undef

s1a-iw-grd-vh-20180616t004727-20180616t004752-022375-026c31-002_filter

s1a-iw-grd-vv-20180616t004727-20180616t004752-022375-026c31-001_filter

s1a-iw-grd-vh-20180616t004727-20180616t004752-022375-026c31-002_winddir

s1a-iw-grd-vv-20180616t004727-20180616t004752-022375-026c31-001_winddir