“Analysis of the Time Evolution of Temporal Coherence ...
Transcript of “Analysis of the Time Evolution of Temporal Coherence ...
“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?
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)
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
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)
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