undef
s1a-ew-grd-vh-20180925t212110-20180925t212211-023860-029aa3-002_filter
s1a-ew-grd-vv-20180925t212110-20180925t212211-023860-029aa3-001_filter
s1a-ew-grd-vv-20180925t212110-20180925t212211-023860-029aa3-001_winddir
s1a-ew-grd-vh-20180925t212110-20180925t212211-023860-029aa3-002_winddir