undef

s1a-ew-grd-vh-20180929t020208-20180929t020308-023907-029c16-002_filter

s1a-ew-grd-vv-20180929t020208-20180929t020308-023907-029c16-001_filter

s1a-ew-grd-vh-20180929t020208-20180929t020308-023907-029c16-002_winddir

s1a-ew-grd-vv-20180929t020208-20180929t020308-023907-029c16-001_winddir