undef

s1b-iw-grd-vh-20170805t174821-20170805t174846-006808-00bfa5-002_filter

s1b-iw-grd-vv-20170805t174821-20170805t174846-006808-00bfa5-001_filter

s1b-iw-grd-vv-20170805t174821-20170805t174846-006808-00bfa5-001_winddir

s1b-iw-grd-vh-20170805t174821-20170805t174846-006808-00bfa5-002_winddir