undef

s1a-iw-grd-vv-20160926t214317-20160926t214346-013229-0150dc-001_filter

s1a-iw-grd-vh-20160926t214317-20160926t214346-013229-0150dc-002_filter

s1a-iw-grd-vv-20160926t214317-20160926t214346-013229-0150dc-001_winddir

s1a-iw-grd-vh-20160926t214317-20160926t214346-013229-0150dc-002_winddir