DOI: 10.5194/tc-7-1857-2013
Scopus记录号: 2-s2.0-84890506099
论文题名: Interferometric swath processing of Cryosat data for glacial ice topography
作者: Gray L ; , Burgess D ; , Copland L ; , Cullen R ; , Galin N ; , Hawley R ; , Helm V
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 6 起始页码: 1857
结束页码: 1867
语种: 英语
英文关键词: CryoSat-2
; digital elevation model
; radar interferometry
; satellite altimetry
; satellite data
; swath bathymetry
; synthetic aperture radar
; topographic mapping
; Canada
; Devon Ice Cap
; Nunavut
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74918
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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
Recommended Citation:
Gray L,, Burgess D,, Copland L,et al. Interferometric swath processing of Cryosat data for glacial ice topography[J]. Cryosphere,2013-01-01,7(6)