undef

s1b-iw-grd-vh-20170915t175750-20170915t175815-007406-00d116-002_filter

s1b-iw-grd-vv-20170915t175750-20170915t175815-007406-00d116-001_filter

s1b-iw-grd-vv-20170915t175750-20170915t175815-007406-00d116-001_winddir

s1b-iw-grd-vh-20170915t175750-20170915t175815-007406-00d116-002_winddir