undef

s1a-iw-grd-vh-20180806t011220-20180806t011245-023119-0282cd-002_filter

s1a-iw-grd-vv-20180806t011220-20180806t011245-023119-0282cd-001_filter

s1a-iw-grd-vh-20180806t011220-20180806t011245-023119-0282cd-002_winddir

s1a-iw-grd-vv-20180806t011220-20180806t011245-023119-0282cd-001_winddir