begeo - agoria - 404 · 2018-04-25 · nowadays profusion of sar data, including copernicus ones,...
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BEGEO
DE ULTIEME CONNECTIE / LA CONNEXION À
L'ÉTAT PUR
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SAR interferometry: Time series and multi-
sensor approach for vertical and horizontal
displacements monitoring
Dominique Derauw1,2, François Kervyn3, Nicolas d’Oreye2
1 Centre Spatial de Liège
2 Royal Museum of Central Africa
3 European Centre for Geodynamics and Seismology (Luxembourg)
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Earth Observation & Remote Sensing
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Remote Sensing
Active sensor Passive sensor
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SAR Remote Sensing
• Global coverage at repeated
cycle
• Insensitivity to external
illumination
• High sensitivity - large dynamic
• Very large area coverage
• Day and night (➫ X2)
• Insensitivity (or nearly...) to cloud
coverage ➫ All weather (➫ X5)
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SAR interferometry
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SAR interferometry
• The interferometric phase contains:
➫ The orbital phase
➫ The topographic phase
➫ The atmospheric phase delay
➫ The displacements phase
➫ Noise
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SAR differential interferometry - DInSAR
© "Robert A. Eplett/CAL EMA"
California Governor's Office of
Emergency Services
Landers earthquake - 1992
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Time series
• DInSAR gives a « one-shot » view of observable displacements
➫Post-seismic measurements
• To observe long-term displacements, one can use time-series and
combine DInSAR measurement sequences:
➫PSInSAR
➫MSBAS
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MSBAS
• Multidimensional Small BAseline Subset approach:
➫Differential phase time series
➫Multi sensor / multiple acquisition geometries approach
• Allows retrieving East-West and
vertical displacement components
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Funu landslide monitoring
• Test site: Funu, Bukavu, RDC
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Funu landslide monitoring
CSK
S1
CSK + S1
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(M)SBAS displacement rates
measurements: Limburg Mining area • Example of CSK line of sight
displacement rate monitoring:
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(M)SBAS displacement rates
measurements: Limburg Mining area • Example of CSK line of sight displacement rate monitoring:
➫ zoom on Lummen highway cross:
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Dynamic coherence monitoring
• Coherence is a quality indicator of InSAR phase measurement.
• It is also an indicator of scatterers characteristics and distribution
change between acqusition.
• It can thus be used as a dynamic indicator of scene changes:
➫Wildfires
➫Floods
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Dynamic coherence monitoring: Wildfires
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Dynamic coherence monitoring: Floods
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Dynamic coherence monitoring: Floods
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Conclusions
• Nowadays profusion of SAR data, including Copernicus ones,
allows performing continuous displacement monitoring of terrains
and manmade structures.
• CSL and ECGS developed an integrated tool, merging respective
expertises that is now used to perform continuous monitoring of
RMCA test sites in North Kivu, RDC.
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Thank you For your attention
DE ULTIEME CONNECTIE
LA CONNEXION À L'ÉTAT
PUR
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