undef

s1a-ew-grd-vh-20160826t133953-20160826t134056-012772-0141f0-002_filter

s1a-ew-grd-vv-20160826t133953-20160826t134056-012772-0141f0-001_filter

s1a-ew-grd-vv-20160826t133953-20160826t134056-012772-0141f0-001_winddir

s1a-ew-grd-vh-20160826t133953-20160826t134056-012772-0141f0-002_winddir