undef

s1b-iw-grd-vh-20180519t151721-20180519t151746-010992-014209-002_filter

s1b-iw-grd-vv-20180519t151721-20180519t151746-010992-014209-001_filter

s1b-iw-grd-vv-20180519t151721-20180519t151746-010992-014209-001_winddir

s1b-iw-grd-vh-20180519t151721-20180519t151746-010992-014209-002_winddir