","article-title":"Age and area predict patterns of species richness in pumice rafts contingent on oceanic climatic zone encountered","volume":"8","author":"Velasquez","year":"2018","journal-title":"Ecol. Evol."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"11187","DOI":"10.1038\/s41598-022-14614-y","article-title":"Coastal ecological impacts from pumice rafts","volume":"12","author":"Ohno","year":"2022","journal-title":"Sci. Rep."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Whiteside, A., Dupouy, C., Singh, A., Frouin, R., Menkes, C., and Lef\u00e8vre, J. (2021). Automatic Detection of Optical Signatures within and around Floating Tonga-Fiji Pumice Rafts Using MODIS, VIIRS, and OLCI Satellite Sensors. Remote Sens., 13.","DOI":"10.3390\/rs13030501"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"e1701121","DOI":"10.1029\/2019GL086768","article-title":"Ongoing Dispersal of the 7 August 2019 Pumice Raft From the Tonga Arc in the Southwestern Pacific Ocean","volume":"47","author":"Jutzeler","year":"2020","journal-title":"Geophys. Res. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Fauria, K., Jutzeler, M., Mittal, T., Gupta, A., Kelly, L., Rausch, J., Bennartz, R., Delbridge, B., and Retailleau, L. (2022). Simultaneous creation of a large vapor plume and pumice raft by a shallow submarine eruption. Earth Space Sci. Open Arch.","DOI":"10.1002\/essoar.10510412.1"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"111659","DOI":"10.1016\/j.rse.2020.111659","article-title":"In search of floating algae and other organisms in global oceans and lakes","volume":"239","author":"Qi","year":"2020","journal-title":"Remote Sens. Environ."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"350","DOI":"10.1016\/j.rse.2016.04.019","article-title":"Mapping and quantifying Sargassum distribution and coverage in the Central West Atlantic using MODIS observations","volume":"183","author":"Wang","year":"2016","journal-title":"Remote Sens. Environ."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2579","DOI":"10.1109\/TGRS.2020.3002929","article-title":"Automatic extraction of Sargassum features from sentinel-2 msi images","volume":"59","author":"Wang","year":"2020","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"112414","DOI":"10.1016\/j.rse.2021.112414","article-title":"Remote detection of marine debris using satellite observations in the visible and near infrared spectral range: Challenges and potentials","volume":"259","author":"Hu","year":"2021","journal-title":"Remote Sens. Environ."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"e1701121","DOI":"10.1126\/sciadv.1701121","article-title":"The largest deep-ocean silicic volcanic eruption of the past century","volume":"4","author":"Carey","year":"2018","journal-title":"Sci. Adv."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"6573","DOI":"10.1080\/01431161.2014.960613","article-title":"Remote sensing of the El Hierro submarine volcanic eruption plume","volume":"35","author":"Coca","year":"2014","journal-title":"Int. J. Remote Sens."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"106695","DOI":"10.1016\/j.jvolgeores.2019.106695","article-title":"The 6\u20138 Aug 2019 eruption of \u2018Volcano F\u2019 in the Tofua Arc, Tonga","volume":"390","author":"Brandl","year":"2020","journal-title":"J. Volcanol. Geotherm. Res."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"838532","DOI":"10.3389\/feart.2022.838532","article-title":"Pumice Raft Detection Using Machine-Learning on Multispectral Satellite Imagery","volume":"10","author":"Zheng","year":"2022","journal-title":"Front. Earth Sci."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1016\/j.rse.2019.03.010","article-title":"Adaptation of the dark spectrum fitting atmospheric correction for aquatic applications of the Landsat and Sentinel-2 archives","volume":"225","author":"Vanhellemont","year":"2019","journal-title":"Remote Sens. Environ."},{"key":"ref_24","unstructured":"Vanhellemont, Q., and Ruddick, K. (2016, January 9\u201313). Acolite for Sentinel-2: Aquatic applications of MSI imagery. Proceedings of the 2016 ESA Living Planet Symposium, Prague, Czech Republic."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/j.rse.2014.12.014","article-title":"Improvement and expansion of the Fmask algorithm: Cloud, cloud shadow, and snow detection for Landsats 4\u20137, 8, and Sentinel 2 images","volume":"159","author":"Zhu","year":"2015","journal-title":"Remote Sens. Environ."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"111205","DOI":"10.1016\/j.rse.2019.05.024","article-title":"Fmask 4.0: Improved cloud and cloud shadow detection in Landsats 4\u20138 and Sentinel-2 imagery","volume":"231","author":"Qiu","year":"2019","journal-title":"Remote Sens. Environ."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"379","DOI":"10.1016\/j.rse.2017.03.026","article-title":"Cloud detection algorithm comparison and validation for operational Landsat data products","volume":"194","author":"Foga","year":"2017","journal-title":"Remote Sens. Environ."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1016\/j.rse.2005.04.028","article-title":"Discolored seawater detection using ASTER reflectance products: A case study of Satsuma-Iwojima, Japan","volume":"99","author":"Urai","year":"2005","journal-title":"Remote Sens. Environ."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"1341","DOI":"10.1016\/j.rse.2011.01.014","article-title":"Plumes of discolored water of volcanic origin and possible implications for algal communities. The case of the Home Reef eruption of 2006 (Tonga, Southwest Pacific Ocean)","volume":"115","author":"Mantas","year":"2011","journal-title":"Remote Sens. Environ."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2118","DOI":"10.1016\/j.rse.2009.05.012","article-title":"A novel ocean color index to detect floating algae in the global oceans","volume":"113","author":"Hu","year":"2009","journal-title":"Remote Sens. Environ."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1016\/j.rse.2016.02.065","article-title":"Mapping macroalgal blooms in the Yellow Sea and East China Sea using HJ-1 and Landsat data: Application of a virtual baseline reflectance height technique","volume":"178","author":"Xing","year":"2016","journal-title":"Remote Sens. Environ."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"259","DOI":"10.1016\/0167-2789(92)90242-F","article-title":"Nonlinear total variation based noise removal algorithms","volume":"60","author":"Rudin","year":"1992","journal-title":"Phys. D Nonlinear Phenom."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"89","DOI":"10.1023\/B:JMIV.0000011321.19549.88","article-title":"An Algorithm for Total Variation Minimization and Applications","volume":"20","author":"Chambolle","year":"2004","journal-title":"J. Math. Imaging Vis."},{"key":"ref_34","first-page":"1","article-title":"Copernicus Sentinel-2 Mission: Calibration and Validation activities","volume":"14","author":"ESA","year":"2020","journal-title":"GSICS Q"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"111867","DOI":"10.1016\/j.rse.2020.111867","article-title":"Space eye on flying aircraft: From Sentinel-2 MSI parallax to hybrid computing","volume":"246","author":"Liu","year":"2020","journal-title":"Remote Sens. Environ."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2051","DOI":"10.1109\/LGRS.2015.2444871","article-title":"Extracting oil slick features from VIIRS nighttime imagery using a Gaussian filter and morphological constraints","volume":"12","author":"Wang","year":"2015","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"611","DOI":"10.4236\/ijg.2017.84033","article-title":"Accuracy assessment of land use\/land cover classification using remote sensing and GIS","volume":"8","author":"Rwanga","year":"2017","journal-title":"Int. J. Geosci."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"80","DOI":"10.1007\/s00445-021-01497-6","article-title":"Sink or float: Microtextural controls on the fate of pumice deposition during the 2012 submarine Havre eruption","volume":"83","author":"Mitchell","year":"2021","journal-title":"Bull. Volcanol."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/22\/5854\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T01:21:29Z","timestamp":1760145689000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/14\/22\/5854"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022,11,18]]},"references-count":38,"journal-issue":{"issue":"22","published-online":{"date-parts":[[2022,11]]}},"alternative-id":["rs14225854"],"URL":"https:\/\/doi.org\/10.3390\/rs14225854","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2022,11,18]]}}}