undef

s1b-ew-grd-hv-20170709t092043-20170709t092147-006409-00b448-002_filter

s1b-ew-grd-hh-20170709t092043-20170709t092147-006409-00b448-001_filter

s1b-ew-grd-hv-20170709t092043-20170709t092147-006409-00b448-002_winddir

s1b-ew-grd-hh-20170709t092043-20170709t092147-006409-00b448-001_winddir