undef

s1b-iw-grd-vv-20180715t100015-20180715t100044-011820-015c04-001_filter

s1b-iw-grd-vh-20180715t100015-20180715t100044-011820-015c04-002_filter

s1b-iw-grd-vv-20180715t100015-20180715t100044-011820-015c04-001_winddir

s1b-iw-grd-vh-20180715t100015-20180715t100044-011820-015c04-002_winddir