DOI: 10.5194/tc-14-1909-2020
论文题名: Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1
作者: Cartwright J. ; Cartwright J. ; Banks C.J. ; Srokosz M.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 6 起始页码: 1909
结束页码: 1917
语种: 英语
英文关键词: data processing
; digital elevation model
; GNSS
; ice sheet
; remote sensing
; satellite altimetry
; satellite data
; sea ice
; Antarctica
; Grenland
; Norway
; Telemark
英文摘要: Improved digital elevation models (DEMs) of the Antarctic and Greenland ice sheets are presented, which have been derived from Global Navigation Satellite SystemsReflectometry (GNSS-R). This builds on a previous study (Cartwright et al., 2018) using GNSS-R to derive an Antarctic DEM but uses improved processing and an additional 13 months of measurements, totalling 46 months of data from the UK TechDemoSat-1 satellite. A median bias of under 10 m and root-mean-square errors (RMSEs) of under 53 m for the Antarctic and 166 m for Greenland are obtained, as compared to existing DEMs. The results represent, compared to the earlier study, a halving of the median bias to 9 m, an improvement in coverage of 18 %, and a 4 times higher spatial resolution (now gridded at 25 km). In addition, these are the first published satellite altimetry measurements of the region surrounding the South Pole. Comparisons south of 88? S yield RMSEs of less than 33 m when compared to NASA's Operation IceBridge measurements. Differences between DEMs are explored, the limitations of the technique are noted, and the future potential of GNSS-R for glacial ice studies is discussed. © 2020 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164421
Appears in Collections: 气候变化与战略
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作者单位: National Oceanography Centre, Southampton, SO14 3ZH, United Kingdom; Ocean and Earth Science, National Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, United Kingdom; National Oceanography Centre, Liverpool, L3 5DA, United Kingdom
Recommended Citation:
Cartwright J.,Cartwright J.,Banks C.J.,et al. Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1[J]. Cryosphere,2020-01-01,14(6)