undef

s1a-iw-grd-vh-20171104t100951-20171104t101016-019114-020569-002_filter

s1a-iw-grd-vv-20171104t100951-20171104t101016-019114-020569-001_filter

s1a-iw-grd-vh-20171104t100951-20171104t101016-019114-020569-002_winddir

s1a-iw-grd-vv-20171104t100951-20171104t101016-019114-020569-001_winddir