undef

s1a-iw-grd-vh-20170717t205141-20170717t205207-017516-01d49e-002_filter

s1a-iw-grd-vv-20170717t205141-20170717t205207-017516-01d49e-001_filter

s1a-iw-grd-vv-20170717t205141-20170717t205207-017516-01d49e-001_winddir

s1a-iw-grd-vh-20170717t205141-20170717t205207-017516-01d49e-002_winddir