undef

s1a-iw-grd-vh-20170902t215203-20170902t215232-018202-01e971-002_filter

s1a-iw-grd-vv-20170902t215203-20170902t215232-018202-01e971-001_filter

s1a-iw-grd-vh-20170902t215203-20170902t215232-018202-01e971-002_winddir

s1a-iw-grd-vv-20170902t215203-20170902t215232-018202-01e971-001_winddir