Blar i forfatter "Zhang, Xi"

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    • A New Retracking Algorithm for Retrieving Sea Ice Freeboard from CryoSat-2 Radar Altimeter Data during Winter–Spring Transition 

      Shen, Xiaoyi; Similä, Markku H.; Dierking, Wolfgang Fritz Otto; Zhang, Xi; Ke, Changqing; Liu, Meijie; Wang, Manman (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-05-20)
      A 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 ...

    • Results of the Dragon 4 Project on New Ocean Remote Sensing Data for Operational Applications 

      Gibert, Ferran; Boutin, Jacqueline; Dierking, Wolfgang Fritz Otto; Granados, Alba; Li, Yan; Makhoul, Eduard; Meng, Junmin; Supply, Alexandre; Vendrell, Ester; Vergely, Jean-Luc; Wang, Jin; Yang, Jungang; Xiang, Kunsheng; Yin, Xiaobin; Zhang, Xi (Journal article; Tidsskriftsartikkel, 2021-07-20)
      This paper provides an overview of the Dragon 4 project dealing with operational monitoring of sea ice and sea surface salinity (SSS) and new product developments for altimetry data. To improve sea ice thickness retrieval, a new method was developed to match the Cryosat-2 radar waveform. Additionally, an automated sea ice drift detection scheme was developed and tested on Sentinel-1 data, and the ...