undef

s1a-ew-grd-hv-20160606t170101-20160606t170201-011593-011b6e-002_filter

s1a-ew-grd-hh-20160606t170101-20160606t170201-011593-011b6e-001_filter

s1a-ew-grd-hh-20160606t170101-20160606t170201-011593-011b6e-001_winddir

s1a-ew-grd-hv-20160606t170101-20160606t170201-011593-011b6e-002_winddir