undef

s1b-ew-grd-vh-20180818t083901-20180818t084001-012315-016b1d-002_filter

s1b-ew-grd-vv-20180818t083901-20180818t084001-012315-016b1d-001_filter

s1b-ew-grd-vh-20180818t083901-20180818t084001-012315-016b1d-002_winddir

s1b-ew-grd-vv-20180818t083901-20180818t084001-012315-016b1d-001_winddir