undef
s1b-iw-grd-vh-20190905t214246-20190905t214311-017908-021b40-002_filter
s1b-iw-grd-vv-20190905t214246-20190905t214311-017908-021b40-001_filter
s1b-iw-grd-vv-20190905t214246-20190905t214311-017908-021b40-001_winddir
s1b-iw-grd-vh-20190905t214246-20190905t214311-017908-021b40-002_winddir