undef

s1a-iw-grd-vh-20190903t111836-20190903t111901-028856-03451e-002_filter

s1a-iw-grd-vv-20190903t111836-20190903t111901-028856-03451e-001_filter

s1a-iw-grd-vv-20190903t111836-20190903t111901-028856-03451e-001_winddir

s1a-iw-grd-vh-20190903t111836-20190903t111901-028856-03451e-002_winddir