Coherent vs. Persistent Scatterers: A Case...
Transcript of Coherent vs. Persistent Scatterers: A Case...
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Coherent vs. Persistent Scatterers: A Case Study.
L. Marotti, N. Adam, A. Parizzi, K.P. PapathanassiouGerman Aerospace Center (DLR)
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CSs Concept
CSs can be defined as scatterers with point-like scattering behavior;
They are unaffected by multiple scattering effects;
As point-like scatterers the CSs are characterized by a correlated object spectrum.
Detection performed by exploiting spectral correlation properties addressed in terms of image sub-look (spectral) correlation;
Detection quality related to the available system bandwidth;
No temporal stability is assumed in their definition;
Main applications: characterization of individual scatterers trough their polarimetric properties, estimation of LOS rotation angle and dielectric constant.
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Airborne CSs detection: Single-Pol (HH), Quad-Pol, Multi-Frequency (L-,C-,X-Band)
100 MHz system bandwidth Red: HH , Green: HV, Blue: VV Munich
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ALOS Data Set
2007 02 151.1PLRALPSRP056502630
2006 12 311.1PLRALPSRP049792630
2006 11 151.1PLRALPSRP043082630
2006 09 301.1PLRALPSRP026372630
2006 08 151.1PLRALPSRP029662630
2006 06 301.1PLRALPSRP022952630
Acquisition Date
P. LevelP. TypeScene ID
Sensor: ALOS-PalSARRepeat Interval: 46 Days Time period: 7.5 months.System Bandwidth: 14MHz
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HHRGB-code:
Red: HH , Green: HV, Blue: VV
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Dataset
Test site: MunichSensor: ERSSystem bandwidth: 16MHz
Start time: 27-APR-1992End time: 22-AUG-2002# Acquisitions: 86Time period:10 years
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CSs detection in time
The mean sub-lookCoherence is used for the detection
One imageSub-look coherences
Stack
Sub-look1
Sub-look2
x *
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CSs detection
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Correlation Sub-look coherence – Amplitude
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Correlation Sub-look coherence – SCR
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PSs Concept
Natural stable scatterers over long time series of SAR data;
They are characterized by a coherent behavior in the time;
Possible exploitation of large datasets independently from baseline or temporal separation;
Detection quality related to high number of acquisitions;
Enabled the development of many interferometric application: velocity terrain displacements evaluation , accurate DEM generation ecc.
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PSs and CSs detection
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PSs and CSs detection
PSC ~ 112KCS ~ PSCCommon points ~ 20K
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PSs vs. CSs: Amplitude
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PSs vs. CSs: Amplitude
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PSs vs. CSs: SCR
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PSs vs. CSs: Sub-look coherence
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PS velocity displacement map
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CSs velocity displacement map
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Deformation estimation comparison
-0.98-0.37CSsPSs
Mean Velocity (mm/yr)
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Conclusions
The CSs detection performed with narrow system bandwidth, also if maybe non optimal, has been demonstrated;
Stable CSs were found to be present in SAR images acquired over a long time period;
The CSs amplitude signal and its correlation with the CSs sub-look coherence has been evaluated while no correlation has been foundbetween CSs sub-look coherence and SCR;
The relation between CSs and PSs have been analyzed in term of their location in the scene, backscattered signal amplitude, SCR as well as amount of sub-look coherence;
The possibility to perform LOS velocity displacement evaluation by means of CSs have been also investigated.