undef

s1a-iw-grd-vh-20160724t100859-20160724t100928-012289-0131c5-002_filter

s1a-iw-grd-vv-20160724t100859-20160724t100928-012289-0131c5-001_filter

s1a-iw-grd-vv-20160724t100859-20160724t100928-012289-0131c5-001_winddir

s1a-iw-grd-vh-20160724t100859-20160724t100928-012289-0131c5-002_winddir