undef

s1b-iw-grd-vv-20180424t215144-20180424t215201-010631-01366c-001_filter

s1b-iw-grd-vh-20180424t215144-20180424t215201-010631-01366c-002_filter

s1b-iw-grd-vv-20180424t215144-20180424t215201-010631-01366c-001_winddir

s1b-iw-grd-vh-20180424t215144-20180424t215201-010631-01366c-002_winddir