undef

s1a-ew-grd-vv-20160920t215441-20160920t215541-013142-014e08-001_filter

s1a-ew-grd-vh-20160920t215441-20160920t215541-013142-014e08-002_filter

s1a-ew-grd-vv-20160920t215441-20160920t215541-013142-014e08-001_winddir

s1a-ew-grd-vh-20160920t215441-20160920t215541-013142-014e08-002_winddir