undef

s1a-iw-grd-vh-20160414t100020-20160414t100049-010816-0102d1-002_filter

s1a-iw-grd-vv-20160414t100020-20160414t100049-010816-0102d1-001_filter

s1a-iw-grd-vv-20160414t100020-20160414t100049-010816-0102d1-001_winddir

s1a-iw-grd-vh-20160414t100020-20160414t100049-010816-0102d1-002_winddir