undef

s1a-iw-grd-vh-20161017t062153-20161017t062218-013526-015a40-002_filter

s1a-iw-grd-vv-20161017t062153-20161017t062218-013526-015a40-001_filter

s1a-iw-grd-vh-20161017t062153-20161017t062218-013526-015a40-002_winddir

s1a-iw-grd-vv-20161017t062153-20161017t062218-013526-015a40-001_winddir