undef

s1b-iw-grd-vh-20170517t085705-20170517t085734-005636-009df1-002_filter

s1b-iw-grd-vv-20170517t085705-20170517t085734-005636-009df1-001_filter

s1b-iw-grd-vh-20170517t085705-20170517t085734-005636-009df1-002_winddir

s1b-iw-grd-vv-20170517t085705-20170517t085734-005636-009df1-001_winddir