undef

s1a-iw-grd-vh-20180127t100948-20180127t101013-020339-022bdb-002_filter

s1a-iw-grd-vv-20180127t100948-20180127t101013-020339-022bdb-001_filter

s1a-iw-grd-vv-20180127t100948-20180127t101013-020339-022bdb-001_winddir

s1a-iw-grd-vh-20180127t100948-20180127t101013-020339-022bdb-002_winddir