undef

s1a-iw-grd-vv-20180824t084401-20180824t084426-023386-028b5c-001_filter

s1a-iw-grd-vh-20180824t084401-20180824t084426-023386-028b5c-002_filter

s1a-iw-grd-vh-20180824t084401-20180824t084426-023386-028b5c-002_winddir

s1a-iw-grd-vv-20180824t084401-20180824t084426-023386-028b5c-001_winddir