undef

s1a-iw-grd-vv-20170818t222630-20170818t222655-017984-01e2e2-001_filter

s1a-iw-grd-vh-20170818t222630-20170818t222655-017984-01e2e2-002_filter

s1a-iw-grd-vv-20170818t222630-20170818t222655-017984-01e2e2-001_winddir

s1a-iw-grd-vh-20170818t222630-20170818t222655-017984-01e2e2-002_winddir