undef

s1a-iw-grd-vv-20180714t100954-20180714t101019-022789-027870-001_filter

s1a-iw-grd-vh-20180714t100954-20180714t101019-022789-027870-002_filter

s1a-iw-grd-vv-20180714t100954-20180714t101019-022789-027870-001_winddir

s1a-iw-grd-vh-20180714t100954-20180714t101019-022789-027870-002_winddir