I did not- however, after running stamps in Matlab, I receive this message during step 3,
"Warning: Not enough random phase pixels to set gamma threshold - using default threshold of 0.3
In ps_select (line 184)
In stamps (line 356) "
And at then at the end:
"Index exceeds the number of array elements (0).
Error in llh2local (line 41)
dlambda=llh(1,z)-origin(1);
Error in ps_merge_patches (line 485)
xy=llh2local(lonlat’,ll0)*1000;
Error in stamps (line 473)
ps_merge_patches"
I set the ‘density_rand’ parameter to 50, and then 90, but still got the same errors.
Apparently none of the PS candidates are being selected, although step 2 consistently indicates multiple tens of thousands of candidates.
I’ve tried using setparm(‘percent_rand’, 60) instead of density,
and setparm(‘filter_grid_size’, 10), as suggested here Linux Installation using StaMPS and S-1 data - the error persists.
My study area (2 bursts) does contain lake areas- however, it is surrounded by densely urbanized regions on all sides except the north:
LONMIN=-97.1843
LATMIN=33.0559
LONMAX=-96.2829
LATMAX=33.3571
I’ve also noticed that in some patch folders the file pscands.1.ij.int are much smaller (few hundred kB) and they have what appears to be an erroneous icon (black rectangle), whereas the rest are ~2 Mb in size and they have a white sheet icon.
Assuming the interferograms are correct, to what else could this be related?