undef

s1a-ew-grd-vv-20160827t205258-20160827t205358-012791-014285-001_filter

s1a-ew-grd-vh-20160827t205258-20160827t205358-012791-014285-002_filter

s1a-ew-grd-vv-20160827t205258-20160827t205358-012791-014285-001_winddir

s1a-ew-grd-vh-20160827t205258-20160827t205358-012791-014285-002_winddir