undef

s1b-iw-grd-vh-20161016t062932-20161016t062957-002528-00444b-002_filter

s1b-iw-grd-vv-20161016t062932-20161016t062957-002528-00444b-001_filter

s1b-iw-grd-vv-20161016t062932-20161016t062957-002528-00444b-001_winddir

s1b-iw-grd-vh-20161016t062932-20161016t062957-002528-00444b-002_winddir