Problem in mt_prep_snap
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Iling Yong
Mar 17, 2026, 2:13:34 PM (11 days ago) Mar 17
to MAINSAR
Dear All,
I am new to SNAP and StaMPS. I am trying to work out some output for the Mexico City. I did my snap2stamp-2.0.1. I successfully generated ifg and coreg and the StaMPS export. I have 8 SLC and formed 7 ifg pair. I confirm my AOI area is correct for all the ifg (I think so as when I open in SNAP, they show the same red rectangular box).
For the STAMPS export, I did have 4 folders as below.
iling@LAPTOP-N1FC2SLG:/mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930$ ls
dem diff0 geo rslc
dem diff0 geo rslc
However, when I run the mt_prep_snap, it show problem. all the mean amplitude is inf.
iling@LAPTOP-N1FC2SLG:/mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930$ mt_prep_snap 20180930 /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930 0.4 1 1 50 50
mt_prep_snap Andy Hooper, August 2017
Amplitude Dispersion Threshold: 0.4
Processing 1 patch(es) in range and 1 in azimuth
matlab: Command not found.
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6778651
Number of pixels with amplitude different than zero = 23867489
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180304.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6782419
Number of pixels with amplitude different than zero = 23863721
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180503.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6782430
Number of pixels with amplitude different than zero = 23863710
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180702.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6778235
Number of pixels with amplitude different than zero = 23867905
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180906.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6653799
Number of pixels with amplitude different than zero = 23992341
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180930.rslc...
WARNING : SLC /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180930.rslchas ZERO mean amplitude
Mean amplitude = 0
Number of pixels with zero amplitude = 30646140
Number of pixels with amplitude different than zero = 0
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20181105.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6654449
Number of pixels with amplitude different than zero = 23991691
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20190104.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6658124
Number of pixels with amplitude different than zero = 23988016
11140
2751
mt_extract_cands Andy Hooper, Jan 2007
Patch: PATCH_1
selpsc_patch /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/selpsc.in patch.in pscands.1.ij pscands.1.da mean_amp.flt f 1
file name for zero amplitude PS: pscands.1.ij0
dispersion threshold = 0.4
width = 11140
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
number of amplitude files = 8
number of lines per file = 2751
patch lines = 2751
patch width = 11140
Segmentation fault (core dumped)
psclonlat /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/psclonlat.in pscands.1.ij pscands.1.ll
opening pscands.1.ij...
width = 11140
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/20180930.lon...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/20180930.lat...
pscdem /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/pscdem.in pscands.1.ij pscands.1.hgt
opening pscands.1.ij...
pscdem: width = 11140
pscdem: opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/elevation_dem.rdc...
pscdem: input file specified as single precision
pscphase /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/pscphase.in pscands.1.ij pscands.1.ph
opening pscands.1.ij...
width = 11140
number of interferograms = 7
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180103.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180304.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180503.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180702.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180906.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20181105.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20190104.diff...
1 of 7 interferograms processed
2 of 7 interferograms processed
3 of 7 interferograms processed
4 of 7 interferograms processed
5 of 7 interferograms processed
6 of 7 interferograms processed
7 of 7 interferograms processed
mt_prep_snap Andy Hooper, August 2017
Amplitude Dispersion Threshold: 0.4
Processing 1 patch(es) in range and 1 in azimuth
matlab: Command not found.
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6778651
Number of pixels with amplitude different than zero = 23867489
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180304.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6782419
Number of pixels with amplitude different than zero = 23863721
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180503.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6782430
Number of pixels with amplitude different than zero = 23863710
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180702.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6778235
Number of pixels with amplitude different than zero = 23867905
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180906.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6653799
Number of pixels with amplitude different than zero = 23992341
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180930.rslc...
WARNING : SLC /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180930.rslchas ZERO mean amplitude
Mean amplitude = 0
Number of pixels with zero amplitude = 30646140
Number of pixels with amplitude different than zero = 0
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20181105.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6654449
Number of pixels with amplitude different than zero = 23991691
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20190104.rslc...
Mean amplitude = inf
Number of pixels with zero amplitude = 6658124
Number of pixels with amplitude different than zero = 23988016
11140
2751
mt_extract_cands Andy Hooper, Jan 2007
Patch: PATCH_1
selpsc_patch /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/selpsc.in patch.in pscands.1.ij pscands.1.da mean_amp.flt f 1
file name for zero amplitude PS: pscands.1.ij0
dispersion threshold = 0.4
width = 11140
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/rslc/20180103.rslc...
number of amplitude files = 8
number of lines per file = 2751
patch lines = 2751
patch width = 11140
Segmentation fault (core dumped)
psclonlat /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/psclonlat.in pscands.1.ij pscands.1.ll
opening pscands.1.ij...
width = 11140
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/20180930.lon...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/20180930.lat...
pscdem /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/pscdem.in pscands.1.ij pscands.1.hgt
opening pscands.1.ij...
pscdem: width = 11140
pscdem: opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/geo/elevation_dem.rdc...
pscdem: input file specified as single precision
pscphase /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/pscphase.in pscands.1.ij pscands.1.ph
opening pscands.1.ij...
width = 11140
number of interferograms = 7
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180103.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180304.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180503.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180702.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20180906.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20181105.diff...
opening /mnt/c/Users/iling/Documents/MexicoCity/snap9/snap2stamps-2.0.1/INSAR_20180930/diff0/20180930_20190104.diff...
1 of 7 interferograms processed
2 of 7 interferograms processed
3 of 7 interferograms processed
4 of 7 interferograms processed
5 of 7 interferograms processed
6 of 7 interferograms processed
7 of 7 interferograms processed
I appreciate your help. Thank you.
Regards,
Ai Ling
Nguyen Thi Minh Trang
Mar 18, 2026, 4:09:02 AM (10 days ago) Mar 18
to MAINSAR
Hi Ai Ling,
I've been where you are. I can tell you what worked for me.
1. Error: "matlab: Command not found."
I've been where you are. I can tell you what worked for me.
A couple things I noticed:
1. Error: "matlab: Command not found."
> Probably indicates that your Matlab has not been correctly installed. Make sure you have it installed and have a working Matlab license/trial.
2. Error: "Segmentation fault (core dumped)."
> This error has been discussed on SNAP STEP forum. The solution is to recompile StaMPS using GNU Compiler Collection (GCC) version 7 (gcc-7). The SNAP STEP forum thread is here: https://forum.step.esa.int/t/segmentation-fault-core-dumped-error-during-mt-prep-snap/15615/17
3. "Mean amplitude = inf" and "Mean amplitude = 0"
> I had same problem, and in my case, it was due to a combination of Endianness mismatch + GCC compilation.
Basically, in this worklow, there are multiple softwares and OSs. They store, read, export data in different orders. For example, a value of 00000789 could have been read inversely as 98700000, which can make a small value look like it is a big (or even infinite) value.
Seeing that your mean amplitude value is either 0 or infinite, it could be the case. For me, recompiling GCC resolved this problem.
Note: Some of the errors you had might stem from preprocessing steps preceding mt_prep_snap. Make sure you check all of those steps as well.
To know what results to expect after each step, you can compare your results with the IGARSS 2021 tutorial here: https://youtube.com/playlist?list=PLSXfkgjVHNAb_H7TSpPMmoEdihZ06bkRL&si=5l0Bhb6fUes3VvZz
GitHub page of that tutorial: https://github.com/DinhHoTongMinh/InSAR_IGARSS_tutorial/blob/main/IGARSS_2021/5_SNAP2StaMPS.pdf
Would be useful:
Official StaMPS manual: https://github.com/dbekaert/StaMPS/blob/master/Manual/StaMPS_Manual.pdf
Official snap2stamps GitHub page: https://github.com/mdelgadoblasco/snap2stamps
A snap2stamps tutorial: https://eo4society.esa.int/wp-content/uploads/2022/01/HAZA09_SNAP2StaMPS_MexicoCity_Tutorial.pdf
Good luck!
Trang
Iling Yong
Mar 19, 2026, 1:31:48 PM (9 days ago) Mar 19
to MAINSAR
Hi Trang,
STAMPS: ########################################
STAMPS: ####### StaMPS/MTI Version 4.0b6 #######
STAMPS: ####### Beta version, Jun 2018 #######
STAMPS: ########################################
STAMPS: Will process current directory only
STAMPS: ########################################
STAMPS: ################ Step 6 ################
STAMPS: ########################################
STAMPS: Directory is C:\Users\iling\Documents\MexicoCity\snap9\snap2stamps-2.0.1\INSAR_20180906
PS_UNWRAP: Starting
Phase-unwrapping...
GETPARM: small_baseline_flag='n'
GETPARM: unwrap_patch_phase='n'
GETPARM: scla_deramp='n'
Thank you for your suggestion. I am able to run this step now.
I change the SNAP 13 to SNAP 9, and use g++-7 and gcc-7 in ubuntu-20.04.
Thank you.
I am trying to follow the tutorial from IGARSS 2021 by Dr Dinh Ho Tong Minh. However, when I start the stamps(6,6) [unwrapping phase]. I realise that my code is different from Dr Dinh Ho Tong Minh. I get this line 'PS_UNWRAP: Windows detected: using old unwrapping code without statistical cost processing Triangulating...' and I suck at the unwrapping in space [I run almost 3-4hours but still running]. I get the 'uw_phase.mat' and 'uw_phase_time.mat', but not the unwrapping in space.
Did you have experience on this? Here is my ps_info and parameter used.
>> ps_info [I checked this, should be reasonable, just the 37.997degree a bit big but still <40degree] --> I am trying to change the std dev to 0.8 to check any help in unwrapping phase
1 03-Jan-2018 -44 m 24.307 deg
2 04-Mar-2018 5 m 18.879 deg
3 03-May-2018 -51 m 21.363 deg
4 02-Jul-2018 -85 m 15.313 deg
5 06-Sep-2018 0 m 37.997 deg
6 30-Sep-2018 -26 m 22.160 deg
7 05-Nov-2018 -40 m 22.645 deg
8 04-Jan-2019 -20 m 23.289 deg
Number of stable-phase pixels: 4008525
2 04-Mar-2018 5 m 18.879 deg
3 03-May-2018 -51 m 21.363 deg
4 02-Jul-2018 -85 m 15.313 deg
5 06-Sep-2018 0 m 37.997 deg
6 30-Sep-2018 -26 m 22.160 deg
7 05-Nov-2018 -40 m 22.645 deg
8 04-Jan-2019 -20 m 23.289 deg
Number of stable-phase pixels: 4008525
>> getparm
Created: '18-Mar-2026'
clap_alpha: 1
clap_beta: 0.3000
clap_low_pass_wavelength: 800
clap_win: 32
density_rand: 20
drop_ifg_index: []
filter_grid_size: 50
filter_weighting: 'P-square'
gamma_change_convergence: 0.0050
gamma_max_iterations: 3
gamma_stdev_reject: 0
heading: 190.4638
insar_processor: 'snap'
lambda: 0.0555
lonlat_offset: [0 0]
max_topo_err: 20
merge_resample_size: 0
merge_standard_dev: Inf
n_cores: 1
percent_rand: 20
platform: 'SENTINEL-1B'
plot_color_scheme: 'inflation'
plot_dem_posting: 90
plot_pixels_scatterer: 3
plot_scatterer_size: 120
quick_est_gamma_flag: 'y'
ref_centre_lonlat: [0 0]
ref_lat: [-Inf Inf]
ref_lon: [-Inf Inf]
ref_radius: Inf
ref_velocity: 0
scla_deramp: 'n'
scla_drop_index: []
scla_method: 'L2'
scn_deramp_ifg: []
scn_kriging_flag: 'n'
scn_time_win: 365
scn_wavelength: 100
select_method: 'DENSITY'
select_reest_gamma_flag: 'y'
shade_rel_angle: [90 45]
slc_osf: 1
small_baseline_flag: 'n'
subtr_tropo: 'n'
tropo_method: 'a_l'
unwrap_alpha: 8
unwrap_gold_alpha: 0.8000
unwrap_gold_n_win: 32
unwrap_grid_size: 200
unwrap_hold_good_values: 'n'
unwrap_la_error_flag: 'y'
unwrap_method: '3D'
unwrap_patch_phase: 'n'
unwrap_prefilter_flag: 'y'
unwrap_spatial_cost_func_flag: 'n'
unwrap_time_win: 730
weed_max_noise: Inf
weed_neighbours: 'n'
weed_standard_dev: 1
weed_time_win: 730
weed_zero_elevation: 'n'
clap_alpha: 1
clap_beta: 0.3000
clap_low_pass_wavelength: 800
clap_win: 32
density_rand: 20
drop_ifg_index: []
filter_grid_size: 50
filter_weighting: 'P-square'
gamma_change_convergence: 0.0050
gamma_max_iterations: 3
gamma_stdev_reject: 0
heading: 190.4638
insar_processor: 'snap'
lambda: 0.0555
lonlat_offset: [0 0]
max_topo_err: 20
merge_resample_size: 0
merge_standard_dev: Inf
n_cores: 1
percent_rand: 20
platform: 'SENTINEL-1B'
plot_color_scheme: 'inflation'
plot_dem_posting: 90
plot_pixels_scatterer: 3
plot_scatterer_size: 120
quick_est_gamma_flag: 'y'
ref_centre_lonlat: [0 0]
ref_lat: [-Inf Inf]
ref_lon: [-Inf Inf]
ref_radius: Inf
ref_velocity: 0
scla_deramp: 'n'
scla_drop_index: []
scla_method: 'L2'
scn_deramp_ifg: []
scn_kriging_flag: 'n'
scn_time_win: 365
scn_wavelength: 100
select_method: 'DENSITY'
select_reest_gamma_flag: 'y'
shade_rel_angle: [90 45]
slc_osf: 1
small_baseline_flag: 'n'
subtr_tropo: 'n'
tropo_method: 'a_l'
unwrap_alpha: 8
unwrap_gold_alpha: 0.8000
unwrap_gold_n_win: 32
unwrap_grid_size: 200
unwrap_hold_good_values: 'n'
unwrap_la_error_flag: 'y'
unwrap_method: '3D'
unwrap_patch_phase: 'n'
unwrap_prefilter_flag: 'y'
unwrap_spatial_cost_func_flag: 'n'
unwrap_time_win: 730
weed_max_noise: Inf
weed_neighbours: 'n'
weed_standard_dev: 1
weed_time_win: 730
weed_zero_elevation: 'n'
My code stopped here:
>> stamps(6,6)
STAMPS: ########################################
STAMPS: ####### StaMPS/MTI Version 4.0b6 #######
STAMPS: ####### Beta version, Jun 2018 #######
STAMPS: ########################################
STAMPS: Will process current directory only
STAMPS: ########################################
STAMPS: ################ Step 6 ################
STAMPS: ########################################
STAMPS: Directory is C:\Users\iling\Documents\MexicoCity\snap9\snap2stamps-2.0.1\INSAR_20180906
PS_UNWRAP: Starting
Phase-unwrapping...
GETPARM: small_baseline_flag='n'
GETPARM: unwrap_patch_phase='n'
GETPARM: scla_deramp='n'
GETPARM: subtr_tropo='n'
GETPARM: tropo_method='a_l'
GETPARM: tropo_method='a_l'
GETPARM: drop_ifg_index=
GETPARM: unwrap_hold_good_values='n'
PS_UNWRAP: Code to hold good values skipped
GETPARM: unwrap_time_win=730
GETPARM: unwrap_method='3D'
GETPARM: unwrap_grid_size=200
GETPARM: unwrap_gold_n_win=32
GETPARM: unwrap_prefilter_flag='y'
GETPARM: unwrap_gold_alpha=0.8
GETPARM: unwrap_la_error_flag='y'
GETPARM: unwrap_spatial_cost_func_flag='n'
PS_UNWRAP: Code to hold good values skipped
GETPARM: unwrap_time_win=730
GETPARM: unwrap_method='3D'
GETPARM: unwrap_grid_size=200
GETPARM: unwrap_gold_n_win=32
GETPARM: unwrap_prefilter_flag='y'
GETPARM: unwrap_gold_alpha=0.8
GETPARM: unwrap_la_error_flag='y'
GETPARM: unwrap_spatial_cost_func_flag='n'
GETPARM: max_topo_err=20
GETPARM: lambda=0.0554658
PS_UNWRAP: n_trial_wraps=0.112425
PS_UNWRAP: Windows detected: using old unwrapping code without statistical cost processing --> this line did not shown in the youtube IGARSS 2021video
GETPARM: lambda=0.0554658
PS_UNWRAP: n_trial_wraps=0.112425
PS_UNWRAP: Windows detected: using old unwrapping code without statistical cost processing --> this line did not shown in the youtube IGARSS 2021video
Triangulating...
Number of interferograms: 7
Number of points per ifg: 4008525
Number of interferograms: 7
Number of points per ifg: 4008525
I appreciate your time and help. Thanks.
Nguyen Thi Minh Trang
Mar 23, 2026, 1:13:00 AM (5 days ago) Mar 23
to MAINSAR
Hi Ai Ling,
Wishing you luck,
Nice to hear you've made progress!
I'm not familiar with the error you mentioned, but someone had a similar error here: https://forum.step.esa.int/t/stamps-error-mean-v-is-not-found/17169/7. Their fix is to add snaphu to path and run with a larger stack.
Do update us if you have an idea how to fix it in case someone run into the same problem!
Wishing you luck,
Trang
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