undef

s1a-ew-grd-vv-20180803t143803-20180803t143907-023083-0281a1-001_filter

s1a-ew-grd-vh-20180803t143803-20180803t143907-023083-0281a1-002_filter

s1a-ew-grd-vv-20180803t143803-20180803t143907-023083-0281a1-001_winddir

s1a-ew-grd-vh-20180803t143803-20180803t143907-023083-0281a1-002_winddir