undef

s1a-iw-grd-hh-20140620t174531-20140620t174556-001137-0011bc-001_filter

s1a-iw-grd-hv-20140620t174531-20140620t174556-001137-0011bc-002_filter

s1a-iw-grd-hv-20140620t174531-20140620t174556-001137-0011bc-002_winddir

s1a-iw-grd-hh-20140620t174531-20140620t174556-001137-0011bc-001_winddir