undef

s1a-ew-grd-vh-20180831t033208-20180831t033308-023485-028e87-002_filter

s1a-ew-grd-vv-20180831t033208-20180831t033308-023485-028e87-001_filter

s1a-ew-grd-vv-20180831t033208-20180831t033308-023485-028e87-001_winddir

s1a-ew-grd-vh-20180831t033208-20180831t033308-023485-028e87-002_winddir