Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16874
Title: Spatial-temporal surface deformation of Los Angeles over 2003-2007 from weighted least squares dinsar
Authors: Hu, J
Li, Z
Ding, X 
Zhu, J
Sun, Q
Keywords: Deformation
Differential SAR interferometry
Sbas
Weighted least squares
Issue Date: 2012
Publisher: Elsevier
Source: International journal of applied earth observation and geoinformation, 2012, v. 21, no. 1, p. 484-492 How to cite?
Journal: International journal of applied earth observation and geoinformation 
Abstract: The spatial-temporal evolution of surface displacement of Los Angeles area over 2003-2007 is measuredwith weighted least squares (WLS) small baseline (SB) DInSAR technique. 32 small baseline interferograms are generated from 18 SAR images acquired by the ENVISAT satellite and separated into two independent subsets. An additional interferogram with a longer baseline but good interferometric quality is used to link the two subsets. A time series of displacements with their corresponding standard deviations (STD) are derived from the WLS DInSAR solution by considering the interferometric displacement variances when determining the weighting scheme. Both the long-term trends and the seasonal variations of the displacements in the area are determined in the study and validated with GPS measurements from a number of stations of the Southern California Integrated GPS Network (SCIGN). The mean line-of-sight (LOS) displacement velocity map shows up to 3 cm/year of ground motion and up to 10 cm of accumulated displacements in Santa Fe Springs and -8 cm in Pomona over 2003-2007. Seasonal variations are identified in Santa Ana basin, the San Gabriel valley and the Lytle Creek basin, respectively.
URI: http://hdl.handle.net/10397/16874
ISSN: 1569-8432
EISSN: 1872-826X
DOI: 10.1016/j.jag.2012.07.007
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