tutorial euref2018 insar data processing · 1 Data download Unavco.org EUREF 2018 4 1 Data download...
Transcript of tutorial euref2018 insar data processing · 1 Data download Unavco.org EUREF 2018 4 1 Data download...
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1EUREF 2018
InSAR data processing
EUREF 2018 tutorial
Freek van Leijen
Delft University of Technology
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InSAR data processing flow
1Data download
2Interferometric
processing
3Time series analysis
4Post‐
processing
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3EUREF 2018
1 Data download
Unavco.org
4EUREF 2018
1 Data downloadData volumes (single polarization)
Mission Size Pixel spacing Repeat cycle Data size per product
Data size per year
TerraSAR‐X(Stripmapmode)
50x30 km ~3x3 m 11 days 1.9 GB 63 GB
Cosmo‐Skymed(Stripmapmode)
40x40 km ~3x3 m 4 days (mean)
1.7 GB 155 GB
RadarSAT‐2(Stripmap(XF) mode)
125x125 km ~3x3 m 24 days 5.4 GB 81 GB
Sentinel‐1(TOPS (IW) mode)
170x250 km ~14x5 m 6 days 4.1 GB 246 GB
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2 Interferometric processing
Image reading
Image co‐registration
Image resampling
Interferogram formation
Reference phase
subtraction (Ellipsoid, DEM)
(Phase unwrapping/
ambiguity resolution)
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Based on:• Image matching techniques, or• Geometric relations (precise satellite orbits, DEM, image
timing parameters)
Required precision:• 0.1 pixel (Stripmap mode)• 0.001 pixel (TOPS mode (Sentinel-1))
2 Interferometric processing
Image reading
Image co‐registration
Image resampling
Interferogram formation
Reference phase
subtraction (Ellipsoid, DEM)
(Phase unwrapping/
ambiguity resolution)
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7EUREF 2018
2 Interferometric processing
Image reading
Image co‐registration
Image resampling
Interferogram formation
Reference phase
subtraction (Ellipsoid, DEM)
(Phase unwrapping/
ambiguity resolution)
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2 Interferometric processingSoftware
Open source software, e.g.
• DORIS (TU Delft, NL)
• SNAP toolbox (ESA)
• GMTSAR (Scripps Institution of Oceanography, USA)
Commercial software, e.g.
• GAMMA (GAMMA Remote Sensing, CH)
• SARScape (SARmap, CH)
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3 Time series analysis
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
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3 Time series analysis
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
?Detection
Estimation
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3 Time series analysis
• Based on radar intensity consistency
• Typically 3-5 pts/km2
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
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3 Time series analysis
• Typically 3-5 pts/km2
• Ambiguity resolution and parameter estimation based on spatial and/or temporal smoothness, e.g., linear deformation rates
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
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3 Time series analysis
• Estimation of differential tropospheric and ionospheric signal delay
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
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3 Time series analysis
In urban areas, typically • 1000 pts/km2 for medium-
resolution data• 10000 pts/km2 for high-
resolution data
Corresponding to max ~10% of original number of pixels.
Initial point selectionFirst‐order network
estimationAtmospheric phase screen estimation
Densification
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3 Time series analysisSoftware
Open source software, e.g.
• StaMPS (Leeds, UK)
Commercial software, e.g.
• GAMMA (GAMMA Remote Sensing, CH)
• SARScape (SARmap, CH)
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4 Post-processing
E.g.,
• Georeferencing
• Point classification
• Separation deformation regimes
• Creation derived products (e.g., data gridding)
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