undef

s1a-ew-grd-vh-20181013t071651-20181013t071751-024114-02a2e9-002_filter

s1a-ew-grd-vv-20181013t071651-20181013t071751-024114-02a2e9-001_filter

s1a-ew-grd-vh-20181013t071651-20181013t071751-024114-02a2e9-002_winddir

s1a-ew-grd-vv-20181013t071651-20181013t071751-024114-02a2e9-001_winddir