GAMMA Questions

Hello everybody,

I’m using the script S1_coreg_TOPS in order to calculate the co-registration lookup tables of my Sentinel 1 TOPS SLC`s. Since I have no license for the LAT programs I do neither provide a polygon area for the intensity matching refinement iterations nor a polygon area for the spectral diversity method. According to the user`s guide the resampling should then be done for the entire area.
So far so good: the co-registration quality file says that there have been done several iterations using intensity matching until the azimuth correction determined is below the desired threshold (see example below). However the results for the spectral diversity method show that there is no azimuth shift in the burst overlap regions to be corrected (see example below). Of course this can`t be the case if the spectral diversity method would have been run properly. The screen output also gives some error messages when coming to the spectral diversity method, indicating that I have no valid license for LAT. Until now I thought that not having the LAT license only prevents running the spectral diversity method on restricted areas. But it seems to me as if the spectral diversity method is not applicable without the LAT programs in general. Is this right? Does anybody have any suggestions to get around it?

Thanks’ for your help,
Peter

Sentinel-1 TOPS coregistration quality file
###########################################
Mon Dec  7 17:51:28 CET 2015

command used:
S1_coreg_TOPS SLC_tab_20150816T080232 S1_20150816T080232 SLC_tab_20150828T080232 S1_20150828T080232 RSLC_tab_20150828T080232 S1_20150816T080232.hgt 10 2 - - 0.8 0.01 0.8 1 0 

reference: S1_20150816T080232 S1_20150816T080232.rslc S1_20150816T080232.rslc.par SLC_tab_20150816T080232
slave:     S1_20150828T080232 S1_20150828T080232.slc S1_20150828T080232.slc.par SLC_tab_20150828T080232
coregistered_slave:     S1_20150828T080232 S1_20150828T080232.rslc S1_20150828T080232.rslc.par RSLC_tab_20150828T080232
polygon used for matching (poly1):            -
polygon used for spectral diversity (poly2):  -

Iterative improvement of refinement offset using matching:
matching_iteration_1: -0.02458 0.01889    -0.012290 0.001889 (daz dr   daz_mli dr_mli)
matching_iteration_stdev_1: 0.1104 0.1483 (azimuth_stdev range_stdev)
matching_iteration_2: 0.01043 0.02685    0.005215 0.002685 (daz dr   daz_mli dr_mli)
matching_iteration_stdev_2: 0.1008 0.0991 (azimuth_stdev range_stdev)
matching_iteration_3: -0.01777 -0.00240    -0.008885 -0.000240 (daz dr   daz_mli dr_mli)
matching_iteration_stdev_3: 0.1027 0.1454 (azimuth_stdev range_stdev)
matching_iteration_4: -0.00548 -0.00233    -0.002740 -0.000233 (daz dr   daz_mli dr_mli)
matching_iteration_stdev_4: 0.1052 0.1446 (azimuth_stdev range_stdev)

Iterative improvement of refinement offset azimuth overlap regions:
az_ovr_iteration_1: -0.000000 (daz in SLC pixel)
S1_20150816T080232_S1_20150828T080232.results
thresholds applied: cc_thresh: 0.8,  ph_fraction_thresh: 0.01, ph_stdev_thresh (rad): 0.8

IW  overlap  ph_mean ph_stdev ph_fraction   (cc_mean cc_stdev cc_fraction)    weight
IW1 1 0.00000 0.00000 0.00000 (2.984507e-01 3.979533e-02 0.645177) 0.000000
IW1 2 0.00000 0.00000 0.00000 (2.963383e-01 5.180170e-02 0.645177) 0.000000
IW1 3 0.00000 0.00000 0.00000 (2.520362e-01 2.541451e-02 0.640293) 0.000000
IW1 4 0.00000 0.00000 0.00000 (2.325673e-01 2.010380e-02 0.638584) 0.000000
IW1 5 0.00000 0.00000 0.00000 (3.229916e-01 3.486487e-02 0.624664) 0.000000
IW1 6 0.00000 0.00000 0.00000 (4.166989e-01 6.170267e-02 0.638584) 0.000000
IW1 7 0.00000 0.00000 0.00000 (3.209803e-01 4.914372e-02 0.638584) 0.000000
IW1 8 0.00000 0.00000 0.00000 (3.182389e-01 5.488744e-02 0.638584) 0.000000
IW1 0.0
IW2 1 0.00000 0.00000 0.00000 (3.435286e-01 6.750967e-02 0.597264) 0.000000
IW2 2 0.00000 0.00000 0.00000 (3.529852e-01 5.677646e-02 0.597264) 0.000000
IW2 3 0.00000 0.00000 0.00000 (3.418106e-01 4.045974e-02 0.595281) 0.000000
IW2 4 0.00000 0.00000 0.00000 (2.965673e-01 2.555992e-02 0.583978) 0.000000
IW2 5 0.00000 0.00000 0.00000 (2.452194e-01 1.960469e-02 0.597264) 0.000000
IW2 6 0.00000 0.00000 0.00000 (2.603265e-01 2.901501e-02 0.591116) 0.000000
IW2 7 0.00000 0.00000 0.00000 (4.144340e-01 8.276679e-02 0.591116) 0.000000
IW2 8 0.00000 0.00000 0.00000 (2.966930e-01 3.819242e-02 0.602419) 0.000000
IW2 0.0
IW3 1 0.00000 0.00000 0.00000 (2.831757e-01 2.740909e-02 0.601353) 0.000000
IW3 2 0.00000 0.00000 0.00000 (3.546488e-01 5.897012e-02 0.587825) 0.000000
IW3 3 0.00000 0.00000 0.00000 (2.898602e-01 3.843934e-02 0.589875) 0.000000
IW3 4 0.00000 0.00000 0.00000 (2.539516e-01 2.552547e-02 0.578192) 0.000000
IW3 5 0.00000 0.00000 0.00000 (2.406891e-01 1.555846e-02 0.561795) 0.000000
IW3 6 0.00000 0.00000 0.00000 (2.051314e-01 1.420483e-02 0.573068) 0.000000
IW3 7 0.00000 0.00000 0.00000 (2.058113e-01 1.040995e-02 0.573478) 0.000000
IW3 8 0.00000 0.00000 0.00000 (2.041913e-01 1.156340e-02 0.584751) 0.000000
IW3 0.0
all 0.0
azimuth_pixel_offset -0.000000 [azimuth SLC pixel]

Generated differential interferogram S1_20150816T080232_S1_20150828T080232.diff
to display use:   eog S1_20150816T080232_S1_20150828T080232.diff.ras &

end of S1_coreg_TOPS
Mon Dec  7 19:56:27 CET 2015