undef

s1b-iw-grd-vh-20180430t085740-20180430t085752-010711-013902-002_filter

s1b-iw-grd-vv-20180430t085740-20180430t085752-010711-013902-001_filter

s1b-iw-grd-vv-20180430t085740-20180430t085752-010711-013902-001_winddir

s1b-iw-grd-vh-20180430t085740-20180430t085752-010711-013902-002_winddir