undef

s1a-iw-grd-vv-20180906t190953-20180906t191018-023582-0291a5-001_filter

s1a-iw-grd-vh-20180906t190953-20180906t191018-023582-0291a5-002_filter

s1a-iw-grd-vv-20180906t190953-20180906t191018-023582-0291a5-001_winddir

s1a-iw-grd-vh-20180906t190953-20180906t191018-023582-0291a5-002_winddir