undef

s1b-iw-grd-hh-20160929t062618-20160929t062647-002280-003d8f-001_filter

s1b-iw-grd-hv-20160929t062618-20160929t062647-002280-003d8f-002_filter

s1b-iw-grd-hv-20160929t062618-20160929t062647-002280-003d8f-002_winddir

s1b-iw-grd-hh-20160929t062618-20160929t062647-002280-003d8f-001_winddir