undef
s1a-ew-grd-vv-20180803t022607-20180803t022707-023076-02815f-001_filter
s1a-ew-grd-vh-20180803t022607-20180803t022707-023076-02815f-002_filter
s1a-ew-grd-vv-20180803t022607-20180803t022707-023076-02815f-001_winddir
s1a-ew-grd-vh-20180803t022607-20180803t022707-023076-02815f-002_winddir