hello
i obtain gaps between 2 coherence images obtained from 2 adjacent acquisitions between S-1A and S-1B.
For example, with the following products:
S1A_IW_SLC__1SDV_20161002T055854_20161002T055921_013307_01535A_FEAA.zip+S1B_IW_SLC__1SDV_20161008T055810_20161008T055837_002411_004122_076C.zip
S1A_IW_SLC__1SDV_20161002T055919_20161002T055947_013307_01535A_3694.zip+S1B_IW_SLC__1SDV_20161008T055834_20161008T055902_002411_004122_CBA6.zip
we obtain the image here attached. And of course our study site is exactly within the gap.
I think the reason for the gaps are that S1A and S1B tiles (slices) are not fully overlapping and the coherence is calculated only for the overlapping area. You can assemble the consecutive slices for S1A and S1B and then proceed with coherence.
I got an out of memory error when trying to assemble slices in snap version 5.0.0
java.lang.OutOfMemoryError: Java heap space
Dumping heap to /home/cmarin/.snap/var/log/heapdump.hprof …
Heap dump file created [6563355875 bytes in 13.210 secs]
Looking to the size of heapdump created I think there is something serious going on here. I am using a machine with 32GB RAM (is this enough ??)
32GB is enough for coherence estimation. There are several forum topics about “Java heap space error”, try to search for them. I guess you just have to adjust the cache size (or other memory related settings) in the SNAP settings --> Tools/Options/Performance.
