Topographic phase recovery from stacked ERS interferometry and a low-resolution digital elevation model

被引:37
作者
Sandwell, DT [1 ]
Sichoix, L [1 ]
机构
[1] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA
关键词
D O I
10.1029/2000JB900340
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A hybrid approach to topographic recovery from ERS interferometry is developed and assessed. Tropospheric/ionospheric artifacts, imprecise orbital information, and layover are key issues in recovering topography and surface deformation from repeat-pass interferometry. Previously, we developed a phase gradient approach to stacking interferograms to reduce these errors and also to reduce the short-wavelength phase noise (see Sandwell and Pi-ice [1998] and Appendix A). Here the method is extended to use a low-resolution digital elevation model to constrain long-wavelength phase errors and an iteration scheme to minimize errors in the computation of phase gradient. We demonstrate the topographic phase recovery on 16-m postings using 25 ERS synthetic aperture radar images from an area of southern California containing 2700 m of relief. On the basis of a comparison with 81 GPS monuments, the ERS-derived topography has a typical absolute accuracy of better than 10 m except in areas of layover. The resulting topographic phase enables accurate two-pass, real-time interferometry even in mountainous areas where traditional phase unwrapping schemes fail. As an example, we form a topography-free (127-m perpendicular baseline) interferogram spanning 7.5 years; fringes from two major earthquakes and aseismic slip on the San Andreas Fault are clearly isolated.
引用
收藏
页码:28211 / 28222
页数:12
相关论文
共 39 条
[1]  
[Anonymous], 1998, TP1998206861 NASA GO
[2]  
Bendat JS., 2011, RANDOM DATA ANAL MEA
[3]  
BURKE K, 1988, TOPOGRAPHIC SCI WORK
[4]  
Curlander J. C., 1991, SYNTHETIC APERTURE R
[5]  
DIXON TH, 1995, 95003 TR U MIAM ROS
[6]  
EVANS DL, 1995, TM4679 NASA
[7]  
FARR TG, 2000, EOS T AGU S, V81, pS163
[8]   Crustal deformation measurements using repeat-pass JERS 1 synthetic aperture radar interferometry near the Izu Peninsula, Japan [J].
Fujiwara, S ;
Rosen, PA ;
Tobita, M ;
Murakami, M .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1998, 103 (B2) :2411-2426
[9]   MAPPING SMALL ELEVATION CHANGES OVER LARGE AREAS - DIFFERENTIAL RADAR INTERFEROMETRY [J].
GABRIEL, AK ;
GOLDSTEIN, RM ;
ZEBKER, HA .
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS, 1989, 94 (B7) :9183-9191
[10]   ROBUST 2-DIMENSIONAL WEIGHTED AND UNWEIGHTED PHASE UNWRAPPING THAT USES FAST TRANSFORMS AND ITERATIVE METHODS [J].
GHIGLIA, DC ;
ROMERO, LA .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 1994, 11 (01) :107-117