undef

s1a-iw-grd-vh-20180224t175835-20180224t175900-020752-023903-002_filter

s1a-iw-grd-vv-20180224t175835-20180224t175900-020752-023903-001_filter

s1a-iw-grd-vh-20180224t175835-20180224t175900-020752-023903-002_winddir

s1a-iw-grd-vv-20180224t175835-20180224t175900-020752-023903-001_winddir