undef

s1b-ew-grd-vv-20180818t083657-20180818t083801-012315-016b1d-001_filter

s1b-ew-grd-vh-20180818t083657-20180818t083801-012315-016b1d-002_filter

s1b-ew-grd-vv-20180818t083657-20180818t083801-012315-016b1d-001_winddir

s1b-ew-grd-vh-20180818t083657-20180818t083801-012315-016b1d-002_winddir