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dc.contributor.authorShen, Xiaoyi
dc.contributor.authorSimilä, Markku H.
dc.contributor.authorDierking, Wolfgang Fritz Otto
dc.contributor.authorZhang, Xi
dc.contributor.authorKe, Changqing
dc.contributor.authorLiu, Meijie
dc.contributor.authorWang, Manman
dc.date.accessioned2020-01-08T12:41:54Z
dc.date.available2020-01-08T12:41:54Z
dc.date.issued2019-05-20
dc.description.abstractA new method called Bézier curve fitting (BCF) for approximating CryoSat-2 (CS-2) SAR-mode waveform is developed to optimize the retrieval of surface elevation of both sea ice and leads for the period of late winter/early spring. We found that the best results are achieved when the retracking points are fixed on positions at which the rise of the fitted Bézier curve reaches 70% of its peak in case of leads, and 50% in case of sea ice. In order to evaluate the proposed retracking algorithm, we compare it to other empirically-based methods currently reported in the literature, namely the threshold first-maximum retracker algorithm (TFMRA) and the European Space Agency (ESA) CS-2 in-depth Level-2 algorithm (L2I). The results of the retracking procedure for the different algorithms are validated using data of the Operation Ice Bridge (OIB) airborne mission. For two OIB campaign periods in March 2015 and April 2016, the mean absolute differences between freeboard values retrieved from CS-2 and OIB data were 9.22 and 7.79 cm when using the BCF method, 10.41 cm and 8.16 cm for TFMRA, and 10.01 cm and 8.42 cm for L2I. This suggests that the sea ice freeboard data can be obtained with a higher accuracy when using the proposed BCF method instead of the TFMRA or the CS-2 L2I algorithm.en_US
dc.identifier.citationShen, Similä MH, Dierking WFO, Zhang, Ke, Liu, Wang. A New Retracking Algorithm for Retrieving Sea Ice Freeboard from CryoSat-2 Radar Altimeter Data during Winter–Spring Transition . Remote Sensing. 2019;11(10):1-20en_US
dc.identifier.cristinIDFRIDAID 1719198
dc.identifier.doi10.3390/rs11101194
dc.identifier.issn2072-4292
dc.identifier.urihttps://hdl.handle.net/10037/17034
dc.language.isoengen_US
dc.publisherMDPIen_US
dc.relation.journalRemote Sensing
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2019 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleA New Retracking Algorithm for Retrieving Sea Ice Freeboard from CryoSat-2 Radar Altimeter Data during Winter–Spring Transitionen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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