interferometric processing with...

March 4, 2008 1

Interferometric processingwith Doris

Ramon Hanssen

Delft University of Technology

The Netherlands

March 4, 2008 2

Day 2• Boot to Linux system:

• Insert Live-USB stick• Restart computer, press F9 while booting• Choose Ubuntu boot (persistent)

• Test Linux commands (see QRS, page 19/20)• Read QRS p. 3,4• Install Doris software (p. 5-8), follow steps

March 4, 2008 3

Doris software characteristics• UNIX based;

• ascii files.• command line.

• One executable program;• keep track of all performed processing steps.

• Result files (e.g., 9192.res);• keep track of processing parameters for master image,

slave image, interferogram (products)• Modular processing

• each steps can be replaced by alternative methods.• methods can be tuned using input file.• general cards (MEMORY, SCREEN, PREVIEW, etc.).• specific cards (NUM_WINS, DAT_FILENAME, etc.).

March 4, 2008 4

Processing Steps (simplified)• Initial steps;

• for master and slave image• read image parameters (acq. date, timing, etc.)• crop the data (cdrom harddisk)• get precise orbits (software by TU Delft)

• Coregistration;• Interferogram generation;• Phase unwrapping;

• very complicated step/may result in errors.• software from Curtis Chen (Stanford University).

• Geo-referencing • (Interpretation…);

March 4, 2008 5

CROP

March 4, 2008 6

Processing flowchartPreparing the data before interferogram

Read Parameters

Crop

Precise orbits

Basic procedure

Coregistration:

-Orbits

-Cross-correlation:

--Coarse

--Fine

-Coregistration Polynomial

Resampling slaveSpectral Filter range. (If large Bperp)

CoherencePhase Filter

Interferogram

Compute and substractref. phase

Phase unwrapping

DEM/DinSAR

Spectral Filter azimuth. (If high Doppler)

March 4, 2008 7

Processing flowchartGeneral processing overview

March 4, 2008 8

Doris: input file & results file

DorisInput filesInput.m_initial

Input.s_initial

…

result files:*.res

Text files with result parameters

(*.log, Processing info)

(Original image)

Processed image

For generating input files type:

run –g

March 4, 2008 9

Doris: input file & results fileInput file (input.*):• General options.• IO files.• PROCESS ..• Input cards.

Results file (*.res):• Processing flags.• Result parameters.

March 4, 2008 10

Doris PROCESS steps Defo-pair:• m/s_readfiles

• m/s_crop

• m/s_porbits

• coarseorb

• coarsecorr

• m/s_filtazi

• fine

• coregpm

• resample

• filtrange

• interfero

• comprefpha

• subtrrefpha

• dinsar

READ & CROP

PRECISE ORBITS

COREGISTRATION

RESAMPLING SLAVE

INTERFEROGRAM

SUBTRACTION REFERENCE SURFACE

SUBTRACTION TOPOGRAPHY

March 4, 2008 11

Doris PROCESS steps Topo-pair:• m/s_readfiles

• m/s_crop

• m/s_porbits

• coarseorb

• coarsecorr

• m/s_filtazi

• fine

• coregpm

• resample

• filtrange

• interfero

• comprefpha

• subtrrefpha

• coherence

• unwrap

• slant2h

READ & CROP

PRECISE ORBITS

COREGISTRATION

RESAMPLING SLAVE

INTERFEROGRAM


UNWRAPPING

GEOGRAPHICAL COORDINATES

March 4, 2008 12

Doris PROCESS steps Topo-pair:• m/s_readfiles

• m/s_crop

• m/s_porbits

• coarseorb

• coarsecorr

• m/s_filtazi

• fine

• coregpm

• resample

• filtrange

• interfero

• comprefpha

• subtrrefpha

• coherence

• unwrap

• slant2h

Defo-pair:• m/s_readfiles

• m/s_crop

• m/s_porbits

• coarseorb

• coarsecorr

• m/s_filtazi

• fine

• coregpm

• resample

• filtrange

• interfero

• comprefpha

• subtrrefpha

• dinsar

READ & CROP

PRECISE ORBITS

COREGISTRATION

RESAMPLING SLAVE

INTERFEROGRAM


SUBTRACTION TOPOGRAPHY

READ & CROP

PRECISE ORBITS

COREGISTRATION

RESAMPLING SLAVE

INTERFEROGRAM


UNWRAPPING

GEOGRAPHICAL COORDINATES

March 4, 2008 13

Input file: general cards & io files## the general cards# SCREEN info // level of output to standard outBEEP warning // level of beepingPREVIEW on // SUNraster files with cpxfiddleMEMORY 150 // MBOVERWRITE ON // overwrite existing filesBATCH ON // non-interactiveLISTINPUT ON // copy this file to logHEIGHT 0.0 // average terrain height above WGS84TIEPOINT 0.0 0.0 0.0 // lat/lon/hei of a tiepointORB_INTERP POLYFIT 3 // 3rd degree polynomial (not good for RSAT)## the general io files# --------------------LOGFILE doris.log // log fileM_RESFILE master.res // parameter file masterS_RESFILE slave.res // parameter file slaveI_RESFILE master_slave.res // parameter file interferogram

March 4, 2008 14

Input file: m_readfiles & m_cropPROCESS & INPUT CARDS:

PROCESS m_readfilesPROCESS m_crop

c //comment ___READFILES___ //c //

M_IN_VOL /d2/gron/05351/VDF_DAT.001 // slc volume fileM_IN_LEA /d2/gron/05351/LEA_01.001 // slc leaderfileM_IN_DAT /d2/gron/05351/DAT_01.001 // slc data fileM_IN_NULL dummy //c //comment ___CROP___ //c //

M_CROP_ID master // identifierM_CROP_IN /d2/gron/05351/DAT_01.001 // slc data fileM_CROP_OUT /d2/gron/05351/05351.raw // output filenameM_DBOW_GEO 51.98868294 4.39054025 800 160 //c M_DBOW LINESTART LINESTOP PIXELSTART PIXELSTOP // database output window

March 4, 2008 15

Input file: read parameters, crop, precise orbits# ------------------------------------------# The general options# ------------------------------------------SCREEN info // level of output to standard out……

# ------------------------------------------# The general io files# ------------------------------------------

LOGFILE doris.log // log fileM_RESFILE 9192.res // parameter file masterS_RESFILE 9693.res // parameter file slaveI_RESFILE 9192_9693.res // parameter file interferogram

PROCESS m_readfiles // reading of slc filesPROCESS m_crop // convert data to internal formatc PROCESS m_ovs // optionally oversample dataPROCESS m_porbits // get precise orbits

…

..STOP // mandatory

Comments, skipped by doris

Files would be created in your current directory.

Otherwise, Outinfo/file.res

Last line

March 4, 2008 16

Input file: read parameters, crop, precise orbits

# ------------------------------------------# READFILES (master)# ------------------------------------------

c M_IN_METHOD JERS // uses ERS ceos reader…c --or select following 2 for ENVISAT--M_IN_METHOD ASAR // ENVISATM_IN_DAT /home/miguel/Desktop/Doris/DINSARII/9192.N1 // please link the actual input file with ln –s

# ------------------------------------------# CROP (master)# ------------------------------------------M_CROP_ID master // identifierM_CROP_IN /home/miguel/Desktop/Doris/DINSARII/9192.N1 // please link the actual input file with ln -sM_CROP_OUT /home/miguel/Desktop/Doris/DINSARII/Outdata/9192.raw // output filenameM_DBOW_GEO 29.10 58.35 15000 3000 // lat_0[deg], lon_0, height, width[pix]

# ------------------------------------------# PORBITS (master)# ------------------------------------------…M_ORBDIR /d2/orbits/envisat/eigen-grace01s // grace gravity model

m_readfiles, m_crop & m_porbits:

March 4, 2008 17

Res filesStart_process_controlreadfiles: 1precise_orbits: 1crop: 1oversample: 0filt_azi: 0filt_range: 0NOT_USED: 0End_process_control

********************************************************************_Start_readfiles:*******************************************************************Volume file:

"ASA_IMS_1PNUPA20031203_061259_000000162022_00120_09192_0099.N1" 49…SWATH: "IS2"PASS: "DESCENDING"SPH_DESCRIPTOR: "Image Mode SLC Image"RADAR_FREQUENCY (HZ): 5331004416.000000

March 4, 2008 18

Read Parameters, Crop & Precise orbits

Long, lat

o

N. of pixels

N. of lines

**************************************************************_Start_readfiles:*************************************************************Volume file: "ASA_IMS_1PNUPA20031203_061259_000000162022_00120_09192_0099.N1" 49…

*******************************************************************_Start_precise_orbits:******************************************************************

t(s) X(m) Y(m) Z(m)NUMBER_OF_DATAPOINTS: 722374.000000 2967183.861 5500024.280 3495567.381…

*******************************************************************_Start_crop: master******************************************************************Data_output_file:

/home/miguel/Desktop/Doris/DINSARII/Outdata/9192.raw

Res file

March 4, 2008 19

Results file: process control flags

MASTER RESULTFILE: master.res

Start_process_controlreadfiles: 1precise_orbits: 0 crop: 1oversample: 0filt_azi: 0filt_range: 0NOT_USED: 0End_process_control

March 4, 2008 20

Results file: m_readfiles & m_crop*_Start_readfiles:*******************************************************************Volume file: /d2/gron/05351/VDF_DAT.001Volume_ID: UP520625 Volume_identifier: 0005321600006710Volume_set_identifier: 1996042821352622(Check)Number of records in ref. file: 26355Product type specifier: PRODUCT:ERS-2.SAR.SLC Logical volume generating facility: UK-PAF Logical volume creation date: 20040907Location and date/time of product creation: GENERATED AT UK-PAF 7-SEP-2004 11:26:08.140 Scene identification: ORBIT 5351 DATE 28-APR-1996 21:35:26 Scene location: FRAME 1063 LAT: 53.22 LON: 6.71Leader file: /d2/gron/05351/LEA_01.001Sensor platform mission identifer: SAR- C-HR-IM-VV Scene_centre_latitude: 53.2160000Scene_centre_longitude: 6.7100000Radar_wavelength (m): 0.0565646First_pixel_azimuth_time (UTC): 28-APR-1996 21:35:26.259Pulse_Repetition_Frequency (computed, Hz): 1679.92605342Total_azimuth_band_width (Hz): 1378.0000000Weighting_azimuth: HAMMING Xtrack_f_DC_constant (Hz, early edge): -649.0900000Xtrack_f_DC_linear (Hz/s, early edge): 125700.0000000Xtrack_f_DC_quadratic (Hz/s/s, early edge): 99000000.0000000

March 4, 2008 21

Range_time_to_first_pixel (2way) (ms): 5.5643960Range_sampling_rate (computed, MHz): 18.9624273765Total_range_band_width (MHz): 15.55Weighting_range: HAMMING

*******************************************************************Datafile: /d2/gron/05351/DAT_01.001Number_of_lines_original: 26354Number_of_pixels_original: 4900******************************************************************** End_readfiles:_NORMAL*******************************************************************

********************************************************************_Start_crop: master*******************************************************************Data_output_file: /d2/gron/05351/05351.rawData_output_format: complex_shortFirst_line (w.r.t. original_image): 1Last_line (w.r.t. original_image): 26354First_pixel (w.r.t. original_image): 1Last_pixel (w.r.t. original_image): 4900******************************************************************** End_crop:_NORMAL*******************************************************************

Results file: m_readfiles & m_crop (2)

March 4, 2008 22

m_porbits & s_porbits

Precise orbits:• t, X, Y, Z .• WGS84.• uses ‘getorb’

program and ODR files.

IN (input file):comment ___PORBITS___ //

c //M_ORBDIR /d1/delftorbits/ERS2M_ORB_EXTRATIME 5 // Time before first lineM_ORB_INTERVAL 4 // Time between datac //

OUT (result file):*********************************************************_Start_precise_orbits:********************************************************

t(s) X(m) Y(m) Z(m)NUMBER_OF_DATAPOINTS: 2977720.000000 4446406.801 217338.873 5603886.16377721.000000 4440834.493 214955.683 5608383.99577722.000000 4435257.045 212573.075 5612875.730

March 4, 2008 23

Amplitude

Reference phase

Topographic phase

RADAR INTERFEROMETRIC OBSERVATIONS

March 4, 2008 24

Original orbits

March 4, 2008 25

Precise orbits

March 4, 2008 26

Processing Steps (Detailed)• Initial steps;

• for master and slave image• read image parameters (acq. date, timing, etc.)• crop the data (cdrom harddisk)• get precise orbits (software by Remko Scharroo, then Delft

university)• Coregistration;• Interferogram generation;• Phase unwrapping;

• very complicated step.• software from Curtis Chen (Stanford University).

• Geo-referencing;• (Interpretation…);

March 4, 2008 27

Coregistration Steps (details)Goal: align slave image on top of master;• Coarse offset based on geometry (precise orbits);• Coarse offset based on amplitude cross-correlation

of large image patches;• Fine offset: compute local offset vectors based on

amplitude cross-correlation of a large number of small patches distributed over the whole image;

• Modeling estimated offsets by 2D polynomial of degree 2 (see, e.g., Doris manual)

• Actual resampling (interpolation) of slave image on top of master image

March 4, 2008 28

BAM quake descending pass• descending pass• D-InSAR

March 4, 2008 29

Processing Steps (Detailed)• Initial steps;

• for master and slave image• read image parameters (acq. date, timing, etc.)• crop the data (cdrom harddisk)• get precise orbits (software by Remko Scharroo, then Delft

university)• Coregistration;• Interferogram generation;• Phase unwrapping;

• very complicated step.• software from Curtis Chen (Stanford University).

• Geo-referencing of result;• (Interpretation…);

March 4, 2008 30

Interferogram Generation (details)• Pointwise complex conjugated multiplication of

master with co-registered slave image;• i.e., phase difference master – slave;

• Reference phase modeling;• Reference phase subtraction;• Coherence map;

2D polynomial degree 5

March 4, 2008 31

Differential Interferogram (details)

remove topography• using other interferogram.• (or existing DEM).

Here: 3-pass differential technique;• Interferogram without deformation• Interferogram spanning event (same master, i.e., same grid)• Use topographic information from topo-pair to remove

topography from interferogram spanning the event (phase scales with the perpendicular baseline)

• Requires unwrapped phase of topo-pair.

March 4, 2008 32

Coregistration• Coarseorb: based on orbits.• Coarsecorr: amplitude cross-correlation (large

windows).• Fine: amplitude cross-correlation (small windows,

oversampling).

March 4, 2008 33

Coregistration – input filecomment ___COARSE COREGISTRATION___ //c //CC_METHOD magfft // defaultc CC_IN_POS ///d2/Delft/winposcoarse.ascCC_NWIN 31 // number of windowsCC_WINSIZE 512 128 // size of windowsCC_INITOFF orbit // use result of orbitsc //c ___ ___ //comment ___FINE COREGISTRATION___ //c //FC_METHOD magfft //FC_IN_POS /d2/mudvolcanoes/winpos.ascFC_NWIN 1001 // number of windowsFC_WINSIZE 64 64 // size of windowsFC_ACC 8 8 // search window, 2^nFC_INITOFF coarsecorr // use result of coarseFC_OSFACTOR 16 // oversampling factorc //c ___ ___comment ___COREGISTRATION PARAMETERS___c //CPM_THRESHOLD 0.5 //CPM_DEGREE 1 //CPM_PLOT NOBG // plot w/o magnitude background

March 4, 2008 34

Coregistration – input file# ------------------------------------------# COARSE COREGISTRATION# ------------------------------------------

CC_METHOD magfft // default

CC_NWIN 11 // number of large windowsCC_WINSIZE 512 128 // size of windows (square better?)CC_INITOFF orbit // use result of orbits

# ------------------------------------------# FINE COREGISTRATION# ------------------------------------------

FC_METHOD magfft // fast

FC_NWIN 1000 // number of smaller windowsFC_WINSIZE 128 128 // size of windowsFC_ACC 16 16 // search window, 2^n

FC_INITOFF COARSECORR // use result of coarseFC_OSFACTOR 32 // oversampling factorFC_PLOT 0.3 BG // GMT plot with magnitude BackGround image

March 4, 2008 35

Coregistration – result file********************************************************************_Start_coarse_orbits:*******************************************************************Some info for pixel: 14000, 2808 (not used):Bperp [m]: 143.5Bpar [m]: 47.3Bh [m]: 150.9Bv [m]: 7.2B [m]: 151.1alpha [deg]: 2.7 // baseline orientationtheta [deg]: 21 // look angleinc_angle [deg]: 23.8 // incidence angleorbitconv [deg]: 0.00423806 // convergenceHeight_amb [m]: 60.4Btemp: [days]: -1120

Estimated translation slave w.r.t. master (slave-master):Coarse_orbits_translation_lines: -175Coarse_orbits_translation_pixels: -6******************************************************************** End_coarse_orbits:_NORMAL*******************************************************************

March 4, 2008 36

Coregistration – result file********************************************************************_Start_coarse_correl:*******************************************************************Estimated translation slave w.r.t. master:Coarse_correlation_translation_lines: -128Coarse_correlation_translation_pixels: -6******************************************************************** End_coarse_correl:_NORMAL*******************************************************************

********************************************************************_Start_fine_coreg:*******************************************************************Oversampling factor: 16Number_of_correlation_windows: 475Number posL posP offsetL offsetP correlation

0 7074 1925 -126.44 -5.38 0.361 8440 846 -129.81 -5.25 0.272 11083 1410 -129.19 -5.44 0.463 11927 1228 -129.31 -5.25 0.264 7086 1836 -128.19 -5.50 0.44

March 4, 2008 37

Coregistration

Fine coregistration:• Offset vectors slave-

master.• Length and direction

varies with position and elevation.

March 4, 2008 38

Coregistration• Estimation of coregistration polynomial, process coregpm• Resampling, process resample• Both processes are in file input.resample

# ------------------------------------------# COREGISTRATION PARAMETERS MODELING# ------------------------------------------

CPM_THRESHOLD 0.4 // higher threshold->less windowsCPM_DEGREE 2 // 2d-polynomialCPM_WEIGHT linear //linear method

CPM_MAXITER 20 // automated removal, max 20 iterationsCPM_PLOT NOBG // plot w/o magnitude background

March 4, 2008 39

Coregpm• Estimation of coregistration polynomial.• Output in CPM_data file.

Window number, position L, position P, offsetL (observation), offsetP (observation), correlation,estimated errorL, errorP, w-test statistics for L, P.

win posL posP offL offP corr eL eP wtstL wtstP------------------------------------------------------------

0 27 29 252.06 -2.25 0.54 0.08 -0.04 0.57 0.431 27 534 251.94 -2.25 0.81 -0.01 0.02 0.04 0.202 27 1039 252.00 -2.38 0.60 0.09 -0.05 0.59 0.523 27 1544 251.94 -2.38 0.66 0.06 0.01 0.43 0.084 27 2049 251.81 -2.44 0.52 -0.03 0.01 0.20 0.055 27 2554 251.69 -2.50 0.77 -0.11 0.00 0.75 0.016 27 3059 251.75 -2.50 0.51 -0.01 0.06 0.07 0.577 27 3564 251.62 -2.62 0.45 -0.10 -0.01 0.66 0.11

10 538 233 251.88 -2.31 0.83 -0.08 -0.08 0.57 0.81

March 4, 2008 40

Coregistration, coregpmOutput in CPM_data file.

Window number, position L, position P, offsetL (observation), offsetP (observation), correlation,estimated errorL, errorP, w-test statistics for L, P.

win posL posP offL offP corr eL eP wtstL wtstP------------------------------------------------------------

0 27 29 252.06 -2.25 0.54 0.08 -0.04 0.57 0.43

March 4, 2008 41

Coregpmwin posL posP offL offP corr eL eP wtstL wtstP------------------------------------------------------------

0 27 29 252.06 -2.25 0.54 0.08 -0.04 0.57 0.43

residuals

w-teststatistics

March 4, 2008 42

Resampling slave to master grid IN (input file):

c //comment ___RESAMPLING SLAVE___ //

c //RS_METHOD cc6p //RS_OUT_FILE /d2/mudvolcanoes/int_21632_21131/slave.resampledRS_OUT_FORMAT cr4 //RS_DBOW 7000 12000 500 2000 // database output windowc //

March 4, 2008 43

Resampling slave to master grid

The pixels of the slave are shifted to the corresponding position given by the polynomial

IN (input file):

# ------------------------------------------# RESAMPLING SLAVE# ------------------------------------------RS_METHOD rc6p // best choice (theory 0.9999)c --- Output file ---RS_OUT_FILE /home/miguel/Desktop/Doris/DINSARII/Outdata/9693_resampled.rawRS_OUT_FORMAT CR4 //CR4 (complex_real4bytes, real in the sense of real numbers) or Ci2 (complex integes

//2bytes)RS_SHIFTAZI on // keep this on, unless doppler shift very small

March 4, 2008 44

InterferoIN (input file):

comment ___INTERFEROGRAM___ //c //INT_OUT_CINT /d2/mudvolcanoes/int_21632_21131/master_slave.cint // INT_MULTILOOK 5 1 // line, pixel factorsc //

)(2121

*21

2121 ϕϕϕϕ −− == jjj eyyeyeyyy

March 4, 2008 45

Interfero: topo-pair

Phase contributions: reference surface+topography+deformation+atmosphere+noise

March 4, 2008 46

Interferogram•Compute interferogram, process interfero

•Compute reference phase, process comprefpha

•Subtract reference phase, process subtrrefpha

•All in input.products

# ------------------------------------------# INTERFEROGRAM# ------------------------------------------

INT_METHOD old // INT_OUT_CINT /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.cint // optional complex int.INT_MULTILOOK 5 1 // line, pixel factors

# ------------------------------------------# REFERENCE PHASE COMPUTATION# ------------------------------------------

FE_METHOD porbits //FE_DEGREE 5 //FE_NPOINTS 501 //

# ------------------------------------------# SUBTRACT REFERENCE PHASE# ------------------------------------------

SRP_OUT_CINT /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.srp //SRP_MULTILOOK 3 3

March 4, 2008 47

Interfero


)(2121

*21

2121 ϕϕϕϕ −− == jjj eyyeyeyyy

March 4, 2008 48

Reference phase subtractionIN (input file):

c //comment ___REFERENCE PHASE___ //c //

FE_METHOD porbits //FE_DEGREE 5 //FE_NPOINTS 501 //c //c //comment ___SUBTRACT REFERENCE PHASE___//c //

SRP_METHOD polynomial // evaluate comprefpha polySRP_OUT_CINT /d2/mudvolcanoes/int_21632_21131/int_21632_21131.srp //SRP_MULTILOOK 2 2 //

March 4, 2008 49

Subtrrefpha

- ref_phase

Phase contributions: topography+deformation+atmosphere+noise

Topo-pair

Bperp=380m ; H_amb=23m; Btemp=35days

Rule of thumb

Bperp=100m -> H_amb=100m



March 4, 2008 50

Subtrrefpha

- ref_phase

Phase contributions: topography +deformation+atmosphere+noise

Topo-pair

Bperp=380m ; H_amb=23m; Btemp=35days

March 4, 2008 51

Phase variance estimation:Coherence

•Optics equivalent to correlation:

•Estimation of coherence:

}|{|}|{|}{

22

21

*21

yEyEyyE⋅

=γ

∑ ∑∑

= =

==N

n

N

nnn

N

nnn

yy

yy

1 12)(

22)(

1

1)(

2)(

1

||||

|||ˆ| γ

March 4, 2008 52

Coherence

March 4, 2008 53

Coherence•Process coherence in input.products

----------------------------------------# COHO# ------------------------------------------COH_METHOD old // COH_OUT_COH /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.coh // optional realCOH_MULTILOOK 5 1 // same as interferogramCOH_WINSIZE 15 15 // estimator window size

∑∑

∑

==

==N

iii

N

iii

N

iii

c

SSN

MMN

SMN

0

*

0

*

0

*

11

1

γ

Coherence estimator

March 4, 2008 54

CoherenceIN (input file):

c //comment ___COHERENCE___// c //

COH_OUT_COH /d2/mudvolcanoes/int_21632_21131/coh.rawCOH_MULTILOOK 10 2 COH_WINSIZE 10 2c

March 4, 2008 55

Coherence•Process coherence in input.products

----------------------------------------# COHO# ------------------------------------------COH_METHOD old // COH_OUT_COH /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.coh // optional realCOH_MULTILOOK 5 1 // same as interferogramCOH_WINSIZE 15 15 // estimator window size

∑∑

∑

==

==N

iii

N

iii

N

iii

c

SSN

MMN

SMN

0

*

0

*

0

*

11

1

γ

Coherence estimator

March 4, 2008 56

Phase Unwrapping•Process unwrap in input.filter_unwrap# ------------------------------------------# PHASE UNWRAPPING# ------------------------------------------

UW_OUT_FILE /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.uint // unwrapped interferogramUW_METHOD SNAPHUUW_OUT_FORMAT HGTUW_SNAPHU_LOG snaphu.logUW_SNAPHU_coh /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.cohUW_SNAPHU_MODE TOPOUW_SNAPHU_INIT MSTUW_SNAPHU_VERBOSE ON

March 4, 2008 57

Phase Unwrapping

March 4, 2008 58

Unwrap & Slant2HIN (input file):comment ___UNWRAP PHASE___ //c //

UW_OUT_FILE /d2/mudvolcanoes/int_21632_21131/int_21632_21131.uint // unwrapped interferogram

UW_METHOD SNAPHUUW_SNAPHU_LOG snaphu.logUW_SNAPHU_MODE TOPOUW_SNAPHU_INIT MSTUW_SNAPHU_VERBOSE ONccomment ___SLANT2H___c

S2H_METHOD ambiguityS2H_OUT_HEI /d2/mudvolcanoes/int_21632_21131/heitopo.rawS2H_OUT_PHI /d2/mudvolcanoes/int_21632_21131/phitopo.rawS2H_OUT_LAM /d2/mudvolcanoes/int_21632_21131/lamtopo.raw

March 4, 2008 59

Slant to height conversion and geocoding

Process slant2h in input.s2h_geocode

Process geocode in input.s2h_geocode

March 4, 2008 60

Slant2h & conversion to UTM

March 4, 2008 61

InterferoTopo-pair Defo-pair


March 4, 2008 62

SubtrrefphaTopo-pairBperp=380m ; H_amb=23m ; Btemp=35days

Defo-pairBperp=144m ; H_amb=60m ; Btemp=1120days

- ref_phase - ref_phase

March 4, 2008 63

March 4, 2008 64

Differential InSAR

• Process dinsar, in file input.filter_unwrap

# ------------------------------------------# DIFFERENTIAL INSAR# ------------------------------------------

DI_OUT_FILE /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.dcint // differentialDI_IN_TOPOSLAVE /home/miguel/Desktop/Doris/DEM/Inputfiles/6687.res //topo slaveDI_IN_TOPOINT /home/miguel/Desktop/Doris/DEM/Inputfiles/9192_6687.res //topopair

March 4, 2008 65

DInSARIN (input file):

c //comment ___DINSAR___//c //

DI_OUT_FILE diffint.raw //DI_IN_TOPOSLAVE /d2/mudvolcanoes/int_21632_21131/slave.res //DI_IN_TOPOINT /d2/mudvolcanoes/int_21632_21131/master_slave.res //

March 4, 2008 66

DInSAR

- ref_phase - (ref_phase+topography)

Phase contributions: deformation+atmosphere+noise

March 4, 2008 67

DInSAR- ref_phase (Bperp=500m) - (ref_phase+topography)


March 4, 2008 68

Doris Cook Book

• Login: defolabs• Pass:InSAR_lr• Create DEM directory• Links to original data• Execute:

run –g –M MasterOrbit –S slaveOrbit

(have a look to the directories you’ve created, in particular Inputfiles)

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Interpretation: On the sign of the phase

-image on the right is standard output Doris (independent of descending or ascending image)

LANDSATNORTH

EAST

WEST

SOUTH

NORTH

SOUTH

EAS

T !!

!

WES

T !!!

-π +π

Early azimuth

Far rangeNear range

Late azimuth

T.Wright, Oxford

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Phase-deformation relationship

Subsidence ∆z

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FIRST, consider the TIMES of the images!!!

We perform: MASTER – SLAVE

CHECK: tmaster < tslave

If YES: range increase (Rt1 < Rt2)phase decrease (φt1> φt2)

interferometric phase increase (φt1−φt2 > 0)

φπλ

4−=D

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NORTH

SOUTH

EAS

T !!

!

WES

T !!!-π +π

Early azimuth

Far rangeNear range

Late azimuth

Towards center: BYR: increasing interferometric phase increasing range to

satellite

φπλ

4−=D

Towards center: BRY: decreasing interferometric phase decreasing range to

satellite

Colorbar BYR: increasing interferometric phase

+-

March 4, 2008 73


NORTH

SOUTH

EAS

T !!

!

WES

T !!!-π +π

Early azimuth

Far rangeNear range

Late azimuth

March 4, 2008 74


NORTH

SOUTH

EAS

T !!

!

WES

T !!!-π +π

Early azimuth

Far rangeNear range

Late azimuth

NORTH

SOUTH

EAS

T !!!

WES

T !!

!

-π +π

Far range Near range

az

CONCLUSION: Right lateral (strike slip)

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CHECK:

March 4, 2008

76

SRTM shaded-relief topography

Nayband fault

Gowk fault

Gareth Funning1, Barry Parsons1, Tim Wright1, Eric Fielding2,3, James Jackson2 and Morteza Talebian4

Jebal Barez

mountains

Dasht-e Lut

March 4, 2008

77

Azimuth offsetsAscending Descending

Gareth Funning1, Barry Parsons1, Tim Wright1, Eric Fielding2,3, James Jackson2 and MortezaTalebian4

March 4, 2008 78

Phase ambiguities

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Phase unwrapping steps

1. Determine phase gradients2. Detect problem areas3. Phase gradient integration

March 4, 2008 80

Phase unwrapping errors

March 4, 2008 81

Spectral FilteringThe reflected signal is a vectorial summation of the

objects belonging to a resolution cell.

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Remind in: Spectral Filtering• Spectral shift is caused by a difference in the local incident angle.• If baseline ≥ baselinecrit there is no spectral overlap !• Spectral filtering increases SNR , thus improving unwrapping.

Spectral filtering = removing non-overlapping parts

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Spectral Filtering in Doris• In azimuth direction, process m/s_filtazi, in file input.coregistration, (after coarse before

fine corresgistration)• In range direction, process filtrange , in file input.resample, after resampling

# ------------------------------------------# AZIMUTH FILTERING# ------------------------------------------…AF_OUT_MASTER Outdata/9192.afAF_OUT_SLAVE Outdata/9693.af…

# ------------------------------------------# RANGE FILTERING (master&slave)# ------------------------------------------…RF_METHOD adaptive // estimate local fringe freq, adapts depending on local SNRRF_OUT_MASTER Outdata/9192.rf_adaptRF_OUT_SLAVE Outdata/6687.rf_adapt

March 4, 2008 84

March 4, 2008 85

3-Pass differential Interferometry• DInSAR consist in removing the topography of

defopair using the topopair:• Topo and Defo-pair have a common master.• Assume non deformation in topo-pair • Btopo

perp≥ Bdefoperp and Btopo

perp < 0.7 Bcritperp

• Method: The topopair is unwrapped and then wrapped to defopair fringe frequency.

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3-Pass differential Interferometry

Topo-pairBperp=380m ; H_amb=23m ; Btemp=35days

Defo-pairBperp=144m ; H_amb=60m ; Btemp=1120days

- ref_phase - ref_phase

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DInSAR

- ref_phase - (ref_phase+topography)


March 4, 2008 88

DInSAR- ref_phase - (ref_phase+topography)


March 4, 2008 89

Differential InSAR

• Process dinsar, in file input.filter_unwrap

# ------------------------------------------# DIFFERENTIAL INSAR# ------------------------------------------

DI_OUT_FILE /home/miguel/Desktop/Doris/DINSARII/Outdata/9192_9693.dcint // differentialDI_IN_TOPOSLAVE /home/miguel/Desktop/Doris/DEM/Inputfiles/6687.res //topo slaveDI_IN_TOPOINT /home/miguel/Desktop/Doris/DEM/Inputfiles/9192_6687.res //topopair

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New processing methodologies

• To resolve the ambiguities• Separate topography and deformation• To detect information in the noise• To estimate/mitigate atmospheric signal• To estimate orbit errors

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The Goldstein Filter

March 4, 2008 92

Precise orbits

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Filtered

interferometric processing with...

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