undef

s1b-iw-grd-vh-20180914t111505-20180914t111530-012710-017758-002_filter

s1b-iw-grd-vv-20180914t111505-20180914t111530-012710-017758-001_filter

s1b-iw-grd-vv-20180914t111505-20180914t111530-012710-017758-001_winddir

s1b-iw-grd-vh-20180914t111505-20180914t111530-012710-017758-002_winddir