undef

s1a-ew-grd-vh-20180928t093608-20180928t093708-023897-029bc7-002_filter

s1a-ew-grd-vv-20180928t093608-20180928t093708-023897-029bc7-001_filter

s1a-ew-grd-vv-20180928t093608-20180928t093708-023897-029bc7-001_winddir

s1a-ew-grd-vh-20180928t093608-20180928t093708-023897-029bc7-002_winddir