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
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)
Earth Observation & Remote Sensing
Remote Sensing
Active sensor Passive sensor
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)
SAR interferometry
SAR interferometry
• The interferometric phase contains:
➫ The orbital phase
➫ The topographic phase
➫ The atmospheric phase delay
➫ The displacements phase
➫ Noise
SAR differential interferometry - DInSAR
© "Robert A. Eplett/CAL EMA"
California Governor's Office of
Emergency Services
Landers earthquake - 1992
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
MSBAS
• Multidimensional Small BAseline Subset approach:
➫Differential phase time series
➫Multi sensor / multiple acquisition geometries approach
• Allows retrieving East-West and
vertical displacement components
Funu landslide monitoring
• Test site: Funu, Bukavu, RDC
Funu landslide monitoring
CSK
S1
CSK + S1
(M)SBAS displacement rates
measurements: Limburg Mining area • Example of CSK line of sight
displacement rate monitoring:
(M)SBAS displacement rates
measurements: Limburg Mining area • Example of CSK line of sight displacement rate monitoring:
➫ zoom on Lummen highway cross:
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
Dynamic coherence monitoring: Wildfires
Dynamic coherence monitoring: Floods
Dynamic coherence monitoring: Floods
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.
Thank you For your attention
DE ULTIEME CONNECTIE
LA CONNEXION À L'ÉTAT
PUR
21
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