Topography and penetration of the Greenland ice sheet measured with airborne SAR interferometry

被引:60
作者
Dall, J
Madsen, SN
Keller, K
Forsberg, R
机构
[1] Tech Univ Denmark, Dept Electromagnet Syst, DCRS, DK-2800 Lyngby, Denmark
[2] Natl Survey & Cadastre, KMS, Geodynam Dept, DK-2400 Copenhagen NV, Denmark
关键词
Digital elevation model (DEM);
D O I
10.1029/2000GL011787
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A digital elevation model (DEM) of the Geikie ice sap in East Greenland has been generated from interferometric C-band synthetic aperture radar (SAR) data acquired with the airborne EMISAR system. GPS surveyed radar reflectors and an airborne laser altimeter supplemented the experiment. The accuracy of the SAR DEM is about 1.5 m. The mean difference between the laser heights and the SAR heights changes from 0 m in the soaked zone to a maximum of 13 m in the percolation zone. This is explained by the fact that the snow in the soaked zone contains liquid water which attenuates the radar signals, while the transparency of the firn in the percolation zone makes volume scattering dominate at the higher elevations. For the first time, the effective penetration has been measured directly as the difference between the interferometric heights and reference heights obtained with GPS and laser altimetry.
引用
收藏
页码:1703 / 1706
页数:4
相关论文
共 15 条
[1]   The accuracy of satellite radar altimeter data over the Greenland ice sheet determined from airborne laser data [J].
Bamber, JL ;
Ekholm, S ;
Krabill, W .
GEOPHYSICAL RESEARCH LETTERS, 1998, 25 (16) :3177-3180
[2]   Comparison of Greenland ice sheet topography measured by TOPSAR and airborne laser altimetry [J].
Bindschadler, R ;
Fahnestock, M ;
Sigmund, A .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1999, 37 (05) :2530-2535
[3]   A low-cost glacier-mapping system [J].
Christensen, EL ;
Reeh, N ;
Forsberg, R ;
Jorgensen, JH ;
Skou, N ;
Woelders, K .
JOURNAL OF GLACIOLOGY, 2000, 46 (154) :531-537
[4]   EMISAR: An absolutely calibrated polarimetric L- and C-band SAR [J].
Christensen, EL ;
Skou, N ;
Dall, J ;
Woelders, KW ;
Jorgensen, JH ;
Granholm, J ;
Madsen, SN .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1998, 36 (06) :1852-1865
[5]  
Dall J, 2000, INT GEOSCI REMOTE SE, P1125, DOI 10.1109/IGARSS.2000.858043
[6]   Elevation change measurements of the Greenland Ice Sheet [J].
Forsberg, R ;
Keller, K ;
Nielsen, CS ;
Gundestrup, N ;
Tscherning, CC ;
Madsen, SN ;
Dall, J .
EARTH PLANETS AND SPACE, 2000, 52 (11) :1049-1053
[7]   APPLICATION OF A COMBINED ROUGH-SURFACE AND VOLUME SCATTERING-THEORY TO SEA ICE AND SNOW BACKSCATTER [J].
FUNG, AK ;
EOM, HJ .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 1982, 20 (04) :528-536
[8]   Penetration depths inferred from interferometric volume decorrelation observed over the Greenland ice sheet [J].
Hoen, EW ;
Zebker, HA .
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2000, 38 (06) :2571-2583
[9]  
Jezek K. C., 1992, IEEE GEOSCI REMOTE S, P6
[10]  
Madsen SN, 1996, AEU-ARCH ELEKTRON UB, V50, P106