The backgeocoding step in IW SLC coregistration fails to advance because it continues to look for a non-existing SRTM tile:
http://step.esa.int/auxdata/dem/SRTMGL1/N52E003.SRTMGL1.hgt.zip
(indeed non-existing, because in the North Sea). I started a gpt batch late Friday and discovered this morning that it did not work.
I will create a dummy tile in .snap to be able to continue, but this is a somewhat silly issue. Instead of using a LUT with missing tiles, the program should check whether the URL exists, and assume zero height if is does not.
It throws these errors now:
INFO: org.esa.snap.core.dataop.dem.ElevationFile: http retrieving http://step.esa.int/auxdata/dem/SRTMGL1/N52E003.SRTMGL1.hgt.zip
SEVERE: org.esa.snap.core.dataop.dem.ElevationFile: Connection refused
which is not correct (it is not a connection refused exception).
Guido