undef

s1a-iw-grd-vh-20180101t205118-20180101t205143-019966-022010-002_filter

s1a-iw-grd-vv-20180101t205118-20180101t205143-019966-022010-001_filter

s1a-iw-grd-vh-20180101t205118-20180101t205143-019966-022010-002_winddir

s1a-iw-grd-vv-20180101t205118-20180101t205143-019966-022010-001_winddir