undef

s1a-iw-grd-vv-20160411t175832-20160411t175857-010777-010197-001_filter

s1a-iw-grd-vh-20160411t175832-20160411t175857-010777-010197-002_filter

s1a-iw-grd-vv-20160411t175832-20160411t175857-010777-010197-001_winddir

s1a-iw-grd-vh-20160411t175832-20160411t175857-010777-010197-002_winddir