undef

s1a-iw-grd-vv-20170809t215202-20170809t215231-017852-01dee1-001_filter

s1a-iw-grd-vh-20170809t215202-20170809t215231-017852-01dee1-002_filter

s1a-iw-grd-vh-20170809t215202-20170809t215231-017852-01dee1-002_winddir

s1a-iw-grd-vv-20170809t215202-20170809t215231-017852-01dee1-001_winddir