undef

s1a-ew-grd-vh-20180809t013808-20180809t013908-023163-02842f-002_filter

s1a-ew-grd-vv-20180809t013808-20180809t013908-023163-02842f-001_filter

s1a-ew-grd-vh-20180809t013808-20180809t013908-023163-02842f-002_winddir

s1a-ew-grd-vv-20180809t013808-20180809t013908-023163-02842f-001_winddir