14. PSInSAR. Past Case Studies
• Deformation near the Wieliczka Salt
Mine in Poland
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15. Salt Mine in Poland
• Subject and Motivations of the Study
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16. Salt Mine in Poland
• Available Data
• 51 images ERS-1/2
(ESA)
• 1992 to 2000
•Repeat cycle 34 days
• Single orbit direction
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17. Salt Mine in Poland
• Experimental Results
– PS density
• Maximum=480 PS/km2 (center of Wieliczka)
• Minimum=30 PS/km2 (sparse urbanization areas)
• Average=92 PS/km2
– Comparison with subsidence maps Agreement
• Leveling data 1970-2000
• PSInSAR data 1992-2000
– Field investigation
• Interpretation of Observations
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18. Salt Mine in Poland
• Experimental Results
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19. Salt Mine in Poland
• Conclusions
– Slow subsidence detected by PSInSAR
– Proof of utility of SAR archive
– Agreement leveling data
– More PS density --> Urban areas
– PS on landslide area
• Variability
• Horizontal displacement limitation of PSInSAR
– Field inspection
• Confirmation of PSInSAR observations
• Hope for risk assessment
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20. PSInSAR. Recent Case Studies
• PSInSAR Analysis of damages during construction of
parking near Koepoortbrug (Delft)
• Filter optimization for PSInSAR analysis
– Houtribdijk
• Monitoring Spoorzone Delft with PSInSAR
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22. Koepoortbrug
• Available Data
• Envisat (ESA)
• 2003 to 2006
•Every 35 days
• Single orbit
direction
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23. Koepoortbrug
• Experimental Results
• Background:
Amplitude SAR
• Overlaid: PS area of
interest
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24. • Conclusions Koepoortbrug
– Historic data → normal behavior
– Envisat data not suitable. Reasons:
– Very sudden deformations
– Undersampling (35 day repetition rate)
– Possible change of orientation
• Temporal decorrelation
– Repair works
• Solution
– Another data set
• Higher repetition rate
• Shorter wavelength (improve detectability)
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25. PSInSAR. Recent Case Studies
• PSInSAR analysis of damages during construction of
parking near Koepoortbrug (Delft)
• Filter optimization for PSInSAR analysis
– Houtribdijk
• Monitoring Spoorzone Delft with PSInSAR
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29. Houtribdijk
• Conclusions
– Denoise filtering smooths time series
– Optimization: Triangular filter. Length 10-12 months
– Similar Performance: Gaussian filter > 12 months
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30. PSInSAR. Recent Case Studies
• PSInSAR analysis of damages during construction of
parking near Koepoortbrug (Delft)
• Filter optimization for PSInSAR analysis
– Houtribdijk
• Monitoring Spoorzone Delft
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40. Spoorzone Delft
• Experimental Results
– Thermal Expansion
Power of the technique:
• Detect thermal
expansion in high
buildings
Correlation:
• PSInSAR thermal
theory
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42. Spoorzone Delft
• Experimental Results
– Detectable Deformation
Side tilt Subsidence Front tilt
1 mm 1.09 mm 7.7 mm
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43. Conclusions
• Power
– Historic archive (past/future)
– Large coverage
– Cost
– Processing improvements
• Interpretation of observations not straightforward
• PS → physical entities?
PSInSAR can provide mm accuracy in detection of
deformation
Monitoring Structures → Damage prevention
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