undef

s1a-iw-grd-vh-20180208t100919-20180208t100948-020514-023172-002_filter

s1a-iw-grd-vv-20180208t100919-20180208t100948-020514-023172-001_filter

s1a-iw-grd-vh-20180208t100919-20180208t100948-020514-023172-002_winddir

s1a-iw-grd-vv-20180208t100919-20180208t100948-020514-023172-001_winddir