undef

s1a-iw-grd-vv-20180223t205940-20180223t210005-020739-023897-001_filter

s1a-iw-grd-vh-20180223t205940-20180223t210005-020739-023897-002_filter

s1a-iw-grd-vv-20180223t205940-20180223t210005-020739-023897-001_winddir

s1a-iw-grd-vh-20180223t205940-20180223t210005-020739-023897-002_winddir