气候变化领域集成服务门户(CCPortal): Interferometric swath processing of Cryosat data for glacial ice topography

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DOI	10.5194/tc-7-1857-2013
	Interferometric swath processing of Cryosat data for glacial ice topography
	Gray L.; Burgess D.; Copland L.; Cullen R.; Galin N.; Hawley R.; Helm V.
发表日期	2013
ISSN	19940416
卷号	7 期号:6
英文摘要	We have derived digital elevation models (DEMs) over the western part of the Devon Ice Cap in Nunavut, Canada, using "swath processing" of interferometric data collected by Cryosat between February 2011 and January 2012. With the standard ESA (European Space Agency) SARIn (synthetic aperture radar interferometry) level 2 (L2) data product, the interferometric mode is used to map the cross-track position and elevation of the "point-of- closest-approach" (POCA) in sloping glacial terrain. However, in this work we explore the extent to which the phase of the returns in the intermediate L1b product can also be used to map the heights of time-delayed footprints beyond the POCA. We show that there is a range of average cross-track slopes (~ 0.5 to ~ 2°) for which the returns will be dominated by those beneath the satellite in the main beam of the antenna so that the resulting interferometric phase allows mapping of heights in the delayed range window beyond the POCA. In this way a swath of elevation data is mapped, allowing the creation of DEMs from a sequence of L1b SARIn Cryosat data takes. Comparison of the Devon results with airborne scanning laser data showed a mean difference of order 1 m with a standard deviation of about 1 m. The limitations of swath processing, which generates almost 2 orders of magnitude more data than traditional radar altimetry, are explored through simulation, and the strengths and weaknesses of the technique are discussed. © Author(s) 2013. CC Attribution 3.0 License.
学科领域	CryoSat-2; digital elevation model; radar interferometry; satellite altimetry; satellite data; swath bathymetry; synthetic aperture radar; topographic mapping; Canada; Devon Ice Cap; Nunavut
语种	英语
scopus关键词	CryoSat-2; digital elevation model; radar interferometry; satellite altimetry; satellite data; swath bathymetry; synthetic aperture radar; topographic mapping; Canada; Devon Ice Cap; Nunavut
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/120228
作者单位	Department of Geography, University of Ottawa, Ottawa, Canada; Geological Survey of Canada, NRCan, Ottawa, Canada; Vega Space Ltd., Hertfordshire, United Kingdom; Laboratory for Satellite Altimetry, NOAA, MD 20740, United States; Department of Earth Sciences, Dartmouth College, Hanover, NH, United States; Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany
推荐引用方式 GB/T 7714	Gray L.,Burgess D.,Copland L.,et al. Interferometric swath processing of Cryosat data for glacial ice topography[J],2013,7(6).
APA	Gray L..,Burgess D..,Copland L..,Cullen R..,Galin N..,...&Helm V..(2013).Interferometric swath processing of Cryosat data for glacial ice topography.Cryosphere,7(6).
MLA	Gray L.,et al."Interferometric swath processing of Cryosat data for glacial ice topography".Cryosphere 7.6(2013).