undef

s1a-iw-grd-vv-20180107t175836-20180107t175901-020052-0222b0-001_filter

s1a-iw-grd-vh-20180107t175836-20180107t175901-020052-0222b0-002_filter

s1a-iw-grd-vh-20180107t175836-20180107t175901-020052-0222b0-002_winddir

s1a-iw-grd-vv-20180107t175836-20180107t175901-020052-0222b0-001_winddir