“analysis of the time evolution of temporal coherence
TRANSCRIPT
“Analysis of the Time Evolution of Temporal Coherence using COSMO
SkyMed HH and VV data” Balbarani, S.; Euillades P. A.; Euillades L. D.; Riveros N. C.
CEDIAC Institute - National University of Cuyo Mendoza - Argentina
Background
DInSAR MT-InSAR SBAS PS
Interferometric Coherence
MLE Estimator
A Priori Model
Ferretti et al. (2001)
Berardino et al. (2002)
Seymour et al. (1994) Touzi et al. (1999) Zebker et al. (1992)
2nd Generation X-band SAR Systems COSMO SkyMed (ASI)
TerraSAR-X (DLR)
X-Band Decorrelation in DTS Context ¿HH or VV?
Area of Interest
COSMO SkyMed Data Interferometric Mode StripMap HIMAGE
Tx/Rx: HH and VV
Time Span ~ June, 2010 to March, 2012
Datasets: 32 HH & 30 VV
Raw data (Level 0) – HDF5
ASI - ID2154 Proyect: “Monitoring crustal deformation in Mendoza region with X-band dual polarization data and SBAS ”
Methodology CSK Raw Data - 32 HH 30 VV
SAR Images Co-registered
Focused & Parameters
Extraction
Interferometric Products Generation
Local Slope on Range Direction
Wang et al. (2010)
All Interferometric Pairs Determination
& DEM Extraction
Temporal Coherence
Maps
Coherence Maps & Interferograms
Co-registration
Range Matrix
ROIs Definition & Empirical
Study
Geometric Coherence Maps
Temporal Term Extraction
CSK Parameters
Incidence Angle
DEM in SAR Geometry
496 HH-HH 435 VV-VV
Range and Azimuth Spectral Shift Estimation
Gatelli et al. (1994)
Regions Of Interes - ROIs Mountainous
Agricultural
Bare Soil
Urban
Results ¿Coherent Pixel?
Criteria: Threeshold: 0.25 Percentage: 30%
Pixel status in terms of Temporal Coherence
91%
84%
93%
98%
Soil Coverage
Urban & Bare Soil
Mountainous & Agrucultural Soil
Vs.
Polarization
HH
Results
Statistical Analysis Temporal Baseline
32 days 48 days 64 days
…..
16 days
S1 A1 U3
Temporal Coherence - CSK HH (8 days) Master 10/21/2010 - Slave 10/29/2010
N~40
Results
HH-Pol
VV-Pol
Box and Wisker Plots
Results
HH-Pol
VV-Pol
Results
HH-Pol
VV-Pol
Results
HH-Pol
VV-Pol
Conclusions
1
2
Quantity of Coherent Pixels in the ROIs:
X-Band Temporal Decorrelation
• HH and VV similar behavior
• Urban and bare soils versus agricultural and mountanious soils
• Slightly higher number of pixels in HH polarization
• Different Histogram Distribution in urban coverage
• Seasonal behavior in presence of vegetation
• Temporal coherence loss in distributed scatterers (4 or 5 months)
• Possible higher values of VV temporal coherence in urban area
COSMO SkyMed Temporal Decorrelation (X-Band)
References • Berardino, P., Fornaro, G., Lanari, R., Sansosti, E., 2002. A new algorithm for surface deformation monitoring based
on small baseline differential SAR interferograms. IEEE Trans. Geosci. Remote Sens. 40, 2375–2383.
• COSMO SkyMed System, 2010. Description and Userguide: http://www.e-geos.it/products/pdf/csk-user_guide.pdf
• Ferretti, A., Prati, C., Rocca, F., 2001. Permanent scatterers in SAR interferometry. Geosci. Rem. Sens. IEEE. On 39, 8–20.
• Gabriel, A.K., Goldstein, R.M., Zebker, H.A., 1989. Mapping small elevation changes over large areas: differential radar interferometry. J. Geophys. Res. Solid Earth 1978–2012 94, 9183–9191.
• Gatelli, F., Monti Guarnieri, A., Parizzi, F., Pasquali, P., Prati, C. and Rocca, F., 1999. The wavenumber shift in SAR Interferometry, IEEE Transactions on Geoscience and Remote Sensing, 32(4):855–865.
• Massonnet, D. y K. Feigl, 1998. "Radar Interferometry and its Application to Changes in the Earth's Surface." Reviews of Geophysics. Vol 36, Nº 4, pp. 441-500
• Pepe, A., Lanari, R., 2006. On the extension of the minimum cost flow algorithm for phase unwrapping of multitemporal differential SAR interferograms. Geosci. Remote Sens. IEEE Trans. On 44, 2374–2383.
• Seymour, M. S. and Cumming, I. G., 1994. Maximum Likelyhood Estimation For SAR Interferometry, in: International Geoscience and Remote Sensing Symposium, Pasadena, CA, USA, 8–12 August 1994, pp. 2272–2275.
• Wang, T., Liao, M., Perissin, D., 2010. InSAR Coherence-Decomposition Analysis. IEEE Geosci. Rem. Sens. Let. 7, 156–160.
• Zebker, H.A., Villasenor, J., 1992. Decorrelation in interferometric radar echoes. Geosci. Remote Sens. IEEE Trans. On 30, 950–959.
Appendix