undef

s1a-iw-grd-vv-20180316t204737-20180316t204802-021045-024251-001_filter

s1a-iw-grd-vh-20180316t204737-20180316t204802-021045-024251-002_filter

s1a-iw-grd-vh-20180316t204737-20180316t204802-021045-024251-002_winddir

s1a-iw-grd-vv-20180316t204737-20180316t204802-021045-024251-001_winddir