undef

s1a-iw-grd-vv-20210829t000137-20210829t000202-039437-04a8b3-001_filter

s1a-iw-grd-vh-20210829t000137-20210829t000202-039437-04a8b3-002_filter

s1a-iw-grd-vh-20210829t000137-20210829t000202-039437-04a8b3-002_winddir

s1a-iw-grd-vv-20210829t000137-20210829t000202-039437-04a8b3-001_winddir