undef

s1a-ew-grd-vv-20180808t041407-20180808t041507-023150-0283bf-001_filter

s1a-ew-grd-vh-20180808t041407-20180808t041507-023150-0283bf-002_filter

s1a-ew-grd-vv-20180808t041407-20180808t041507-023150-0283bf-001_winddir

s1a-ew-grd-vh-20180808t041407-20180808t041507-023150-0283bf-002_winddir