undef

s1b-iw-grd-vv-20180425t084914-20180425t084943-010638-0136a2-001_filter

s1b-iw-grd-vh-20180425t084914-20180425t084943-010638-0136a2-002_filter

s1b-iw-grd-vv-20180425t084914-20180425t084943-010638-0136a2-001_winddir

s1b-iw-grd-vh-20180425t084914-20180425t084943-010638-0136a2-002_winddir