undef

s1a-ew-grd-hv-20181205t152713-20181205t152813-024892-02bdcd-002_filter

s1a-ew-grd-hh-20181205t152713-20181205t152813-024892-02bdcd-001_filter

s1a-ew-grd-hh-20181205t152713-20181205t152813-024892-02bdcd-001_winddir

s1a-ew-grd-hv-20181205t152713-20181205t152813-024892-02bdcd-002_winddir