undef

s1b-ew-grd-hh-20170102t152714-20170102t152818-003671-0064ca-001_filter

s1b-ew-grd-hv-20170102t152714-20170102t152818-003671-0064ca-002_filter

s1b-ew-grd-hh-20170102t152714-20170102t152818-003671-0064ca-001_winddir

s1b-ew-grd-hv-20170102t152714-20170102t152818-003671-0064ca-002_winddir