undef

s1a-iw-grd-vv-20180920t122005-20180920t122030-023782-02980d-001_filter

s1a-iw-grd-vh-20180920t122005-20180920t122030-023782-02980d-002_filter

s1a-iw-grd-vv-20180920t122005-20180920t122030-023782-02980d-001_winddir

s1a-iw-grd-vh-20180920t122005-20180920t122030-023782-02980d-002_winddir