undef

s1b-iw-grd-hh-20160630t173720-20160630t173745-000960-0009b7-001_filter

s1b-iw-grd-hv-20160630t173720-20160630t173745-000960-0009b7-002_filter

s1b-iw-grd-hh-20160630t173720-20160630t173745-000960-0009b7-001_winddir

s1b-iw-grd-hv-20160630t173720-20160630t173745-000960-0009b7-002_winddir