undef

s1b-iw-grd-hv-20160922t063213-20160922t063226-002178-003a7b-002_filter

s1b-iw-grd-hh-20160922t063213-20160922t063226-002178-003a7b-001_filter

s1b-iw-grd-hv-20160922t063213-20160922t063226-002178-003a7b-002_winddir

s1b-iw-grd-hh-20160922t063213-20160922t063226-002178-003a7b-001_winddir