undef

s1b-iw-grd-vv-20190904t110909-20190904t110934-017887-021a9d-001_filter

s1b-iw-grd-vh-20190904t110909-20190904t110934-017887-021a9d-002_filter

s1b-iw-grd-vh-20190904t110909-20190904t110934-017887-021a9d-002_winddir

s1b-iw-grd-vv-20190904t110909-20190904t110934-017887-021a9d-001_winddir