agri_tdx_igarss2011_hajnsek_comp_final.pdf
36
IGARSS’11, Vancouver TanDEM-X: Pol-InSAR over Agricultural Areas *Irena Hajnsek, Kostas Papathanassiou, Florian Kugler Microwaves and Radar Institute, DLR Oberpfaffenhofen, Germany * Institute of Environmental Engineering, ETH Zurich, Switzerland
-
Upload
grssieee -
Category
Technology
-
view
420 -
download
0
Transcript of agri_tdx_igarss2011_hajnsek_comp_final.pdf
IGARSS’11, Vancouver
TanDEM-X: Pol-InSAR over Agricultural Areas
*Irena Hajnsek, Kostas Papathanassiou, Florian Kugler
Microwaves and Radar Institute, DLR Oberpfaffenhofen, Germany
* Institute of Environmental Engineering, ETH Zurich, Switzerland
Slide 2
Agricultural Parameter Estimation: Current Research Status
Scat
Mechanisms
Developed
Methods Physical Products Observables
Research
Status
Bare surface
(surface
scattering,
dihedral scat.)
X-Bragg Soil Moisture Content
Soil Roughness
Soil Penetration Depth
PolSAR
@ longer l
medium
mature
Vegetated
surface
(surface,
dihedral,
volume scat.)
Decomposition
Theorems
Topography
Soil Moisture Content
Soil Roughness
PolSAR
Pol-InSAR
D-InSAR
@ longer l
low
mature
Vegetation
volume
(volume,
dihedral scat.)
RVoGM
OVoGM
PCT
Vegetation Height
Vegetation Extinction
Vegetation Structure
Vegetation Biomass
PolSAR
InSAR
Pol-InSAR
@ shorter l
low
mature
Slide 3
Agricultural Parameter Estimation: Current Research Status
Scat
Mechanisms
Developed
Methods Physical Products Observables
Research
Status
Bare surface
(surface
scattering,
dihedral scat.)
X-Bragg Soil Moisture Content
Soil Roughness
Soil Penetration Depth
PolSAR
@ longer l
medium
mature
Vegetated
surface
(surface,
dihedral,
volume scat.)
Decomposition
Theorems
Topography
Soil Moisture Content
Soil Roughness
PolSAR
Pol-InSAR
D-InSAR
@ longer l
low
mature
Vegetation
volume
(volume,
dihedral scat.)
RVoGM
OVoGM
PCT
Vegetation Height
Vegetation Extinction
Vegetation Structure
Vegetation Biomass
PolSAR
InSAR
Pol-InSAR
@ shorter l
low
mature
Slide 4
Agricultural Parameter Estimation: Current Research Status
Scat
Mechanisms
Developed
Methods Physical Products Observables
Research
Status
Bare surface
(surface
scattering,
dihedral scat.)
X-Bragg Soil Moisture Content
Soil Roughness
Soil Penetration Depth
PolSAR
@ longer l
medium
mature
Vegetated
surface
(surface,
dihedral,
volume scat.)
Decomposition
Theorems
Topography
Soil Moisture Content
Soil Roughness
PolSAR
Pol-InSAR
D-InSAR
@ longer l
low
mature
Vegetation
volume
(volume,
dihedral scat.)
RVoGM
OVoGM
PCT
Vegetation Height
Vegetation Extinction
Vegetation Structure
Vegetation Biomass
PolSAR
InSAR
Pol-InSAR
@ shorter l
low
mature
Slide 5
Agricultural Parameter Estimation: Current Research Status
Scat
Mechanisms
Developed
Methods Physical Products Observables
Research
Status
Bare surface
(surface
scattering,
dihedral scat.)
X-Bragg Soil Moisture Content
Soil Roughness
Soil Penetration Depth
PolSAR
@ longer l
medium
mature
Vegetated
surface
(surface,
dihedral,
volume scat.)
Decomposition
Theorems
Topography
Soil Moisture Content
Soil Roughness
PolSAR
Pol-InSAR
D-InSAR
@ longer l
low
mature
Vegetation
volume
(volume,
dihedral scat.)
RVoGM
OVoGM
PCT
Vegetation Height
Vegetation Extinction
Vegetation Structure
Vegetation Biomass
PolSAR
InSAR
Pol-InSAR
@ shorter l
low
mature
Slide 6
Kz Range for Agricultural Applications
Adapted to TanDEM-X system configuration
Incidence angle fixed for 30 degree
For a crop height of 1-2.5m a kz between
2-3 provides the best sensitivity
Slide 7
Kz Range Translated into Baseline (TanDEM-X Configuration)
For a kz of 2-3 baselines from 2-3km would be ideal corresponding to a
height of ambiguity of ~ 2-3m.
Slide 8
1 km
rape winter wheat
maize
Agricultural Test Site Wallerfing (North of Munich)
Acqu. Dates Comments / Ground Campaign HOA/baseline/kz
12.04 acquired, no on-site measurements 38m/133m/0.047
23.04 acquired, no on-site measurements --
04.05 acquired, on-site measurements 33m/153m/0.041
15.05 acquired, on-site measurements 32m/160m/0.039
26.05 acquired, on-site measurements 30m/167m/0.038
06.06 corrupted --
17.06 acquired, no on-site measurements --
28.06 acquired, on-site measurements --
09.07 planed --
20.07 planed --
31.07 planed --
11.08 planed --
22.08 planed --
Slide 9
Site Overview – Phenology 04. May 2011 (blue marks: soil moisture; yellow marks: vegetation & partly soil moisture)
height = 0 cm height = 26 cm height = 131 cm
maize winter wheat rape seed
Slide 10
Site overview – Phenology 15./26. May 2011
height = 5 cm
height = 25 cm height = 51 cm
height = 126 cm height = 36 cm
height = 133
cm
maize winter wheat rape seed
Slide 11
Temperature and Precipitation
0
5
10
15
20
25
01/04/
11
08/04/
11
15/04/
11
22/04/
11
29/04/
11
06/05/
11
13/05/
11
20/05/
11
27/05/
11
date
tem
pe
ratu
re [°C
]
0
5
10
15
20
25
30
pre
cip
ita
tio
n [m
m]
RAINSUM
TA200AVG
TS005AVG
Meteo Data: Daily Precipitation 01.04.-31.05.2011
Data take
© StMELF Agrarmeteo
Slide 12
TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes
Test Site: Wallerfing, Germany
Date: 12/04
Year: 2011
Pol: HH & VV
Stripmap Mode
Slide 13
TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes
Test Site: Wallerfing, Germany
Date: 04/05
Year: 2011
Pol: HH & VV
Stripmap Mode
Slide 14
TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes
Test Site: Wallerfing, Germany
Date: 15/05
Year: 2011
Pol: HH & VV
Stripmap Mode
Slide 15
TanDEM-X: Dual-Pol InSAR: First Bistatic Data Takes
Test Site: Wallerfing, Germany
Date: 26/05
Year: 2011
Pol: HH & VV
Stripmap Mode
Slide 16
12.04.2011
26.05.2011 15.05.2011
04.05.2011
2-Dim Polarimetric
Scattering Entropy
Slide 17
12.04.2011
26.05.2011 15.05.2011
04.05.2011
2-Dim Polarimetric
Scattering Angle
α=0°
α=90°
α=45°
Slide 18
SNR correction
Interferometric coherence VV-Pol
Test Site: Wallerfing, Germany
04/05/2011
Slide 19
SNR correction Coherence VV 4th May 2011
VV
VV
HH
HH
Terra SAR-X
TanDEM-X
NESZ Polynomials (from xml files)
Test Site: Wallerfing, Germany
04/05/2011
Slide 20
Pol-InSAR SNR Correction
Interferometric coherence VV-Pol
before SNR correction
Interferometric coherence VV-Pol
after SNR correction
Test Site: Wallerfing, Germany 04.05.2011
Slide 21
Pol-InSAR SNR Correction
Interferometric coherence HH-Pol
before SNR correction
Interferometric coherence HH-Pol
after SNR correction
Test Site: Wallerfing, Germany 04.05.2011
Slide 22
VV Coherence
12.04.2011
26.05.2011 15.05.2011
04.05.2011
Slide 23
HH Coherence
12.04.2011
26.05.2011 15.05.2011
04.05.2011
Slide 24
Max Coherence
12.04.2011
26.05.2011 15.05.2011
04.05.2011
Slide 25
Min Coherence
12.04.2011
26.05.2011 15.05.2011
04.05.2011
Slide 26
Pol-InSAR SNR Masking
Interferometric coherence Max Interferometric coherence Min
Test Site: Wallerfing, Germany 04.05.2011
Slide 27
Pol-InSAR SNR Masking
Interferometric coherence Max Interferometric coherence Min
Test Site: Wallerfing, Germany 04.05.2011
Slide 28
Pol-InSAR SNR Masking
12.04.2011 26.05.2011 15.05.2011 04.05.2011
Slide 29
InSAR Coherence VV-pol: Zoom for Field Selection
04/05
12/04
15/05
26/05
Slide 30
Statistics of the InSAR Coherence (3 Fields)
Interferometric coherence measured as a mean over the entire field
Red: rape,
Green: corn,
Blue: wheat
Red: rape,
Green: corn,
Blue: wheat
Slide 31
Dual Pol-InSAR: Maximum Phase Difference Estimation
Interferometric Coherence: at polarisation
i22ii11i
iiii
w]T[ww]T[w
w]Ω[w)w,w(γ~
)w,w(γ~ ii
iw
Cb,awbwaw)w,w(γ~ VVHHiii
)w,w(γ~ maxmax
)w,w(γ~ minmin
Coherence Region:
Max. Phase diff. between polarisations
Slide 32
Dual Pol-InSAR: Max Height Difference
12.04.2011
26.05.2011
15.05.2011
04.05.2011
Slide 33
Statistics of the Max Phase Difference & Height Difference
Red: rape
Green: corn
Blue: wheat
Red: rape
Green: corn
Blue: wheat
Main problem:
Too low kz
Very short vegetation
Solution:
Special 3-4 months TanDEM-X phase for growing crops
(hopefully in the third year)
Slide 34
First Pol-InSAR
Data Takes
Dual-Pol HH-VV Spotlight
Test Site Location: Russia
InSAR Mode: Monostatic
Temporal Baseline: 3sec
Spatial Baseline (┴): 275m
Slide 35
Pol-InSAR
HH-HH VV-VV
HH VV
Interferometric
Coherence
Amplitude Images
Slide 36
Pol-InSAR
0 1 2 [m] 3
Max height difference
Kz: 0.24
HOA: 26
Baseline: 252m
AOI: 39°
