undef
s1b-iw-grd-vv-20180929t092826-20180929t092851-012928-017e09-001_filter
s1b-iw-grd-vh-20180929t092826-20180929t092851-012928-017e09-002_filter
s1b-iw-grd-vh-20180929t092826-20180929t092851-012928-017e09-002_winddir
s1b-iw-grd-vv-20180929t092826-20180929t092851-012928-017e09-001_winddir