undef

s1a-iw-grd-vh-20180831t100957-20180831t101022-023489-028ea8-002_filter

s1a-iw-grd-vv-20180831t100957-20180831t101022-023489-028ea8-001_filter

s1a-iw-grd-vv-20180831t100957-20180831t101022-023489-028ea8-001_winddir

s1a-iw-grd-vh-20180831t100957-20180831t101022-023489-028ea8-002_winddir