undef
s1a-iw-grd-vv-20190903t111746-20190903t111811-028856-03451e-001_filter
s1a-iw-grd-vh-20190903t111746-20190903t111811-028856-03451e-002_filter
s1a-iw-grd-vv-20190903t111746-20190903t111811-028856-03451e-001_winddir
s1a-iw-grd-vh-20190903t111746-20190903t111811-028856-03451e-002_winddir