undef

s1a-ew-grd-vh-20180812t172848-20180812t172953-023216-0285e5-002_filter

s1a-ew-grd-vv-20180812t172848-20180812t172953-023216-0285e5-001_filter

s1a-ew-grd-vh-20180812t172848-20180812t172953-023216-0285e5-002_winddir

s1a-ew-grd-vv-20180812t172848-20180812t172953-023216-0285e5-001_winddir