undef

s1a-iw-grd-vh-20171006t100126-20171006t100151-018691-01f888-002_filter

s1a-iw-grd-vv-20171006t100126-20171006t100151-018691-01f888-001_filter

s1a-iw-grd-vh-20171006t100126-20171006t100151-018691-01f888-002_winddir

s1a-iw-grd-vv-20171006t100126-20171006t100151-018691-01f888-001_winddir