undef

s1b-iw-grd-vh-20180929t092801-20180929t092826-012928-017e09-002_filter

s1b-iw-grd-vv-20180929t092801-20180929t092826-012928-017e09-001_filter

s1b-iw-grd-vv-20180929t092801-20180929t092826-012928-017e09-001_winddir

s1b-iw-grd-vh-20180929t092801-20180929t092826-012928-017e09-002_winddir