›› 2017, Vol. 29 ›› Issue (2): 204-209.DOI: 10.13679/j.jdyj.2017.2.204
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DEM of the Antarctic ice sheet plays an important role on the Antarctic environment change and the topographic study. GPS data and satellite altimetry data are two common data to construct DEM of the Antarctic ice sheet. Considering the accuracy of GPS measurement data and the spatial resolution of satellite altimetry, this paper obtains a new DEM over Dome A using SARAL and GPS data. SARAL satellite is a follow-on satellite of Envisat, which is jointly developed by Centre National d'Etudes Spatiales (CNES) and Indian Space Research Organization (ISRO). A new radar altimeter AltiKa with the Ka band was first used to reduce the influence of the ionosphere and to improve spatial resolution. The GPS data collected in 29th CHINARE Expedition over Dome A were used to evaluate the accuracy of the DEM using SARAL data. Then a new DEM used obtained by the combination of SARAL data and GPS data over Dome A. The results show that the height accuracy of the SARAL data is about 0.615 m. Moreover, it can reduce to 0.261 m after the combination between GPS data and SARAL data.
Key words: SARAL, digital elevation model (DEM), accuracy evaluation, data fusion
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URL: https://journal.chinare.org.cn/EN/10.13679/j.jdyj.2017.2.204
https://journal.chinare.org.cn/EN/Y2017/V29/I2/204