undef

s1a-ew-grd-vh-20180907t213205-20180907t213309-023598-029225-002_filter

s1a-ew-grd-vv-20180907t213205-20180907t213309-023598-029225-001_filter

s1a-ew-grd-vh-20180907t213205-20180907t213309-023598-029225-002_winddir

s1a-ew-grd-vv-20180907t213205-20180907t213309-023598-029225-001_winddir