{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T15:34:17Z","timestamp":1783524857154,"version":"3.55.0"},"reference-count":27,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,4,22]],"date-time":"2020-04-22T00:00:00Z","timestamp":1587513600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["DEB-1343578"],"award-info":[{"award-number":["DEB-1343578"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"name":"NASA MEaSUREs Program","award":["NNX11AQ39G"],"award-info":[{"award-number":["NNX11AQ39G"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Seasonal inundation is an important effect that governs the distribution of ecosystems in the tropics. In the Amazon Basin, the seasonal flood pulse causes a difference in high and low water levels that can exceed 15 m. The associated flood duration and extent play an important role in land-atmosphere carbon exchange and affect the ecosystem\u2019s carbon pool that originates from organic matter transported from upland and flooded forests. Studies of wetlands inundation across the Amazon Basin have utilized dual season mosaics from JERS-1 and wide-swath ScanSAR data from ALOS PALSAR to characterize inundation across the basin. This study builds upon past efforts with JERS-1 and ALOS PALSAR and uses ALOS-2 PALSAR-2 ScanSAR data to generate annual maximum and minimum inundation extent maps over the full Amazon Basin for the period spanning November 2014\u2013October 2017. The study uses decision tree classification to create a maximum and a minimum inundation extent map for each year over this time period. The results show that a generalized algorithm that fits the entire basin has an 86% overall accuracy compared with a classification made for a local region from the same PALSAR-2 datasets. Comparisons with previous full-basin inundation maps by other L-band radars shows similar results for inundated areas during maximum inundation. The maps derived previously from JERS-1 and ALOS PALSAR show 7.3% and 6.9% inundated vegetation, respectively, and this study using PALSAR-2 shows values ranging between 5.5% and 7.0% across the three study years. Comparisons between the stage data across the basin and acquisition dates\/periods for JERS-1 and PALSAR-2 show that the sensors capture the nature of the maximum and minimum flooding across the basins but have not successfully captured the exact maximum and minimum flood levels that have been recorded in the stage data. The inundation maps are publicly available under a Creative Commons (CC BY 4.0) licensefrom the Alaska Satellite Facility.<\/jats:p>","DOI":"10.3390\/rs12081326","type":"journal-article","created":{"date-parts":[[2020,4,23]],"date-time":"2020-04-23T10:46:22Z","timestamp":1587638782000},"page":"1326","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Mapping of Maximum and Minimum Inundation Extents in the Amazon Basin 2014\u20132017 with ALOS-2 PALSAR-2 ScanSAR Time-Series Data"],"prefix":"10.3390","volume":"12","author":[{"given":"Jessica","family":"Rosenqvist","sequence":"first","affiliation":[{"name":"Department of Earth and Atmospheric Sciences, The City College of the City University of New York, New York, NY 10031, USA"},{"name":"Earth and Environmental Sciences Program, The Graduate Center, The City University of New York, New York, NY 10016, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7896-502X","authenticated-orcid":false,"given":"Ake","family":"Rosenqvist","sequence":"additional","affiliation":[{"name":"solo Earth Observation (soloEO), Tokyo 104-0054, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3701-9798","authenticated-orcid":false,"given":"Katherine","family":"Jensen","sequence":"additional","affiliation":[{"name":"Department of Earth and Atmospheric Sciences, The City College of the City University of New York, New York, NY 10031, USA"},{"name":"Earth and Environmental Sciences Program, The Graduate Center, The City University of New York, New York, NY 10016, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8911-6576","authenticated-orcid":false,"given":"Kyle","family":"McDonald","sequence":"additional","affiliation":[{"name":"Department of Earth and Atmospheric Sciences, The City College of the City University of New York, New York, NY 10031, USA"},{"name":"Earth and Environmental Sciences Program, The Graduate Center, The City University of New York, New York, NY 10016, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,22]]},"reference":[{"key":"ref_1","first-page":"110","article-title":"The flood pulse concept in river-floodplain systems","volume":"106","author":"Junk","year":"1989","journal-title":"Can. Spec. Publ. Fish. Aquat. Sci."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Junk, W.J., Piedade, M.T., Wittmann, F., Sch\u00f6ngart, J., and Parolin, P. (2010). Amazonian Floodplain Frests: Ecophysiology, Biodiversity and Sustainable Management, Springer Science & Business Media.","DOI":"10.1007\/978-90-481-8725-6"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"209","DOI":"10.1016\/j.rse.2006.11.012","article-title":"Mapping of flood dynamics and spatial distribution of vegetation in the Amazon floodplain using multitemporal SAR data","volume":"108","author":"Martinez","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"617","DOI":"10.1038\/416617a","article-title":"Outgassing from Amazonian rivers and wetlands as a large tropical source of atmospheric CO2","volume":"416","author":"Richey","year":"2002","journal-title":"Nature"},{"key":"ref_5","unstructured":"MacDonald, H., Waite, W., and Demarcke, J. (1981). Use of Seasat Satellite Radar Imagery for the Detection of Standing Water Beneath Forest Vegetation, NASA."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1375","DOI":"10.1080\/014311600210227","article-title":"The global rain forest mapping project-a review","volume":"21","author":"Rosenqvist","year":"2000","journal-title":"Int. J. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1447","DOI":"10.1080\/01431160110092975","article-title":"The JERS-1 Amazon Multi-season Mapping Study (JAMMS): Science objectives and implications for future missions","volume":"23","author":"Freeman","year":"2002","journal-title":"Int. J. Remote Sens."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"637","DOI":"10.1109\/JSTARS.2010.2077619","article-title":"Generating large-scale high-quality SAR mosaic datasets: Application to PALSAR data for global monitoring","volume":"3","author":"Shimada","year":"2010","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"404","DOI":"10.1016\/j.rse.2003.04.001","article-title":"Dual-season mapping of wetland inundation and vegetation for the central Amazon basin","volume":"87","author":"Hess","year":"2003","journal-title":"Remote Sens. Environ."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"745","DOI":"10.1007\/s13157-015-0666-y","article-title":"Wetlands of the lowland Amazon basin: Extent, vegetative cover, and dual-season inundated area as mapped with JERS-1 synthetic aperture radar","volume":"35","author":"Hess","year":"2015","journal-title":"Wetlands"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Melack, J.M., and Hess, L.L. (2010). Remote Sensing of the Distribution and Extent of Wetlands in the Amazon Basin. Amazonian Floodplain Forests, Springer.","DOI":"10.1007\/978-90-481-8725-6_3"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"5440","DOI":"10.3390\/rs70505440","article-title":"Mapping regional inundation with spaceborne L-band SAR","volume":"7","author":"Chapman","year":"2015","journal-title":"Remote Sens."},{"key":"ref_13","unstructured":"(2020, April 16). NASA Earth System Data Record (ESDR) at the Alaska Satellite Facility Distributed Active Archive Center (DAAC). Available online: https:\/\/asf.alaska.edu\/data-sets\/derived-data-sets\/wetlands-measures\/."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1303","DOI":"10.1080\/01431160110092911","article-title":"The use of spaceborne radar data to model inundation patterns and trace gas emissions in the central Amazon floodplain","volume":"23","author":"Rosenqvist","year":"2002","journal-title":"Int. J. Remote Sens."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/j.rse.2012.10.035","article-title":"Monitoring flood extent in the lower Amazon River floodplain using ALOS\/PALSAR ScanSAR images","volume":"130","author":"Arnesen","year":"2013","journal-title":"Remote Sens. Environ."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Jensen, K., McDonald, K., Podest, E., Rodriguez-Alvarez, N., Horna, V., and Steiner, N. (2018). Assessing L-band GNSS-reflectometry and imaging radar for detecting sub-canopy inundation dynamics in a tropical wetlands complex. Remote Sens., 10.","DOI":"10.3390\/rs10091431"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"560","DOI":"10.1109\/JSTARS.2010.2089042","article-title":"Using ALOS\/PALSAR and RADARSAT-2 to Map Land Cover and Seasonal Inundation in the Brazilian Pantanal","volume":"3","author":"Evans","year":"2010","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1283","DOI":"10.1080\/01431160110092902","article-title":"Evaluation of the JERS-1 SAR mosaics for hydrological applications in the Congo River basin","volume":"23","author":"Rosenqvist","year":"2002","journal-title":"Int. J. Remote Sens."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1805","DOI":"10.5194\/hess-16-1805-2012","article-title":"Flood occurrence mapping of the middle Mahakam lowland area using satellite radar","volume":"16","author":"Hidayat","year":"2012","journal-title":"Hydrol. Earth Syst. Sci."},{"key":"ref_20","unstructured":"(2020, April 16). ALOS-2 PALSAR-2 Basic Observation Scenatio website, Japan Aerospace Exploration Agency. Available online: www.eorc.jaxa.jp\/ALOS-2\/en\/obs\/pal2_obs_guide.htm."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1016\/j.rse.2014.04.011","article-title":"Operational performance of the ALOS global systematic acquisition strategy and observation plans for ALOS-2 PALSAR-2","volume":"155","author":"Rosenqvist","year":"2014","journal-title":"Remote Sens. Environ."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Rosenqvist, A., Rebelo, L.M., and Costa, M. (2015). The ALOS Kyoto & Carbon Initiative: Enabling the mapping, monitoring and assessment of globally important wetlands. Wetl. Ecol. Manag., 23.","DOI":"10.1007\/s11273-014-9400-4"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1029\/EO081i048p00583","article-title":"Shuttle Radar Topography Mission produces a wealth of data","volume":"81","author":"Farr","year":"2000","journal-title":"Eostrans. Am. Geophys. Union"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1016\/j.isprsjprs.2017.10.012","article-title":"Breaking new ground in mapping human settlements from space\u2013The Global Urban Footprint","volume":"134","author":"Esch","year":"2017","journal-title":"Isprs J. Photogramm. Remote Sens."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Arino, O. (2007). GlobCover: ESA service for global land cover from MERIS. IEEE Int. Geosci. Remote Sens. Symp. (Igarss\u201907), Barc, 2412\u20132415.","DOI":"10.1109\/IGARSS.2007.4423328"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"651","DOI":"10.5194\/essd-8-651-2016","article-title":"An explicit GIS-based river basin framework for aquatic ecosystem conservation in the Amazon","volume":"8","author":"Venticinque","year":"2016","journal-title":"Earth Syst. Sci. Data"},{"key":"ref_27","unstructured":"(2020, April 16). Hidroweb, Ag\u00eancia Nacional de \u00c1guas, Available online: http:\/\/www.snirh.gov.br\/hidroweb\/publico\/apresentacao.jsf."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/8\/1326\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,13]],"date-time":"2025-10-13T13:23:32Z","timestamp":1760361812000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/12\/8\/1326"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,22]]},"references-count":27,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2020,4]]}},"alternative-id":["rs12081326"],"URL":"https:\/\/doi.org\/10.3390\/rs12081326","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,4,22]]}}}