DINSAR experiments using a free processing chain

Nowadays, several free or commercial tools for INSAR, DINSAR and even PS INSAR exist. A brief inventory of current suites is drawn and shows their main capabilities. The objective of this work is the handling and the validation of our use of DORIS, a free processing suite. For this purpose, the organization of the processing is studied and compared to another one (SARSCAPE, a commercial software). It appears that both chains contain identical or similar steps but, some stages are missing or are replaced by a different one. Experiments are then held with DORIS and SARSCAPE using the same data set: two ASAR images covering the 2003 Bam (Iran) earthquake and a SRTM3 DEM. Using DORIS and SARSCAPE, it leads to comparable results, which allows validating our use of DORIS (and also SARSCAPE). However, linear and non linear residual differences occur. In the same way, dissimilarities are observed with other published results. These dispecrancies are interpreted as resulting from residual geometric inaccuracies. One solution to reduce these artefacts is a simple surface compensation but the orbital parameters are then not corrected. Finally, this work may give some help for a better understanding of any DINSAR processing chain.

[1]  Howard A. Zebker,et al.  Decorrelation in interferometric radar echoes , 1992, IEEE Trans. Geosci. Remote. Sens..

[2]  D. Sandwell,et al.  Phase gradient approach to stacking interferograms , 1998 .

[3]  Francesca Romana Cinti,et al.  InSAR surface displacement field and fault modelling for the 2003 Bam earthquake (southeastern Iran) , 2005 .

[4]  Janusz Wasowski,et al.  Investigating landslides with space-borne Synthetic Aperture Radar (SAR) interferometry , 2006 .

[5]  O. Monserrat,et al.  STATE-OF-THE-ART OF LAND DEFORMATION MONITORING USING DIFFERENTIAL SAR INTERFEROMETRY , 2005 .

[6]  Fabio Rocca,et al.  Nonlinear subsidence rate estimation using permanent scatterers in differential SAR interferometry , 2000, IEEE Trans. Geosci. Remote. Sens..

[7]  Gianfranco Fornaro,et al.  A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms , 2002, IEEE Trans. Geosci. Remote. Sens..

[8]  M. Engdahl,et al.  Persistent scatterer interferometry independent validation and intercomparison of results : final report , 2007 .

[9]  Ramon F. Hanssen,et al.  The Interpretation of Bam Fault Kinematics Using Envisat SAR Interferometric Data , 2006 .

[10]  Daniel Raucoules,et al.  Use of SAR interferometry for detecting and assessing ground subsidence , 2007 .

[11]  B. Kampes.  Radar Interferometry: Persistent Scatterer Technique , 2006 .

[12]  James Jackson,et al.  Surface displacements and source parameters of the 2003 Bam (Iran) earthquake from Envisat advanced synthetic aperture radar imagery , 2005 .

[13]  Howard A. Zebker,et al.  Phase unwrapping for large SAR interferograms: statistical segmentation and generalized network models , 2002, IEEE Trans. Geosci. Remote. Sens..

[14]  P. Rosen,et al.  Atmospheric effects in interferometric synthetic aperture radar surface deformation and topographic maps , 1997 .

[15]  T. Wright,et al.  The 2003 Bam (Iran) earthquake: Rupture of a blind strike‐slip fault , 2004 .

[16]  D. Sandwell,et al.  Three-dimensional deformation caused by the Bam, Iran, earthquake and the origin of shallow slip deficit , 2005, Nature.

[17]  Mahdi Motagh,et al.  Combination of Precise Leveling and InSAR Data to Constrain Source Parameters of the Mw = 6.5, 26 December 2003 Bam Earthquake , 2006 .

[18]  S. Usai,et al.  Doris: The Delft Object-Oriented Radar Interferometric Software , 1999 .

[19]  P. Rosen,et al.  Updated repeat orbit interferometry package released , 2004 .

[20]  Esra Erten,et al.  I.D.I.O.T.: A FREE AND EASY-TO-USE SOFTWARE TOOL FOR DINSAR ANALYSIS , 2007 .

[21]  R. Goldstein,et al.  Mapping small elevation changes over large areas: Differential radar interferometry , 1989 .

[22]  Stefania Usai,et al.  A least squares database approach for SAR interferometric data , 2003, IEEE Trans. Geosci. Remote. Sens..

[23]  Andrew Hooper,et al.  Phase unwrapping in three dimensions with application to InSAR time series. , 2007, Journal of the Optical Society of America. A, Optics, image science, and vision.

[24]  A. Reigber,et al.  RAT ( Radar Tools ) : A free SAR image analysis software package , 2004 .

[25]  Rudiger Gens.  SAR interferometry : Software, data format, and data quality , 1999 .

[26]  P. Visser,et al.  Precise orbit determination and gravity field improvement for the ERS satellites , 1998 .