undef

s1a-iw-grd-vh-20170908t220307-20170908t220332-018290-01ec26-002_filter

s1a-iw-grd-vv-20170908t220307-20170908t220332-018290-01ec26-001_filter

s1a-iw-grd-vv-20170908t220307-20170908t220332-018290-01ec26-001_winddir

s1a-iw-grd-vh-20170908t220307-20170908t220332-018290-01ec26-002_winddir