Li, F; Guo, YX; Zhang, Y; Zhu, TT; Zhang, SK (2020). Grounding line extraction in the Amery ice shelf, Antarctic using fusion of CryoSat-2 altimetry data and Landsat 8 optical data. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION, 63(11), 3981-3995.

In this work, fusion of CryoSat-2 altimetry data and Landsat 8 data is applied to grounding line extraction in the Amery ice shelf area, Antarctic. Firstly, based on the 3-order Hermit polynomial interpolation processing of Landsat 8 optical images, the slope analysis is carried out to obtain the revised feature points using surface curvature. For the Cryosat-2 data, grounding point is extracted by using the along track gradient analysis after slope and surface curvature calculation. Finally, the least squares based fusion method is utilized to obtain the fusion grounding line. The results show that the fusion grounding line can guarantee the accuracy compared with optical data results, and the altimetry data are not affected by the cloud that can ensure the integrity of the grounding line. Compared with the Mosaic of Antarctica (MOA) product, the average distance between the fusion data points and the MOA grounding line is 367 m, and the standard deviation is 601 m. Points less than 1 km away from all data points account for 93.19% in total, which indicates the good agreement with the MOA product. The fusion algorithm maintains the grounding line characteristics extracted by Landsat 8, and the visual performance of overall results are also improved. It is of great importance for subsequent research on the Antarctic mass balance, ice velocity calculation and so on.