undef
s1b-ew-grd-vv-20180727t202802-20180727t202902-012001-016188-001_filter
s1b-ew-grd-vh-20180727t202802-20180727t202902-012001-016188-002_filter
s1b-ew-grd-vv-20180727t202802-20180727t202902-012001-016188-001_winddir
s1b-ew-grd-vh-20180727t202802-20180727t202902-012001-016188-002_winddir