undef
s1a-ew-grd-vv-20160904t092233-20160904t092333-012901-014632-001_filter
s1a-ew-grd-vh-20160904t092233-20160904t092333-012901-014632-002_filter
s1a-ew-grd-vv-20160904t092233-20160904t092333-012901-014632-001_winddir
s1a-ew-grd-vh-20160904t092233-20160904t092333-012901-014632-002_winddir