undef

s1a-iw-grd-vh-20180822t210103-20180822t210128-023364-028aa9-002_filter

s1a-iw-grd-vv-20180822t210103-20180822t210128-023364-028aa9-001_filter

s1a-iw-grd-vv-20180822t210103-20180822t210128-023364-028aa9-001_winddir

s1a-iw-grd-vh-20180822t210103-20180822t210128-023364-028aa9-002_winddir