undef
s1a-iw-grd-vv-20210619t125029-20210619t125054-038409-04884e-001_filter
s1a-iw-grd-vh-20210619t125029-20210619t125054-038409-04884e-002_filter
s1a-iw-grd-vv-20210619t125029-20210619t125054-038409-04884e-001_winddir
s1a-iw-grd-vh-20210619t125029-20210619t125054-038409-04884e-002_winddir