undef

s1b-ew-grd-vh-20180903t030713-20180903t030813-012545-017246-002_filter

s1b-ew-grd-vv-20180903t030713-20180903t030813-012545-017246-001_filter

s1b-ew-grd-vv-20180903t030713-20180903t030813-012545-017246-001_winddir

s1b-ew-grd-vh-20180903t030713-20180903t030813-012545-017246-002_winddir