undef

s1a-iw-grd-vv-20180711t215236-20180711t215310-022752-02774f-001_filter

s1a-iw-grd-vh-20180711t215236-20180711t215310-022752-02774f-002_filter

s1a-iw-grd-vh-20180711t215236-20180711t215310-022752-02774f-002_winddir

s1a-iw-grd-vv-20180711t215236-20180711t215310-022752-02774f-001_winddir