undef

s1b-iw-grd-vh-20170613t062916-20170613t062941-006028-00a94f-002_filter

s1b-iw-grd-vv-20170613t062916-20170613t062941-006028-00a94f-001_filter

s1b-iw-grd-vv-20170613t062916-20170613t062941-006028-00a94f-001_winddir

s1b-iw-grd-vh-20170613t062916-20170613t062941-006028-00a94f-002_winddir