气候变化领域集成服务门户(CCPortal): Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1

CCPortal

DOI	10.5194/tc-14-1909-2020
	Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1
	Cartwright J.; Cartwright J.; Banks C.J.; Srokosz M.
发表日期	2020
ISSN	19940416
起始页码	1909
结束页码	1917
卷号	14 期号:6
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).
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
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202043
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
推荐引用方式 GB/T 7714	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],2020,14(6).
APA	Cartwright J.,Cartwright J.,Banks C.J.,&Srokosz M..(2020).Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1.Cryosphere,14(6).
MLA	Cartwright J.,et al."Improved GNSS-R bi-static altimetry and independent digital elevation models of Greenland and Antarctica from TechDemoSat-1".Cryosphere 14.6(2020).