undef

s1a-iw-grd-vv-20160926t214436-20160926t214501-013229-0150dc-001_filter

s1a-iw-grd-vh-20160926t214436-20160926t214501-013229-0150dc-002_filter

s1a-iw-grd-vv-20160926t214436-20160926t214501-013229-0150dc-001_winddir

s1a-iw-grd-vh-20160926t214436-20160926t214501-013229-0150dc-002_winddir