undef

s1a-iw-grd-vv-20170622t215229-20170622t215303-017152-01c993-001_filter

s1a-iw-grd-vh-20170622t215229-20170622t215303-017152-01c993-002_filter

s1a-iw-grd-vv-20170622t215229-20170622t215303-017152-01c993-001_winddir

s1a-iw-grd-vh-20170622t215229-20170622t215303-017152-01c993-002_winddir