undef

s1a-ew-grd-vh-20180928t133207-20180928t133311-023899-029bdd-002_filter

s1a-ew-grd-vv-20180928t133207-20180928t133311-023899-029bdd-001_filter

s1a-ew-grd-vv-20180928t133207-20180928t133311-023899-029bdd-001_winddir

s1a-ew-grd-vh-20180928t133207-20180928t133311-023899-029bdd-002_winddir