undef

s1a-iw-grd-vv-20161125t214634-20161125t214659-014104-016c24-001_filter

s1a-iw-grd-vh-20161125t214634-20161125t214659-014104-016c24-002_filter

s1a-iw-grd-vv-20161125t214634-20161125t214659-014104-016c24-001_winddir

s1a-iw-grd-vh-20161125t214634-20161125t214659-014104-016c24-002_winddir