undef

s1a-iw-grd-hv-20140526t175139-20140526t175204-000772-000bb6-002_filter

s1a-iw-grd-hh-20140526t175139-20140526t175204-000772-000bb6-001_filter

s1a-iw-grd-hh-20140526t175139-20140526t175204-000772-000bb6-001_winddir

s1a-iw-grd-hv-20140526t175139-20140526t175204-000772-000bb6-002_winddir