undef

s1a-iw-grd-vv-20180101t102457-20180101t102526-019960-021fd7-001_filter

s1a-iw-grd-vh-20180101t102457-20180101t102526-019960-021fd7-002_filter

s1a-iw-grd-vv-20180101t102457-20180101t102526-019960-021fd7-001_winddir

s1a-iw-grd-vh-20180101t102457-20180101t102526-019960-021fd7-002_winddir