undef

s1b-iw-grd-vv-20170712t174934-20170712t174959-006458-00b5a4-001_filter

s1b-iw-grd-vh-20170712t174934-20170712t174959-006458-00b5a4-002_filter

s1b-iw-grd-vh-20170712t174934-20170712t174959-006458-00b5a4-002_winddir

s1b-iw-grd-vv-20170712t174934-20170712t174959-006458-00b5a4-001_winddir